Tardigrade
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Tardigrades, also known as water bears or moss piglets, are a phylum of eight-legged segmented micro-animals. They were first described by the German zoologist Johann August Ephraim Goeze in 1773, who
Echiniscus insularis Figure 6
Shed cuticle of female tardigrade, containing eggs, each 50μm across
The 2007 FOTON-M3 mission carrying the BIOPAN astrobiology payload (illustrated) exposed tardigrades to vacuum, solar ultraviolet, or both, showing their ability to survive in the space environment.
The first drawing of a tardigrade, by Johann August Ephraim Goeze, 1773
Animal
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Animals are multicellular, eukaryotic organisms belonging to the biological kingdom Animalia. Animals consume organic material, breathe oxygen, have muscle cells, can reproduce sexually, and grow from
Tardigrade
…Middle Cambrian stem-group fossils Milnesium tardigradum, a eutardigrade Echiniscus insularis, a heterotardigrade Scientific classification Kingdom: Animalia Subkingdom: Eumetazoa Clade: ParaHoxozoa Clade: Bilateria Clade: Nephrozoa Clade: Protostomia Superphylum: Ecdysozoa Clade: Panarthropoda Phylum…
Sexual reproduction is nearly universal in animals, such as these dragonflies.
Predators, such as this ultramarine flycatcher (Ficedula superciliaris), feed on other animals.
Hydrothermal vent mussels and shrimps
The blue whale is the largest animal that has ever lived; it can be up to 33.6 metres (110 ft) long.