1.
Pleistocene
–
The Pleistocene is the geological epoch which lasted from about 2,588,000 to 11,700 years ago, spanning the worlds most recent period of repeated glaciations. The end of the Pleistocene corresponds with the end of the last glacial period, the Pleistocene is the first epoch of the Quaternary Period or sixth epoch of the Cenozoic Era. In the ICS timescale, the Pleistocene is divided into four stages or ages, all of these stages were defined in southern Europe. In addition to this subdivision, various regional subdivisions are often used. Charles Lyell introduced the term pleistocene in 1839 to describe strata in Sicily that had at least 70% of their molluscan fauna still living today and this distinguished it from the older Pliocene Epoch, which Lyell had originally thought to be the youngest fossil rock layer. The Pleistocene has been dated from 2.588 million to 11,700 years before present and it covers most of the latest period of repeated glaciation, up to and including the Younger Dryas cold spell. The end of the Younger Dryas has been dated to about 9640 BC, the IUGS has yet to approve a type section, Global Boundary Stratotype Section and Point, for the upper Pleistocene/Holocene boundary. The proposed section is the North Greenland Ice Core Project ice core 75°06 N 42°18 W, the lower boundary of the Pleistocene Series is formally defined magnetostratigraphically as the base of the Matuyama chronozone, isotopic stage 103. Above this point there are notable extinctions of the calcareous nanofossils, Discoaster pentaradiatus, the Pleistocene covers the recent period of repeated glaciations. The name Plio-Pleistocene has, in the past, been used to mean the last ice age. The revised definition of the Quaternary, by pushing back the date of the Pleistocene to 2.58 Ma. Pleistocene climate was marked by repeated glacial cycles in which continental glaciers pushed to the 40th parallel in some places and it is estimated that, at maximum glacial extent, 30% of the Earths surface was covered by ice. In addition, a zone of permafrost stretched southward from the edge of the sheet, a few hundred kilometres in North America. The mean annual temperature at the edge of the ice was −6 °C, during interglacial times, such as at present, drowned coastlines were common, mitigated by isostatic or other emergent motion of some regions. The effects of glaciation were global, antarctica was ice-bound throughout the Pleistocene as well as the preceding Pliocene. The Andes were covered in the south by the Patagonian ice cap, there were glaciers in New Zealand and Tasmania. The current decaying glaciers of Mount Kenya, Mount Kilimanjaro, glaciers existed in the mountains of Ethiopia and to the west in the Atlas mountains. In the northern hemisphere, many glaciers fused into one, the Cordilleran ice sheet covered the North American northwest, the east was covered by the Laurentide
Pleistocene
–
The maximum extent of
glacial ice in the north polar area during the Pleistocene period.
Pleistocene
–
Ice ages as reflected in atmospheric CO 2, stored in bubbles from glacial ice of
Antarctica.
Pleistocene
–
Pleistocene of
Northern Spain showing
woolly mammoth,
cave lions eating a
reindeer,
tarpans, and
woolly rhinoceros.
Pleistocene
–
Pleistocene of
South America showing
Megatherium and two
Glyptodon.
2.
Conservation status
–
The conservation status of a group of organisms indicates whether the group still exists and how likely the group is to become extinct in the near future. Various systems of conservation status exist and are in use at international, multi-country, the IUCN Red List of Threatened Species is the best known worldwide conservation status listing and ranking system. Also included are species that have gone extinct since 500 AD, when discussing the IUCN Red List, the official term threatened is a grouping of three categories, critically endangered, endangered, and vulnerable. Widespread and abundant taxa are included in this category, Data deficient – Not enough data to make an assessment of its risk of extinction Not evaluated – Has not yet been evaluated against the criteria. The Convention on International Trade in Endangered Species of Wild Fauna and Flora aims to ensure that trade in specimens of wild animals. Many countries require CITES permits when importing plants and animals listed on CITES, in the European Union, the Birds and Habitats Directives are the legal instruments that evaluate the conservation status within the EU of species and habitats. NatureServe conservation status focuses on Latin America, United States, Canada, and it has been developed by scientists from NatureServe, The Nature Conservancy, and the network of natural heritage programs and data centers. It is increasingly integrated with the IUCN Red List system and its categories for species include, presumed extinct, possibly extinct, critically imperiled, imperiled, vulnerable, apparently secure, and secure. The system also allows ambiguous or uncertain ranks including inexact numeric ranks, NatureServe adds a qualifier for captive or cultivated only, which has a similar meaning to the IUCN Red List extinct in the wild status. The Red Data Book of the Russian Federation is used within the Russian Federation, in Australia, the Environment Protection and Biodiversity Conservation Act 1999 describes lists of threatened species, ecological communities and threatening processes. The categories resemble those of the 1994 IUCN Red List Categories & Criteria, prior to the EPBC Act, a simpler classification system was used by the Endangered Species Protection Act 1992. Some state and territory governments also have their own systems for conservation status, in Belgium, the Flemish Research Institute for Nature and Forest publishes an online set of more than 150 nature indicators in Dutch. In Canada, the Committee on the Status of Endangered Wildlife in Canada is a group of experts that assesses and designates which wild species are in danger of disappearing from Canada. Under the Species at Risk Act, it is up to the federal government, in China, the State, provinces and some counties have determined their key protected wildlife species. There is the China red data book, in Finland, a large number of species are protected under the Nature Conservation Act, and through the EU Habitats Directive and EU Birds Directive. In Germany, the Federal Agency for Nature Conservation publishes red lists of endangered species, india has the Wild Life Protection Act,1972, Amended 2003 and the Biological Diversity Act,2002. In Japan, the Ministry of Environment publishes a Threatened Wildlife of Japan Red Data Book, in the Netherlands, the Dutch Ministry of Agriculture, Nature and Food Quality publishes a list of threatened species, and conservation is enforced by the Nature Conservation Act 1998. Species are also protected through the Wild Birds and Habitats Directives, in New Zealand, the Department of Conservation publishes the New Zealand Threat Classification System lists
Conservation status
–
by
IUCN Red List category
Conservation status
–
IUCN Red List
Conservation status
–
Conservation biology
3.
Vulnerable species
–
Vulnerability is mainly caused by habitat loss or destruction of the species home. Vulnerable habitat or species are monitored and can become increasingly threatened, some species listed as vulnerable may be common in captivity, an example being the military macaw. There are currently 5196 animals and 6789 plants classified as vulnerable, compared with 1998 levels of 2815 and 3222, practices such as Cryoconservation of animal genetic resources have been enforced in efforts to conserve vulnerable breeds of livestock specifically. The International Union for Conservation of Nature uses several criteria to enter species in this category, a reduction of at least 20%, projected or suspected to be met within the next ten years or three generations, whichever is the longer, based on any of, or above. Population is characterised by a restriction in its area of occupancy or in the number of locations. E) Quantitative analysis showing the probability of extinction in the wild is at least 10% within 100 years
Vulnerable species
–
by
IUCN Red List category
Vulnerable species
–
IUCN Red List
Vulnerable species
–
By
region
Vulnerable species
4.
IUCN Red List
–
The IUCN Red List of Threatened Species, founded in 1964, is the worlds most comprehensive inventory of the global conservation status of biological species. The International Union for Conservation of Nature is the main authority on the conservation status of species. A series of Regional Red Lists are produced by countries or organizations, the IUCN Red List is set upon precise criteria to evaluate the extinction risk of thousands of species and subspecies. These criteria are relevant to all species and all regions of the world, the aim is to convey the urgency of conservation issues to the public and policy makers, as well as help the international community to try to reduce species extinction. Major species assessors include BirdLife International, the Institute of Zoology, the World Conservation Monitoring Centre, collectively, assessments by these organizations and groups account for nearly half the species on the Red List. The IUCN aims to have the category of every species re-evaluated every five years if possible, the 1964 IUCN Red List of Threatened Plants used the older pre-criteria Red List assessment system. Plants listed may not, therefore, appear in the current Red List, IUCN advise that is best to check both the online Red List and the 1997 plants Red List publication. The 2006 Red List, released on 4 May 2006 evaluated 40,168 species as a whole, plus an additional 2,160 subspecies, varieties, aquatic stocks, on 12 September 2007, the World Conservation Union released the 2007 IUCN Red List of Threatened Species. Russ Mittermeier, chief of Swiss-based IUCNs Primate Specialist Group, stated that 16,306 species are endangered with extinction,188 more than in 2006, the Red List includes the Sumatran orangutan in the Critically Endangered category and the Bornean orangutan in the Endangered category. The study shows at least 1,141 of the 5,487 mammals on Earth are known to be threatened with extinction, and 836 are listed as Data Deficient. The Red List of 2012 was released 19 July 2012 at Rio+20 Earth Summit, nearly 2,000 species were added, the IUCN assessed a total of 63,837 species which revealed 19,817 are threatened with extinction. With 3,947 described as endangered and 5,766 as endangered. At threat are 41% of amphibian species, 33% of reef-building corals, 30% of conifers, 25% of mammals, the IUCN Red List has listed 132 species of plants and animals from India as Critically Endangered. Extinct – No known individuals remaining, extinct in the wild – Known only to survive in captivity, or as a naturalized population outside its historic range. Critically endangered – Extremely high risk of extinction in the wild, Endangered – High risk of extinction in the wild. Vulnerable – High risk of endangerment in the wild, near threatened – Likely to become endangered in the near future. Does not qualify for a more at-risk category, widespread and abundant taxa are included in this category. Data deficient – Not enough data to make an assessment of its risk of extinction, Not evaluated – Has not yet been evaluated against the criteria
IUCN Red List
–
by
IUCN Red List category
IUCN Red List
–
The IUCN Red List of Threatened Species
IUCN Red List
–
IUCN Red List
IUCN Red List
–
By
region
5.
Taxonomy (biology)
–
Taxonomy is the science of defining groups of biological organisms on the basis of shared characteristics and giving names to those groups. The exact definition of taxonomy varies from source to source, but the core of the remains, the conception, naming. There is some disagreement as to whether biological nomenclature is considered a part of taxonomy, the broadest meaning of taxonomy is used here. The word taxonomy was introduced in 1813 by Candolle, in his Théorie élémentaire de la botanique, the term alpha taxonomy is primarily used today to refer to the discipline of finding, describing, and naming taxa, particularly species. In earlier literature, the term had a different meaning, referring to morphological taxonomy, ideals can, it may be said, never be completely realized. They have, however, a value of acting as permanent stimulants. Some of us please ourselves by thinking we are now groping in a beta taxonomy, turrill thus explicitly excludes from alpha taxonomy various areas of study that he includes within taxonomy as a whole, such as ecology, physiology, genetics, and cytology. He further excludes phylogenetic reconstruction from alpha taxonomy, thus, Ernst Mayr in 1968 defined beta taxonomy as the classification of ranks higher than species. This activity is what the term denotes, it is also referred to as beta taxonomy. How species should be defined in a group of organisms gives rise to practical and theoretical problems that are referred to as the species problem. The scientific work of deciding how to define species has been called microtaxonomy, by extension, macrotaxonomy is the study of groups at higher taxonomic ranks, from subgenus and above only, than species. While some descriptions of taxonomic history attempt to date taxonomy to ancient civilizations, earlier works were primarily descriptive, and focused on plants that were useful in agriculture or medicine. There are a number of stages in scientific thinking. Early taxonomy was based on criteria, the so-called artificial systems. Later came systems based on a complete consideration of the characteristics of taxa, referred to as natural systems, such as those of de Jussieu, de Candolle and Bentham. The publication of Charles Darwins Origin of Species led to new ways of thinking about classification based on evolutionary relationships and this was the concept of phyletic systems, from 1883 onwards. This approach was typified by those of Eichler and Engler, the advent of molecular genetics and statistical methodology allowed the creation of the modern era of phylogenetic systems based on cladistics, rather than morphology alone. Taxonomy has been called the worlds oldest profession, and naming and classifying our surroundings has likely been taking place as long as mankind has been able to communicate
Taxonomy (biology)
–
Title page of
Systema Naturae, Leiden, 1735
Taxonomy (biology)
–
Evolution of the
vertebrates at class level, width of spindles indicating number of families. Spindle diagrams are typical for
Evolutionary taxonomy
Taxonomy (biology)
–
The same relationship, expressed as a
cladogram typical for
cladistics
Taxonomy (biology)
–
Type specimen for
Nepenthes smilesii, a tropical
pitcher plant.
6.
Animal
–
Animals are multicellular, eukaryotic organisms of the kingdom Animalia. The animal kingdom emerged as a clade within Apoikozoa as the group to the choanoflagellates. Animals are motile, meaning they can move spontaneously and independently at some point in their lives and their body plan eventually becomes fixed as they develop, although some undergo a process of metamorphosis later in their lives. All animals are heterotrophs, they must ingest other organisms or their products for sustenance, most known animal phyla appeared in the fossil record as marine species during the Cambrian explosion, about 542 million years ago. Animals can be divided broadly into vertebrates and invertebrates, vertebrates have a backbone or spine, and amount to less than five percent of all described animal species. They include fish, amphibians, reptiles, birds and mammals, the remaining animals are the invertebrates, which lack a backbone. These include molluscs, arthropods, annelids, nematodes, flatworms, cnidarians, ctenophores, the study of animals is called zoology. The word animal comes from the Latin animalis, meaning having breath, the biological definition of the word refers to all members of the kingdom Animalia, encompassing creatures as diverse as sponges, jellyfish, insects, and humans. Aristotle divided the world between animals and plants, and this was followed by Carl Linnaeus, in the first hierarchical classification. In Linnaeuss original scheme, the animals were one of three kingdoms, divided into the classes of Vermes, Insecta, Pisces, Amphibia, Aves, and Mammalia. Since then the last four have all been subsumed into a single phylum, in 1874, Ernst Haeckel divided the animal kingdom into two subkingdoms, Metazoa and Protozoa. The protozoa were later moved to the kingdom Protista, leaving only the metazoa, thus Metazoa is now considered a synonym of Animalia. Animals have several characteristics that set apart from other living things. Animals are eukaryotic and multicellular, which separates them from bacteria and they are heterotrophic, generally digesting food in an internal chamber, which separates them from plants and algae. They are also distinguished from plants, algae, and fungi by lacking cell walls. All animals are motile, if only at life stages. In most animals, embryos pass through a stage, which is a characteristic exclusive to animals. With a few exceptions, most notably the sponges and Placozoa and these include muscles, which are able to contract and control locomotion, and nerve tissues, which send and process signals
Animal
–
Carl Linnaeus, known as the father of modern
taxonomy
Animal
–
Had'n
Animal
–
The use of
love darts by the land snail
Monachoides vicinus is a form of
sexual selection
Animal
–
A
newt lung cell stained with
fluorescent dyes undergoing the early
anaphase stage of
mitosis
7.
Chordate
–
Chordates are deuterostomes, as during the embryo development stage the anus forms before the mouth. They are also bilaterally symmetric coelomates, in the case of vertebrate chordates, the notochord is usually replaced by a vertebral column during development, and they may have body plans organized via segmentation. There are also additional extinct taxa, the Vertebrata are sometimes considered as a subgroup of the clade Craniata, consisting of chordates with a skull, the Craniata and Tunicata compose the clade Olfactores. Of the more than 65,000 living species of chordates, the worlds largest and fastest animals, the blue whale and peregrine falcon respectively, are chordates, as are humans. Fossil chordates are known from at least as early as the Cambrian explosion, Hemichordata, which includes the acorn worms, has been presented as a fourth chordate subphylum, but it now is usually treated as a separate phylum. The Hemichordata, along with the Echinodermata, form the Ambulacraria, the Chordata and Ambulacraria form the superphylum Deuterostomia, composed of the deuterostomes. Attempts to work out the relationships of the chordates have produced several hypotheses. All of the earliest chordate fossils have found in the Early Cambrian Chengjiang fauna. Because the fossil record of early chordates is poor, only molecular phylogenetics offers a prospect of dating their emergence. However, the use of molecular phylogenetics for dating evolutionary transitions is controversial and it has also proved difficult to produce a detailed classification within the living chordates. Attempts to produce family trees shows that many of the traditional classes are paraphyletic. While this has been known since the 19th century, an insistence on only monophyletic taxa has resulted in vertebrate classification being in a state of flux. Although the name Chordata is attributed to William Bateson, it was already in prevalent use by 1880, ernst Haeckel described a taxon comprising tunicates, cephalochordates, and vertebrates in 1866. Though he used the German vernacular form, it is allowed under the ICZN code because of its subsequent latinization, among the vertebrate sub-group of chordates the notochord develops into the spine, and in wholly aquatic species this helps the animal to swim by flexing its tail. In fish and other vertebrates, this develops into the spinal cord, the pharynx is the part of the throat immediately behind the mouth. In fish, the slits are modified to form gills, a muscular tail that extends backwards behind the anus. This is a groove in the wall of the pharynx. In filter-feeding species it produces mucus to gather food particles, which helps in transporting food to the esophagus and it also stores iodine, and may be a precursor of the vertebrate thyroid gland
Chordate
Chordate
–
Craniate:
Hagfish
Chordate
–
Tunicates: sea squirts
Chordate
–
Cephalochordate:
Lancelet
8.
Mammal
–
Mammals are any vertebrates within the class Mammalia, a clade of endothermic amniotes distinguished from reptiles by the possession of a neocortex, hair, three middle ear bones and mammary glands. All female mammals nurse their young with milk, secreted from the mammary glands, Mammals include the largest animals on the planet, the great whales. The basic body type is a quadruped, but some mammals are adapted for life at sea, in the air, in trees. The largest group of mammals, the placentals, have a placenta, Mammals range in size from the 30–40 mm bumblebee bat to the 30-meter blue whale. With the exception of the five species of monotreme, all modern mammals give birth to live young, most mammals, including the six most species-rich orders, belong to the placental group. The largest orders are the rodents, bats and Soricomorpha, the next three biggest orders, depending on the biological classification scheme used, are the Primates, the Cetartiodactyla, and the Carnivora. Living mammals are divided into the Yinotheria and Theriiformes There are around 5450 species of mammal, in some classifications, extant mammals are divided into two subclasses, the Prototheria, that is, the order Monotremata, and the Theria, or the infraclasses Metatheria and Eutheria. The marsupials constitute the group of the Metatheria, and include all living metatherians as well as many extinct ones. Much of the changes reflect the advances of cladistic analysis and molecular genetics, findings from molecular genetics, for example, have prompted adopting new groups, such as the Afrotheria, and abandoning traditional groups, such as the Insectivora. The mammals represent the only living Synapsida, which together with the Sauropsida form the Amniota clade, the early synapsid mammalian ancestors were sphenacodont pelycosaurs, a group that produced the non-mammalian Dimetrodon. At the end of the Carboniferous period, this group diverged from the line that led to todays reptiles. Some mammals are intelligent, with some possessing large brains, self-awareness, Mammals can communicate and vocalize in several different ways, including the production of ultrasound, scent-marking, alarm signals, singing, and echolocation. Mammals can organize themselves into fission-fusion societies, harems, and hierarchies, most mammals are polygynous, but some can be monogamous or polyandrous. They provided, and continue to provide, power for transport and agriculture, as well as commodities such as meat, dairy products, wool. Mammals are hunted or raced for sport, and are used as model organisms in science, Mammals have been depicted in art since Palaeolithic times, and appear in literature, film, mythology, and religion. Defaunation of mammals is primarily driven by anthropogenic factors, such as poaching and habitat destruction, Mammal classification has been through several iterations since Carl Linnaeus initially defined the class. No classification system is accepted, McKenna & Bell and Wilson & Reader provide useful recent compendiums. Though field work gradually made Simpsons classification outdated, it remains the closest thing to a classification of mammals
Mammal
–
Goat kids will stay with their mother until they are weaned.
Mammal
9.
Carnivora
–
Carnivora is a diverse scrotiferan order that includes over 280 species of placental mammals. Its members are referred to as carnivorans, whereas the word carnivore can refer to any meat-eating organism.9 m in length. Some carnivorans, such as cats and pinnipeds, depend entirely on meat for their nutrition, carnivorans have teeth and claws adapted for catching and eating other animals. Many hunt in packs and are social animals, giving them an advantage over larger prey, carnivorans are split into two suborders, feliforms and caniforms. Carnivorans all share the same arrangement of teeth in which the last upper premolar, carnivorans have had this arrangement for over 60 million years with many adaptions, and these dental adaptions help identify carnivoran species and groupings of species. Carnivorans evolved in North America out of members of the family Miacidae about 42 million years ago and they soon split into cat-like and dog-like forms. Their molecular phylogeny shows the extant Carnivora are a monophyletic group, the last premolar of the upper jaw and first molar of the lower are termed the carnassials or sectorial teeth. These blade-like teeth occlude with an action for shearing and shredding meat. Carnassials are most highly developed in the Felidae and the least developed in the Ursidae, carnivorans have six incisors and two conical canines in each jaw. The only two exceptions to this are the sea otter, which has four incisors in the jaw, and the sloth bear. The number of molars and premolars is variable between species, but all teeth are deeply rooted and are diphyodont. Incisors are retained by carnivorans and the incisor is commonly large. Carnivorans have either four or five digits on each foot, with the first digit on the forepaws, also known as the dew claw, being vestigial in most species and absent in some. Most species are plain in coloration, lacking the flashy spotted or rosetted coats like many species of felids and viverrids have. This is because Canoidea tend to range in the temperate and subarctic biomes, most are terrestrial, although a few species, like procyonids, are arboreal. All families except the Canidae and a few species of Mustelidae are plantigrade, diet is varied and most tend to be omnivorous to some degree, and thus the carnassial teeth are less specialized. Canoidea have more premolars and molars in an elongated skull and this is because these species tend to range in tropical habitats, although a few species do inhabit temperate and subarctic habitats. Many are arboreal or semiarboreal, and the majority are digitigrade, diet tends to be more strictly carnivorous, especially in the family Felidae
Carnivora
Carnivora
–
A
brown bear, showing the sharp teeth and claws characteristic of carnivorans
Carnivora
–
Skull of
Hyaena eximia
Carnivora
–
Carnassials of a
Eurasian wolf
10.
Caniformia
–
Caniformia, or Canoidea, is a suborder within the order Carnivora. They typically possess a long snout and nonretractile claws, the Pinnipedia are also assigned to this group. The center of diversification for Caniformia is North America and northern Eurasia and this contrasts with the feliforms, the center of diversification of which was in Africa and southern Asia. Most members of this group have nonretractile claws and tend to be plantigrade, other traits that separate Caniformia from Feliformia is that caniforms have longer jaws and have more teeth, with less specialized carnassial teeth. They also tend more towards omnivory and opportunistic feeding, while the feliforms are more specialized for eating meat, Caniformia consists of nine extant families, with three extinct families also recognized. The extant families are monophyletic according to molecular analysis. At one time, the Hyaenidae were included, but genetic testing has shown them to belong in Feliformia, terrestrial caniforms in the wild are found on all continents with the exception of Antarctica, while pinnipeds are distributed throughout the worlds oceans. Family Canidae includes wolves, dogs, coyotes, and foxes, the family is currently divided into two major groups, the true dogs, which includes nine genera, and the true foxes with two genera. In addition, two genera are described. About 35 species of extant canids are currently recognized, canids are the most social of all caniforms, sometimes living in packs. The dog is the most diverse of all mammals in terms of body structure variants, Family Ursidae is the largest of all the land caniforms. Eight species are recognized, divided into five genera and they range from the large polar bear to the small sun bear and from the endangered giant panda to the very common black bear. Common characteristics of modern bears include a body with stocky legs, a long snout, shaggy hair, plantigrade paws with five nonretractile claws. Most bears are omnivorous, with varied diets that include both plants and animals. The polar bear is the most carnivorous of bears due to the climate in which it lives. The sloth bear has some adaptations for ant and termite eating, with a snout, powerful claws. It is found in the Himalayas, including southern China, Nepal, Bhutan, India, fossil species of the family are also found in North America. Family Mephitidae was once classified as mustelids, but are now recognized as a lineage in their own right, the 12 species of skunks are divided into four genera, Mephitis, Spilogale, Mydaus and Conepatus
Caniformia
Caniformia
–
Brown bear, the largest terrestrial caniform along with the
polar bear
Caniformia
–
The smallest caniform is the
least weasel
Caniformia
–
Miacis is the earliest known member of the order
Carnivora.
11.
Pinniped
–
Pinnipeds, commonly known as seals, are a widely distributed and diverse clade of carnivorous, fin-footed, semiaquatic marine mammals. They comprise the extant families Odobenidae, Otariidae, and Phocidae, there are 33 extant species of pinnipeds, and more than 50 extinct species have been described from fossils. While seals were historically thought to have descended from two lines, molecular evidence supports them as a monophyletic lineage. Pinnipeds belong to the order Carnivora and their closest living relatives are bears and musteloids, Seals range in size from the 1 m and 45 kg Baikal seal to the 5 m and 3,200 kg southern elephant seal, which is also the largest carnivoran. They have streamlined bodies and four limbs that are modified into flippers, though not as fast in the water as dolphins, seals are more flexible and agile. Otariids use their front limbs primarily to themselves through the water, while phocids. Otariids and walruses have hind limbs that can be pulled under the body, by comparison, terrestrial locomotion by phocids is more cumbersome. Otariids have visible ears, while phocids and walruses lack these. Pinnipeds have well-developed senses—their eyesight and hearing are adapted for both air and water, and they have a tactile system in their whiskers or vibrissae. Some species are adapted for diving to great depths. They have a layer of fat, or blubber, under the skin to keep warm in the cold water, although pinnipeds are widespread, most species prefer the colder waters of the Northern and Southern Hemispheres. They spend most of their lives in the water, but come ashore to mate, give birth, molt or escape predators, like sharks. They feed largely on fish and marine invertebrates, but a few, like the seal, feed on large vertebrates, such as penguins. Walruses are specialized for feeding on bottom-dwelling mollusks, male pinnipeds typically mate with more than one female, although the degree of polygyny varies with the species. The males of land-breeding species tend to mate with a number of females than those of ice- or water-breeding species. Male pinniped strategies for reproductive success vary between defending females, defending territories that attract females and performing ritual displays or lek mating, pups are typically born in the spring and summer months and females bear almost all the responsibility for raising them. Mothers of some species fast and nurse their young for a short period of time while others take foraging trips at sea between nursing bouts. Walruses are known to nurse their young while at sea, Seals produce a number of vocalizations, notably the barks of California sea lions, the gong-like calls of walruses and the complex songs of Weddell seals
Pinniped
Pinniped
Pinniped
–
Restoration of Puijila darwini
Pinniped
–
Fossil of Enaliarctos
12.
Odobenidae
–
Odobenidae is a family of pinnipeds. The only living species is the walrus, in the past, however, the group was much more diverse, and includes more than ten fossil genera. All genera, except Odobenus, are extinct, william F. Perrin, Bernd Würsig, J. G. M. Thewissen Marine Mammals, Evolutionary Biology, 2nd ed
Odobenidae
–
Odobenidae Temporal range:
Middle Miocene to present
13.
Mathurin Jacques Brisson
–
Mathurin Jacques Brisson was a French zoologist and natural philosopher. The earlier part of his life was spent in the pursuit of natural history, his works in this field included Le Règne animal. As a young man, he was a disciple and assistant of R. A. F. Reaumur, for a period of time he was an instructor of physical sciences and natural history to the family of the monarch. He held the chair of physics at the College of Navarre, a significant work involving the specific weight of bodies was his Pesanteur Spécifique des Corps. In his investigations of electricity, Brisson was opposed to the theories of Priestley and he died at Croissy-sur-Seine near Paris. Regnum animale in classes IX distributum sive Synopsis methodica, ornithologia, sive Synopsis methodica sistens avium divisionem in ordines, sectiones, genera, species, ipsarumque varietates. Bauche, Paris, Leiden 1760–63, with engraved illustrations by François-Nicolas Martinet, supplementum Ornithologiæ sive Citationes, descriptionesque antea omissæ & species de novo adjectæ, ad suaquaque genera redactæ. Lettres de deux Espagnols sur les manufactures, observations sur les nouvelles découvertes aërostatiques. Traité élémentaire ou Principes de physique, trattato elementare ovvero Principi di fisica. Suplemento al Diccionario universal de física, Principes élémentaires de lhistoire naturelle et chymique des substances minérales. Anfangsgründe der Naturgeschichte und Chemie der Mineralien, instruction sur les nouveaux poids et mesures. Elements of the history and chymical analysis of mineral substances. Ritchie, Walker, Vernor & Hood, London 1800, tratado elemental ó principios de física. This article incorporates text from a now in the public domain, Chisholm, Hugh, ed. Brisson. Dictionnaire raisonné de physique, 2nd éd, Planches - Linda Hall Library
Mathurin Jacques Brisson
–
Mathurin Jacques Brisson
14.
Binomial nomenclature
–
Such a name is called a binomial name, a binomen, binominal name or a scientific name, more informally it is also called a Latin name. The first part of the name identifies the genus to which the species belongs, for example, humans belong to the genus Homo and within this genus to the species Homo sapiens. The formal introduction of system of naming species is credited to Carl Linnaeus. But Gaspard Bauhin, in as early as 1623, had introduced in his book Pinax theatri botanici many names of genera that were adopted by Linnaeus. Although the general principles underlying binomial nomenclature are common to these two codes, there are differences, both in the terminology they use and in their precise rules. Similarly, both parts are italicized when a binomial name occurs in normal text, thus the binomial name of the annual phlox is now written as Phlox drummondii. In scientific works, the authority for a name is usually given, at least when it is first mentioned. In zoology Patella vulgata Linnaeus,1758, the original name given by Linnaeus was Fringilla domestica, the parentheses indicate that the species is now considered to belong in a different genus. The ICZN does not require that the name of the person who changed the genus be given, nor the date on which the change was made, in botany Amaranthus retroflexus L. – L. is the standard abbreviation used in botany for Linnaeus. – Linnaeus first named this bluebell species Scilla italica, Rothmaler transferred it to the genus Hyacinthoides, the ICN does not require that the dates of either publication be specified. Prior to the adoption of the binomial system of naming species. Together they formed a system of polynomial nomenclature and these names had two separate functions. First, to designate or label the species, and second, to be a diagnosis or description, such polynomial names may sometimes look like binomials, but are significantly different. For example, Gerards herbal describes various kinds of spiderwort, The first is called Phalangium ramosum, Branched Spiderwort, is aptly termed Phalangium Ephemerum Virginianum, Soon-Fading Spiderwort of Virginia. The Latin phrases are short descriptions, rather than identifying labels, the Bauhins, in particular Caspar Bauhin, took some important steps towards the binomial system, by pruning the Latin descriptions, in many cases to two words. The adoption by biologists of a system of binomial nomenclature is due to Swedish botanist and physician Carl von Linné. It was in his 1753 Species Plantarum that he first began using a one-word trivial name together with a generic name in a system of binomial nomenclature. This trivial name is what is now known as an epithet or specific name
Binomial nomenclature
–
Carl Linnaeus (1707–1778), a Swedish botanist, invented the modern system of binomial nomenclature.
15.
Carl Linnaeus
–
Carl Linnaeus, also known after his ennoblement as Carl von Linné, was a Swedish botanist, physician, and zoologist, who formalised the modern system of naming organisms called binomial nomenclature. He is known by the father of modern taxonomy. Many of his writings were in Latin, and his name is rendered in Latin as Carolus Linnæus, Linnaeus was born in the countryside of Småland, in southern Sweden. He received most of his education at Uppsala University. He lived abroad between 1735 and 1738, where he studied and also published a first edition of his Systema Naturae in the Netherlands and he then returned to Sweden, where he became professor of medicine and botany at Uppsala. In the 1740s, he was sent on journeys through Sweden to find and classify plants. In the 1750s and 1760s, he continued to collect and classify animals, plants, and minerals, at the time of his death, he was one of the most acclaimed scientists in Europe. The philosopher Jean-Jacques Rousseau sent him the message, Tell him I know no man on earth. The German writer Johann Wolfgang von Goethe wrote, With the exception of Shakespeare and Spinoza, Swedish author August Strindberg wrote, Linnaeus was in reality a poet who happened to become a naturalist. Among other compliments, Linnaeus has been called Princeps botanicorum, The Pliny of the North and he is also considered as one of the founders of modern ecology. In botany, the abbreviation used to indicate Linnaeus as the authority for species names is L. In older publications, sometimes the abbreviation Linn. is found, Linnæus was born in the village of Råshult in Småland, Sweden, on 23 May 1707. He was the first child of Nicolaus Ingemarsson and Christina Brodersonia and his siblings were Anna Maria Linnæa, Sofia Juliana Linnæa, Samuel Linnæus, and Emerentia Linnæa. One of a line of peasants and priests, Nils was an amateur botanist, a Lutheran minister. Christina was the daughter of the rector of Stenbrohult, Samuel Brodersonius, a year after Linnæus birth, his grandfather Samuel Brodersonius died, and his father Nils became the rector of Stenbrohult. The family moved into the rectory from the curates house, even in his early years, Linnæus seemed to have a liking for plants, flowers in particular. Whenever he was upset, he was given a flower, which calmed him. Nils spent much time in his garden and often showed flowers to Linnaeus, soon Linnæus was given his own patch of earth where he could grow plants
Carl Linnaeus
–
Carl von Linné,
Alexander Roslin, 1775. Oil painting in the portrait collection at
Gripsholm Castle
Carl Linnaeus
–
The
coat of arms of Carl von Linné.
Carl Linnaeus
–
Birthplace of Linnæus at
Råshult
Carl Linnaeus
–
Statue of Linnaeus as a University student in
Lund
16.
10th edition of Systema Naturae
–
The 10th edition of Systema Naturae is a book written by Carl Linnaeus and published in two volumes in 1758 and 1759, which marks the starting point of zoological nomenclature. In it, Linnaeus introduced binomial nomenclature for animals, something he had already done for plants in his 1753 publication of Species Plantarum, before 1758, most biological catalogues had used polynomial names for the taxa included, including earlier editions of Systema Naturae. The first work to consistently apply binomial nomenclature across the kingdom was the 10th edition of Systema Naturae. Names published before that date are unavailable, even if they would otherwise satisfy the rules, during Linnaeus lifetime, Systema Naturae was under continuous revision. The Animal Kingdom, Animals enjoy sensation by means of an organization, animated by a medullary substance, perception by nerves. They have members for the different purposes of life, organs for their different senses and they all originate from an egg. Their external and internal structure, their anatomy, habits, instincts. The list has been broken down into the six classes Linnaeus described for animals, Mammalia, Aves, Amphibia, Pisces, Insecta. These classes were created by studying the internal anatomy, as seen in his key. Warm, red blood Viviparous, Mammalia Oviparous, Aves Heart with 1 auricle,1 ventricle, cold, red blood Lungs voluntary, Amphibia External gills, Pisces Heart with 1 auricle,0 ventricles. Linnaeus described mammals as, Animals that suckle their young by means of lactiferous teats, in external and internal structure they resemble man, most of them are quadrupeds, and with man, their natural enemy, inhabit the surface of the Earth. The largest, though fewest in number, inhabit the ocean and they are areal, vocal, swift and light, and destitute of external ears, lips, teeth, scrotum, womb, bladder, epiglottis, corpus callosum and its arch, and diaphragm. They breathe by means of gills, which are united by a bony arch, swim by means of radiate fins. Many of them are without a head, and most of them without feet. They are principally distinguished by their tentacles, by the Ancients they were not improperly called imperfect animals, as being destitute of ears, nose, head, eyes and legs, and are therefore totally distinct from Insects. In addition to repeating the species he had listed in his Species Plantarum. The species from Species Plantarum were numbered sequentially, while the new species were labelled with letters, new plant species described in the 10th edition of Systema Naturae include, The original 1758 Systema Naturae Linnaeus 1758 Classification of Animals on the Taxonomicon
10th edition of Systema Naturae
–
Title page of the 10th edition of Systema Naturae
10th edition of Systema Naturae
–
An oil-painting of Carl Linnaeus by
Alexander Roslin in 1775
10th edition of Systema Naturae
–
The
Barbary macaque was included in the 10th edition as Simia sylvanus.
10th edition of Systema Naturae
–
The
snowy owl was included in the 10th edition as Strix scandiaca.
17.
Marine mammal
–
Marine mammals are aquatic mammals that rely on the ocean and other marine ecosystems for their existence. They include animals such as seals, whales, manatees, sea otters and they do not represent a distinct taxon or systematic grouping, but rather have a polyphyletic relation due to convergent evolution. They are also unified by their reliance on the environment for feeding. Marine mammal adaptation to an aquatic lifestyle vary considerably between species, both cetaceans and sirenians are fully aquatic and therefore are obligate water dwellers. Seals and sea-lions are semiaquatic, they spend the majority of their time in the water, in contrast, both otters and the polar bear are much less adapted to aquatic living. Their diet varies considerably as well, some may eat zooplankton, others may eat fish, squid, shellfish, sea-grass and this role in maintaining ecosystems makes them of particular concern as 23% of marine mammal species are currently threatened. Marine mammals were first hunted by aboriginal peoples for food and other resources, many were also the target for commercial industry, leading to a sharp decline in all populations of exploited species, such as whales and seals. Commercial hunting lead to the extinction of †Stellers sea cow and the monk seal. Other than hunting, marine mammals can be killed as bycatch from fisheries, increased ocean traffic causes collisions between fast ocean vessels and large marine mammals. Habitat degradation also threatens marine mammals and their ability to find, noise pollution, for example, may adversely affect echolocating mammals, and the ongoing effects of global warming degrade arctic environments. Marine mammals form a group of 129 species that rely on the ocean for their existence. They do not represent a taxon or systematic grouping. They are also unified by their reliance on the environment for feeding. The level of dependence on the environment for existence varies considerably with species. For example, dolphins and whales are completely dependent on the environment for all stages of their life, seals feed in the ocean but breed on land. Twenty three percent of mammal species are threatened. Five of these lineages are extinct, despite the diversity in morphology seen between groups, improving foraging efficiency has been the main driver in the evolution in these lineages. Today, fully aquatic marine mammals belong to one of two orders, Cetartiodactyla or Sirenia, based on molecular and morphological research, the cetaceans genetically and morphologically fall firmly within the Artiodactyla
Marine mammal
–
A
humpback whale (Megaptera novaeangliae), a member of order
Cetacea
Marine mammal
–
A
leopard seal (Hydrurga leptonyx), a member of suborder
Pinnipedia of order
Carnivora
Marine mammal
–
A
polar bear (Ursus maritimus), a member of family
Ursidae
Marine mammal
–
A
sea otter (Enhydra lutris), a member of family
Mustelidae
18.
North Pole
–
The North Pole, also known as the Geographic North Pole or Terrestrial North Pole, is defined as the point in the Northern Hemisphere where the Earths axis of rotation meets its surface. The North Pole is the northernmost point on the Earth, lying diametrically opposite the South Pole and it defines geodetic latitude 90° North, as well as the direction of true north. At the North Pole all directions point south, all lines of longitude converge there, along tight latitude circles, counterclockwise is east and clockwise is west. The North Pole is at the center of the Northern Hemisphere, while the South Pole lies on a continental land mass, the North Pole is located in the middle of the Arctic Ocean amid waters that are almost permanently covered with constantly shifting sea ice. This makes it impractical to construct a permanent station at the North Pole, however, the Soviet Union, and later Russia, constructed a number of manned drifting stations on a generally annual basis since 1937, some of which have passed over or very close to the Pole. Since 2002, the Russians have also established a base, Barneo. This operates for a few weeks during early spring, studies in the 2000s predicted that the North Pole may become seasonally ice-free because of Arctic ice shrinkage, with timescales varying from 2016 to the late 21st century or later. The sea depth at the North Pole has been measured at 4,261 m by the Russian Mir submersible in 2007 and at 4,087 m by USS Nautilus in 1958. The nearest land is said to be Kaffeklubben Island, off the northern coast of Greenland about 700 km away. The nearest permanently inhabited place is Alert in the Qikiqtaaluk Region, Nunavut, Canada, around the beginning of the 20th century astronomers noticed a small apparent variation of latitude, as determined for a fixed point on Earth from the observation of stars. Part of this variation could be attributed to a wandering of the Pole across the Earths surface, the wandering has several periodic components and an irregular component. The component with a period of about 435 days is identified with the eight-month wandering predicted by Euler and is now called the Chandler wobble after its discoverer and it is desirable to tie the system of Earth coordinates to fixed landforms. Of course, given plate tectonics and isostasy, there is no system in all geographic features are fixed. Yet the International Earth Rotation and Reference Systems Service and the International Astronomical Union have defined a framework called the International Terrestrial Reference System. As early as the 16th century, many eminent people correctly believed that the North Pole was in a sea and it was therefore hoped that passage could be found through ice floes at favorable times of the year. Several expeditions set out to find the way, generally with whaling ships, one of the earliest expeditions to set out with the explicit intention of reaching the North Pole was that of British naval officer William Edward Parry, who in 1827 reached latitude 82°45′ North. In 1871 the Polaris expedition, a US attempt on the Pole led by Charles Francis Hall, another British Royal Navy attempt on the pole, part of the British Arctic Expedition, by Commander Albert H. Markham reached a then-record 83°2026 North in May 1876 before turning back. An 1879–1881 expedition commanded by US naval officer George W. DeLong ended tragically when their ship, over half the crew, including DeLong, were lost
North Pole
–
North Pole scenery
North Pole
–
An
Azimuthal projection showing the Arctic Ocean and the North Pole. The map also shows the
75th parallel north and
60th parallel north.
North Pole
–
Gerardus Mercator 's map of the North Pole from 1595
North Pole
–
C.G. Zorgdragers map of the North Pole from 1720
19.
Arctic Ocean
–
The Arctic Ocean is the smallest and shallowest of the worlds five major oceans. Alternatively, the Arctic Ocean can be seen as the northernmost part of the all-encompassing World Ocean, located mostly in the Arctic north polar region in the middle of the Northern Hemisphere, the Arctic Ocean is almost completely surrounded by Eurasia and North America. It is partly covered by sea ice throughout the year and almost completely in winter, the summer shrinking of the ice has been quoted at 50%. The US National Snow and Ice Data Center uses satellite data to provide a record of Arctic sea ice cover. The Arctic may become ice free for the first time in human history within a few years or by 2040, for much of European history, the north polar regions remained largely unexplored and their geography conjectural. He was probably describing loose sea ice known today as growlers or bergy bits, his Thule was probably Norway, early cartographers were unsure whether to draw the region around the North Pole as land or water. The makers of navigational charts, more conservative than some of the more fanciful cartographers, tended to leave the region blank and this lack of knowledge of what lay north of the shifting barrier of ice gave rise to a number of conjectures. In England and other European nations, the myth of an Open Polar Sea was persistent, john Barrow, longtime Second Secretary of the British Admiralty, promoted exploration of the region from 1818 to 1845 in search of this. In the United States in the 1850s and 1860s, the explorers Elisha Kane, even quite late in the century, the eminent authority Matthew Fontaine Maury included a description of the Open Polar Sea in his textbook The Physical Geography of the Sea. Nevertheless, as all the explorers who travelled closer and closer to the reported, the polar ice cap is quite thick. Fridtjof Nansen was the first to make a crossing of the Arctic Ocean. The first surface crossing of the ocean was led by Wally Herbert in 1969, in a dog sled expedition from Alaska to Svalbard, with air support. The first nautical transit of the pole was made in 1958 by the submarine USS Nautilus. Since 1937, Soviet and Russian manned drifting ice stations have extensively monitored the Arctic Ocean, scientific settlements were established on the drift ice and carried thousands of kilometres by ice floes. In World War II, the European region of the Arctic Ocean was heavily contested, the Arctic Ocean occupies a roughly circular basin and covers an area of about 14,056,000 km2, almost the size of Antarctica. The coastline is 45,390 km long and it is surrounded by the land masses of Eurasia, North America, Greenland, and by several islands. It is connected to the Pacific Ocean by the Bering Strait and to the Atlantic Ocean through the Greenland Sea, countries bordering the Arctic Ocean are, Russia, Norway, Iceland, Greenland, Canada and the United States. There are several ports and harbours around the Arctic Ocean In Alaska, in Canada, ships may anchor at Churchill in Manitoba, Nanisivik in Nunavut, Tuktoyaktuk or Inuvik in the Northwest territories
Arctic Ocean
–
A
bathymetric /
topographic of the Arctic Ocean and the surrounding lands.
Arctic Ocean
–
Emanuel Bowen 's 1780s map of the Arctic features a "Northern Ocean".
Arctic Ocean
–
Sea cover in the Arctic Ocean, showing the median, 2005 and 2007 coverage
Arctic Ocean
–
Three
polar bears approach
USS Honolulu near the
North Pole.
20.
Subarctic
–
The subarctic is a region in the Northern Hemisphere immediately south of the true Arctic and covering much of Alaska, Canada, Iceland, the north of Scandinavia, Siberia, and the Shetland Islands. Generally, subarctic regions fall between 50°N and 70°N latitude, depending on local climates, monthly temperatures are above 10 °C for at least one and at most three months of the year. Precipitation tends to be low due to the low content of the cold air. Precipitation is typically greater in warmer months, with a summer maximum ranging from moderate in North America to extreme in the Russian Far East, the dominant soil orders are podsols and further north gelisols. Typically, there are only a few species of terrestrial mammals in the subarctic regions, the most important being elk, moose, bears, reindeer. Agriculture is mainly limited to animal husbandry, though in some areas barley can be grown, except for those areas adjacent to warm ocean currents, there is almost always continuous permafrost due to the very cold winters. This means that building in most subarctic regions is difficult and expensive, cities are very few and generally small. Subarctic rail transport exists in Europe and the Norilsk–Dudinka line in northern Siberia. An important consequence is that transportation tends to be restricted to bush planes, helicopters and, in summer, riverboats. Except for a few parts of Europe where the winters are mild due to prevailing wind and ocean current patterns. Even then, the difficulty of transportation ensured that few settlements lasted long—the abandoned, once-thriving cities of the Yukon, Northwest Territories, today, many towns in subarctic Russia are declining precipitously as mines close. In Canada, after the early minerals ran out, development stalled until hydroelectric development occurred in the 1950s and 1960s. Tourism in recent years has become a source of revenue for most countries of the subarctic due to the beautiful, generally glacial. Most areas in the subarctic are among the most expensive places in the world to visit, nonetheless, the great opportunities for outdoor recreation lure an ever-increasing number of travelers. At the same time, the industries of the subarctic are being threatened by both environmental opposition and overfishing leading to depleted stocks of commercially important species. Indigenous peoples of Subarctic America Muskeg Nordicity Northern Canada Subarctic climate Subarctic climate in, Ritter, the Physical Environment, an Introduction to Physical Geography
Subarctic
–
Subarctic vegetation in Canada (Larix laricina)
Subarctic
–
In
Fennoscandia and northwestern
Russia, oceanic influences soften winter temperatures; the lack of permafrost allow agriculture and infrastructure.
Lenvik, Norway, at 69°N.
21.
Northern Hemisphere
–
The Northern Hemisphere is the half of Earth that is north of the equator. For other planets in the Solar System, north is defined as being in the celestial hemisphere relative to the invariable plane of the solar system as Earths North pole. Due to the Earths axial tilt, winter in the Northern Hemisphere lasts from the December solstice to the March Equinox, the dates vary each year due to the difference between the calendar year and the astronomical year. Its surface is 60. 7% water, compared with 80. 9% water in the case of the Southern Hemisphere, the Arctic is the region north of the Arctic Circle. Its climate is characterized by cold winters and cool summers, precipitation mostly comes in the form of snow. The Arctic experiences some days in summer when the Sun never sets, the duration of these phases varies from one day for locations right on the Arctic Circle to several months near the North Pole, which is the middle of the Northern Hemisphere. Between the Arctic Circle and the Tropic of Cancer lies the Northern Temperate Zone, the changes in these regions between summer and winter are generally mild, rather than extreme hot or cold. However, a temperate climate can have very unpredictable weather, tropical regions are generally hot all year round and tend to experience a rainy season during the summer months, and a dry season during the winter months. In the Northern Hemisphere, objects moving across or above the surface of the Earth tend to turn to the right because of the coriolis effect, as a result, large-scale horizontal flows of air or water tend to form clockwise-turning gyres. These are best seen in circulation patterns in the North Atlantic. For the same reason, flows of air down toward the surface of the Earth tend to spread across the surface in a clockwise pattern. Thus, clockwise air circulation is characteristic of high pressure weather cells in the Northern Hemisphere, conversely, air rising from the northern surface of the Earth tends to draw air toward it in a counterclockwise pattern. Hurricanes and tropical storms spin counter-clockwise in the Northern Hemisphere, the shadow of a sundial moves clockwise in the Northern Hemisphere. When viewed from the Northern Hemisphere, the Moon appears inverted compared to a view from the Southern Hemisphere, the North Pole faces away from the galactic center of the Milky Way. The Northern Hemisphere is home to approximately 6.57 billion people which is around 90% of the total human population of 7.3 billion people
Northern Hemisphere
–
Northern Hemisphere highlighted in blue
22.
Family (biology)
–
In biological classification, family is one of the eight major taxonomic ranks, it is classified between order and genus. A family may be divided into subfamilies, which are intermediate ranks above the rank of genus. In vernacular usage, a family may be named one of its common members, for example, walnuts and hickory trees belong to the family Juglandaceae. What does or does not belong to a family—or whether a family should be recognized at all—are proposed and determined by practicing taxonomists. There are no rules for describing or recognizing a family. Taxonomists often take different positions about descriptions of taxa, and there may be no broad consensus across the community for some time. Some described taxa are accepted broadly and quickly, but others only rarely, if at all, the naming of families is codified by various international codes. In zoological nomenclature, the names of animals end with the suffix -idae. The concept of rank at time was not yet settled, and in the preface to the Prodromus Magnol spoke of uniting his families into larger genera. Carolus Linnaeus used the word familia in his Philosophia botanica to denote groups of plants, trees, herbs, ferns, palms. He used this term only in the section of the book. In zoology, the family as an intermediate between order and genus was introduced by Pierre André Latreille in his Précis des caractères génériques des insectes. He used families in some but not in all his orders of insects, families can be used for evolutionary, palaeontological and generic studies because they are more stable than lower taxonomic levels such as genera and species
Family (biology)
–
The hierarchy of
biological classification 's eight major
taxonomic ranks. An
order contains one or more families. Intermediate minor rankings are not shown.
23.
Genus
–
A genus is a taxonomic rank used in the biological classification of living and fossil organisms in biology. In the hierarchy of classification, genus comes above species. In binomial nomenclature, the name forms the first part of the binomial species name for each species within the genus. Felis catus and Felis silvestris are two species within the genus Felis, Felis is a genus within the family Felidae. The composition of a genus is determined by a taxonomist, the standards for genus classification are not strictly codified, so different authorities often produce different classifications for genera. Moreover, genera should be composed of units of the same kind as other genera. The term comes from the Latin genus, a noun form cognate with gignere, linnaeus popularized its use in his 1753 Species Plantarum, but the French botanist Joseph Pitton de Tournefort is considered the founder of the modern concept of genera. The scientific name of a genus may be called the name or generic epithet. It plays a role in binomial nomenclature, the system of naming organisms. The rules for the names of organisms are laid down in the Nomenclature Codes. The standard way of scientifically describing species and other lower-ranked taxa is by binomial nomenclature, the generic name forms its first half. For example, the gray wolfs binomial name is Canis lupus, with Canis being the name shared by the wolfs close relatives. The specific name is written in lower-case and may be followed by names in zoology or a variety of infraspecific names in botany. Especially with these names, when the generic name is known from context. Because animals are typically only grouped within subspecies, it is written as a trinomen with a third name. Dog breeds, meanwhile, are not scientifically distinguished, there are several divisions of plant species and therefore their infraspecific names generally include contractions explaining the relation. For example, the genus Hibiscus includes hundreds of other species apart from the Rose of Sharon or common garden hibiscus, Rose of Sharon doesnt have subspecies but has cultivars that carry desired traits, such as the bright white H. syriaca Diana. Hawaiian hibiscus, meanwhile, includes several separate species, since not all botanists agree on the divisions or names between species, it is common to specify the source of the name using author abbreviations
Genus
–
Number of reptile genera with a given number of species. Most genera have only one or a few species but a few may have hundreds. Based on data from the
Reptile Database (as of May 2015).
24.
Subspecies
–
In biological classification, subspecies is either a taxonomic rank subordinate to species, or a taxonomic unit in that rank. A subspecies cannot be recognized independently, a species will either be recognized as having no subspecies at all or at least two, in zoology, under the International Code of Zoological Nomenclature, the subspecies is the only taxonomic rank below that of species that can receive a name. In botany and mycology, under the International Code of Nomenclature for algae, fungi, in bacteriology and virology, under standard bacterial nomenclature and virus nomenclature, there are recommendations but not strict requirements for recognizing other important infraspecific ranks. A taxonomist decides whether to recognize a subspecies or not, the differences between subspecies are usually less distinct than the differences between species. In zoology, the International Code of Zoological Nomenclature accepts only one rank below that of species, other groupings, infrasubspecific entities do not have names regulated by the ICZN. Such forms have no official ICZN status, though they may be useful in describing altitudinal or geographical clines, pet breeds, transgenic animals, etc. While the scientific name of a species is a binomen, the name of a subspecies is a trinomen - a binomen followed by a subspecific name. A tigers binomen is Panthera tigris, so for a Sumatran tiger the trinomen is, for example, names published before 1992 in the rank of variety are taken to be names of subspecies. In botany, subspecies is one of many ranks below that of species, such as variety, subvariety, form, the subspecific name is preceded by subsp. or ssp. as Schoenoplectus californicus ssp. tatora. A botanical name consists of at most three parts, an infraspecific name includes the species binomial, and one infraspecific epithet, such as subspecies or variety. For example, Motacilla alba alba is the subspecies of the white wagtail. The subspecies name that repeats the name is referred to in botanical nomenclature as the subspecies autonym. When zoologists disagree over whether a population is a subspecies or a full species. A subspecies is a rank below species – the only recognized rank in the zoological code. Botanists and mycologists have the choice of ranks lower than subspecies, such as variety or form, in biological terms, rather than in relation to nomenclature, a polytypic species has two or more subspecies, races, or more generally speaking, populations that need a separate description. These are separate groups that are distinct from one another and do not generally interbreed. These subspecies, races, or populations, can be named as subspecies by zoologists, a monotypic species has no distinct population or races, or rather one race comprising the whole species. A taxonomist would not name a subspecies within such a species, monotypic species can occur in several ways, All members of the species are very similar and cannot be sensibly divided into biologically significant subcategories
Subspecies
–
Panthera tigris tigris
Bengal tiger. Indian subcontinent.
Subspecies
–
Panthera tigris altaica
Siberian tiger. Another subspecies of
tiger.
Subspecies
–
Panthera leo persica
Asiatic lion. The sole Asian subspecies of
lion.
Subspecies
–
Acinonyx jubatus jubatus
South African cheetah. Nominate subspecies of
cheetah.
25.
Atlantic Ocean
–
The Atlantic Ocean is the second largest of the worlds oceans with a total area of about 106,460,000 square kilometres. It covers approximately 20 percent of the Earths surface and about 29 percent of its surface area. It separates the Old World from the New World, the Atlantic Ocean occupies an elongated, S-shaped basin extending longitudinally between Eurasia and Africa to the east, and the Americas to the west. The Equatorial Counter Current subdivides it into the North Atlantic Ocean, in contrast, the term Atlantic originally referred specifically to the Atlas Mountains in Morocco and the sea off the Strait of Gibraltar and the North African coast. The Greek word thalassa has been reused by scientists for the huge Panthalassa ocean that surrounded the supercontinent Pangaea hundreds of years ago. The term Aethiopian Ocean, derived from Ancient Ethiopia, was applied to the Southern Atlantic as late as the mid-19th century, many Irish or British people refer to the United States and Canada as across the pond, and vice versa. The Black Atlantic refers to the role of ocean in shaping black peoples history. Irish migration to the US is meant when the term The Green Atlantic is used, the term Red Atlantic has been used in reference to the Marxian concept of an Atlantic working class, as well as to the Atlantic experience of indigenous Americans. Correspondingly, the extent and number of oceans and seas varies, the Atlantic Ocean is bounded on the west by North and South America. It connects to the Arctic Ocean through the Denmark Strait, Greenland Sea, Norwegian Sea, to the east, the boundaries of the ocean proper are Europe, the Strait of Gibraltar and Africa. In the southeast, the Atlantic merges into the Indian Ocean, the 20° East meridian, running south from Cape Agulhas to Antarctica defines its border. In the 1953 definition it extends south to Antarctica, while in later maps it is bounded at the 60° parallel by the Southern Ocean, the Atlantic has irregular coasts indented by numerous bays, gulfs, and seas. Including these marginal seas the coast line of the Atlantic measures 111,866 km compared to 135,663 km for the Pacific. Including its marginal seas, the Atlantic covers an area of 106,460,000 km2 or 23. 5% of the ocean and has a volume of 310,410,900 km3 or 23. 3%. Excluding its marginal seas, the Atlantic covers 81,760,000 km2 and has a volume of 305,811,900 km3, the North Atlantic covers 41,490,000 km2 and the South Atlantic 40,270,000 km2. The average depth is 3,646 m and the maximum depth, the bathymetry of the Atlantic is dominated by a submarine mountain range called the Mid-Atlantic Ridge. It runs from 87°N or 300 km south of the North Pole to the subantarctic Bouvet Island at 42°S, the MAR divides the Atlantic longitudinally into two halves, in each of which a series of basins are delimited by secondary, transverse ridges. The MAR reaches above 2000 m along most of its length, the MAR is a barrier for bottom water, but at these two transform faults deep water currents can pass from one side to the other
Atlantic Ocean
–
The Atlantic Ocean as seen from the western coast of
Portugal
Atlantic Ocean
–
The Atlantic Ocean, not including
Arctic and
Antarctic regions
Atlantic Ocean
–
The Atlantic Ocean as seen from
Atlantic City, New Jersey.
Atlantic Ocean
–
Myrtle Beach, South Carolina view of the Atlantic Ocean.
26.
Pacific Ocean
–
The Pacific Ocean is the largest and deepest of the Earths oceanic divisions. It extends from the Arctic Ocean in the north to the Southern Ocean in the south and is bounded by Asia and Australia in the west, the Mariana Trench in the western North Pacific is the deepest point in the world, reaching a depth of 10,911 metres. Both the center of the Water Hemisphere and the Western Hemisphere are in the Pacific Ocean, the oceans current name was coined by Portuguese explorer Ferdinand Magellan during the Spanish circumnavigation of the world in 1521, as he encountered favourable winds on reaching the ocean. He called it Mar Pacífico, which in both Portuguese and Spanish means peaceful sea, important human migrations occurred in the Pacific in prehistoric times. Long-distance trade developed all along the coast from Mozambique to Japan, trade, and therefore knowledge, extended to the Indonesian islands but apparently not Australia. By at least 878 when there was a significant Islamic settlement in Canton much of trade was controlled by Arabs or Muslims. In 219 BC Xu Fu sailed out into the Pacific searching for the elixir of immortality, from 1404 to 1433 Zheng He led expeditions into the Indian Ocean. The east side of the ocean was discovered by Spanish explorer Vasco Núñez de Balboa in 1513 after his expedition crossed the Isthmus of Panama and he named it Mar del Sur because the ocean was to the south of the coast of the isthmus where he first observed the Pacific. Later, Portuguese explorer Ferdinand Magellan sailed the Pacific East to West on a Castilian expedition of world circumnavigation starting in 1519, Magellan called the ocean Pacífico because, after sailing through the stormy seas off Cape Horn, the expedition found calm waters. The ocean was often called the Sea of Magellan in his honor until the eighteenth century, sailing around and east of the Moluccas, between 1525 and 1527, Portuguese expeditions discovered the Caroline Islands, the Aru Islands, and Papua New Guinea. In 1542–43 the Portuguese also reached Japan, in 1564, five Spanish ships consisting of 379 explorers crossed the ocean from Mexico led by Miguel López de Legazpi and sailed to the Philippines and Mariana Islands. The Manila galleons operated for two and a half centuries linking Manila and Acapulco, in one of the longest trade routes in history, Spanish expeditions also discovered Tuvalu, the Marquesas, the Cook Islands, the Solomon Islands, and the Admiralty Islands in the South Pacific. In the 16th and 17th century Spain considered the Pacific Ocean a Mare clausum—a sea closed to other naval powers, as the only known entrance from the Atlantic the Strait of Magellan was at times patrolled by fleets sent to prevent entrance of non-Spanish ships. On the western end of the Pacific Ocean the Dutch threatened the Spanish Philippines, Spain also sent expeditions to the Pacific Northwest reaching Vancouver Island in southern Canada, and Alaska. The French explored and settled Polynesia, and the British made three voyages with James Cook to the South Pacific and Australia, Hawaii, and the North American Pacific Northwest, one of the earliest voyages of scientific exploration was organized by Spain in the Malaspina Expedition of 1789–1794. It sailed vast areas of the Pacific, from Cape Horn to Alaska, Guam and the Philippines, New Zealand, Australia, and the South Pacific. Growing imperialism during the 19th century resulted in the occupation of much of Oceania by other European powers, and later, Japan, in Oceania, France got a leading position as imperial power after making Tahiti and New Caledonia protectorates in 1842 and 1853 respectively. After navy visits to Easter Island in 1875 and 1887, Chilean navy officer Policarpo Toro managed to negotiate an incorporation of the island into Chile with native Rapanui in 1888, by occupying Easter Island, Chile joined the imperial nations
Pacific Ocean
–
Maris Pacifici by
Ortelius (1589). One of the first printed maps to show the Pacific Ocean; see also
Waldseemüller map (1507).
Pacific Ocean
–
The Pacific Ocean
Pacific Ocean
–
USS
Lexington under air attack on 8 May 1942 during the
Battle of the Coral Sea
Pacific Ocean
–
Map of the Pacific Ocean during European Exploration, circa 1702–1707.
27.
Laptev Sea
–
The Laptev Sea is a marginal sea of the Arctic Ocean. It is located between the northern coast of Siberia, the Taimyr Peninsula, Severnaya Zemlya and the New Siberian Islands and its northern boundary passes from the Arctic Cape to a point with co-ordinates of 79°N and 139°E, and ends at the Anisiy Cape. The Kara Sea lies to the west, the East Siberian Sea to the east, the sea has a severe climate with temperatures below 0 °C over more than 9 months per year, low water salinity, scarcity of flora, fauna and human population, and low depths. It is frozen most of the time, though clear in August. The sea shores were inhabited for thousands of years by tribes of Yukaghirs and then Evens and Evenks. They were then settled by Yakuts and later by Russians, Russian explorations of the area started in the 17th century. They came from the south via several large rivers which empty into the sea, such as the prominent Lena River, the Khatanga, the Anabar, the Olenyok, the Omoloy, the sea contains several dozen islands, many of which contain well-preserved mammoth remains. Major human activities in the area are mining and navigation on the Northern Sea Route, the largest settlement and port is Tiksi. The International Hydrographic Organization defines the limits of the Laptev Sea as follows, the eastern limit of Kara Sea. A line joining Cape Molotov to the Northern extremity of Kotelni Island, from the Northern extremity of Kotelni Island – through Kotelni Island to Cape Madvejyi. Then through Malyi Island, to Cape Vaguin on Great Liakhov Island, thence to Cape Sviatoy Nos on the main land. Using current geographic names and transcription this definition corresponds to the shown in the map. The seas border starts at Arctic Cape on Komsomolets Island at 81°13′N 95°15′E and connects to Cape Rosa Luxemburg, the next segment crosses Red Army Strait and leads to Cape Vorochilov on October Revolution Island and afterwards through that island to Cape Anuchin at 79°39′37″N 100°21′22″E. Next, the border crosses Shokalsky Strait to Cape Unslicht at 79°25′04″N 102°31′00″E on Bolshevik Island and it goes further through the island to Cape Yevgenov at 78°17′N 104°50′E. From there, the border goes through Vilkitsky Strait to Cape Pronchishchev at 77°32′57″N 105°54′4″E on the Tamyr peninsula, the southern boundary is the shore of the Asian mainland. Prominent features are the Khatanga Gulf and the delta of the Lena River, in the east, the polygon crosses the Dmitry Laptev Strait. It connects Cape Svyatoy Nos at 72. 7°N141. 2°E /72.7,141. 2 with Cape Vagin at 73°26′0″N 139°50′0″E in the very east of Bolshoy Lyakhovsky Island. Next, the Laptev Sea border crosses Eterikan Strait to Little Lyakhovsky Island at 74. 0833°N140. 5833°E /74.0833,140. 5833 up to Cape Medvezhiy, finally, there is a segment through Kotelny Island to Cape Anisy, its northernmost headland 76°10′N 138°50′E
Laptev Sea
–
Laptev Sea's limits as defined by the
International Hydrographic Organization. This definition and
bathymetry with 1
arc-minute resolution leads to an area of 502000
km 2 which compares to 672000
km 2 from WolframAlpha.
Laptev Sea
–
Laptev Sea
Laptev Sea
–
The shore of the
Anabar Bay.
Laptev Sea
–
The frozen Laptev Sea. Thinning of the ice reveals blue and green water color. New Siberian Islands are near the middle and the Great Siberian Polynya is in the left part of the image.
28.
Tusk
–
The M1 Abrams is an American third-generation main battle tank. It is named after General Creighton Abrams, former Army chief of staff, highly mobile, designed for modern armored ground warfare, the M1 is well armed and heavily armored. Notable features include the use of a powerful multifuel turbine engine, the adoption of sophisticated composite armor, weighing nearly 68 short tons, it is one of the heaviest main battle tanks in service. The M1 Abrams entered U. S. service in 1980, the M1 remains the principal main battle tank of the United States Army and Marine Corps, and the armies of Egypt, Kuwait, Saudi Arabia, Australia and Iraq. Three main versions of the M1 Abrams have been deployed, the M1, M1A1, and M1A2, incorporating improved armament, protection and these improvements and other upgrades to in-service tanks have allowed this long-serving vehicle to remain in front-line service. In addition, development for the improved M1A3 version was reported in 2009, the M1 Abrams was developed during the Cold War as a successor to the canceled MBT-70. The M1 Abrams contract went to Chrysler Defense and was the first vehicle to adopt Chobham armor, adaptations before the Persian Gulf War gave the vehicle better firepower and NBC protection. Being vastly superior to Iraqi tanks, very few M1 tanks were hit by enemy fire, Upgrades after the war improved the tanks weapons sights and fire control unit. The Abrams participated in the 2003 invasion of Iraq, exposing vulnerabilities in urban combat that were addressed with the TUSK modification, the Marine Corps sent a company of M1A1 Abrams tanks to Afghanistan in 2010. The first attempt to replace the aging M60 tank was the MBT-70, the MBT-70 had advanced features such as a height-adjustable air suspension and a very low-profile chassis with the driver located in the turret. The MBT-70 ultimately proved to be too heavy, complex, as a result of the imminent failure of this project, the U. S. Army introduced the XM803, using some technologies from the MBT-70 but removing some of the more troublesome features. This succeeded only in producing a system with capabilities similar to the M60. Congress canceled the MBT-70 in November and XM803 December 1971, and redistributed the funds to the new XM815, prototypes were delivered in 1976 by Chrysler Defense and General Motors armed with the license-built version of the 105 mm Royal Ordnance L7 gun along with a Leopard 2 for comparison. The turbine-powered Chrysler Defense design was selected for development as the M1, in February 1982, General Dynamics Land Systems Division purchased Chrysler Defense, after Chrysler built over 1,000 M1s. A total of 3,273 M1 Abrams tanks were produced 1979–85, Production at the government-owned, GDLS-operated Lima Army Tank Plant in Lima, Ohio, was joined by vehicles built at the Detroit Arsenal Tank Plant in Warren, Michigan from 1982 to 1996. The M1 was armed with the version of the 105 mm Royal Ordnance L7 gun. An improved model called the M1IP was produced briefly in 1984, the M1IP models were used in the Canadian Army Trophy NATO tank gunnery competition in 1985 and 1987. Production of M1 and M1A1 tanks totaled some 9,000 tanks at a cost of approximately $4.3 million per unit, by 1999, costs for the tank were upwards of US$5 million a vehicle
Tusk
–
An XM1 Abrams, during a demonstration at Fort Knox, Kentucky in 1979
Tusk
Tusk
–
Abrams move out on a mission during Desert Storm in 1991. A
Bradley IFV and logistics convoy can be seen in the background.
Tusk
–
A destroyed M1A1, lost to friendly fire.
29.
Vibrissa
–
They are specialised for tactile sensing. Vibrissae grow in places on most mammals, including all primates except humans. In medicine, the term also refers to the thick hairs found inside human nostrils. Vibrissae typically grow in groups in different locations on an animal and these groups are relatively well conserved across land mammals, and somewhat less well conserved between land and marine mammals. Most simply described, macrovibrissae are large, motile and used for sensing, whereas microvibrissae are small, immotile. These two sub-groups can be identified in the image of the rat, but it can also be seen that there is no clear physical boundary between them. Apart from cranial vibrissae, other groups are found elsewhere on the body, many land mammals, including domestic cats, also have carpal vibrissae on the underside of the leg just above the paws. Whilst these five major groups are reported in studies of land mammals. Marine mammals can have substantially different vibrissal arrangements, for instance, cetaceans have lost the vibrissae around the snout and gained vibrissae around their blowholes, whereas every single one of the body hairs of the Florida manatee may be a vibrissa. Other marine mammals have cranial vibrissal groups that appear to correspond closely to those described for land mammals, the vibrissal hair is usually thicker and stiffer than other types of hair but, like other hairs, the shaft consists of an inert material and contains no nerves. The mystacial macrovibrissae are shared by a group of land and marine mammals. The arrangement of whiskers is not random, they form an ordered grid of arcs and rows, with shorter whiskers at the front. In the mouse, gerbil, hamster, rat, guinea pig, rabbit and these cells serve an even larger number of mechanoreceptors of at least eight distinct types. Accordingly, even small deflections of the hair can evoke a sensory response in the animal. Rats and mice typically have approximately 30 macrovibrissae on each side of the face, with lengths up to around 50 mm in rats,30 mm in mice. Thus, an estimate for the number of sensory nerve cells serving the mystacial vibrissal array on the face of a rat or mouse might be 25,000. Rats and mice are considered to be specialists, but marine mammals may make even greater investment in their vibrissal sensory system. Manatees, remarkably, have around 600 vibrissae on or around their lips, Whiskers can be very long in some species, the length of a chinchillas whiskers can be more than a third of its body length
Vibrissa
–
A
Patagonian fox showing four major cranial groups of vibrissae: supraorbital (above the eye), mystacial (where a moustache would be), genal (on the cheek, far left), and mandibular (pointing down, under the snout).
Vibrissa
–
A pet rat clearly showing the grid-like arrangement of the macrovibrissae on the face, and the microvibrissae under the nostrils. The supraorbital vibrissae above the right eye are also visible.
Vibrissa
–
All the hairs of the
manatee may be vibrissae.
Vibrissa
–
Macrovibrissae and supraorbital vibrissae of
Phoca vitulina.
30.
Elephant seal
–
Elephant seals are large, oceangoing earless seals in the genus Mirounga. The two species, the elephant seal and the southern elephant seal, were both hunted to the brink of extinction by the end of the 19th century, but the numbers have since recovered. The northern elephant seal, somewhat smaller than its southern relative, the most northerly breeding location on the Pacific Coast is at Race Rocks, at the southern tip of Vancouver Island in the Strait of Juan de Fuca. In southern Chile, there is a colony of 120 animals at Jackson Bay, Admiralty Sound. The oldest known unambiguous elephant seal fossils are fossils of an unnamed member of the tribe Miroungini described from the late Pliocene Petane Formation of New Zealand. Elephant seals breed annually and are faithful to colonies that have established breeding areas. Elephant seals take their name from the proboscis of the adult male. The bulls proboscis is used in producing extraordinarily loud roaring noises, more importantly, however, the nose acts as a sort of rebreather, filled with cavities designed to reabsorb moisture from the animals exhalations. This is important during the season when the seals do not leave the beach to feed. Northern elephant seal bulls reach a length of 4.3 to 4.8 m, elephant seals spend upwards of 80% of their lives in the ocean. They can hold their breath for more than 100 minutes – longer than any other noncetacean mammal, elephant seals dive to 1,550 m beneath the oceans surface. Their stomachs also often contain gastroliths, while excellent swimmers, they are also capable of rapid movement on land. Elephant seals are shielded from cold by their blubber, more so than by fur. The animals hair and outer layers of skin molt in large patches, the skin has to be regrown by blood vessels reaching through the blubber. When molting occurs, the seal is susceptible to the cold, northern males and young adults haul out during June to July to molt, northern females and immature seals during April to May. Elephant seals have a large volume of blood, allowing them to hold a large amount of oxygen for use when diving. They have large sinuses in their abdomens to hold blood and can store oxygen in their muscles with increased myoglobin concentrations in muscle. In addition, they have a proportion of oxygen-carrying red blood cells
Elephant seal
–
Elephant seal
Elephant seal
–
Skull of a northern elephant seal.
Elephant seal
–
South Georgia elephant seal
Elephant seal
–
Elephant seals (Mirounga angustirostris) on Piedras Blancas beach, near
San Simeon, California
_skull_at_the_Royal_Veterinary_College_anatomy_museum.JPG)
. PMID 17996107. doi:10.1186/1471-2148-7-216.
Data related to Odobenus rosmarus at Wikispecies
Media related to Odobenus rosmarus at Wikimedia Commons
