Vertebrate
Videos
Vertebrates, also called craniates, are animals with a vertebral column and a cranium. The vertebral column surrounds and protects the spinal cord, while the cranium protects the brain.
Fossilized skeleton (cast) of Diplodocus carnegii, showing an extreme example of the vertebral column that gives the vertebrates their name. The species is a tetrapod, its four legs adapting the fish-like body plan for walking on land. The specimen is 26 m (85 ft) long.
Branchial arches bearing gills in a pike
The Cambrian Haikouichthys, 518 mya
Acanthostega, a Devonian labyrinthodont, c. 365 mya
Agnatha
Videos
Agnatha or jawless fish is a paraphyletic infraphylum of animals in the subphylum Vertebrata of the phylum Chordata, characterized by the lack of jaws. The group consists of both living and extinct cl
Vertebrate
…in the phylum Chordata. The vertebrates include mammals, birds, amphibians, and various classes of fish and reptiles. The fish include the jawless Agnatha, and the jawed Gnathostomata. The jawed fish include both the cartilaginous fish and the bony fish. Bony fish include the lobe-finned fish, which gave…
Одинока мінога
Eptatretus hexatrema 15727711
Pacific lamprey facing right
Thyestes verrucosus 22DB