Vertebrate
Vertebrates /ˈvɜːrtᵻbrᵻts/ comprise all species of animals within the subphylum Vertebrata /-ɑː/ (chordates with backbones). Vertebrates represent the overwhelming majority of the phylum Chordata, with currently about 64,000 species described. Vertebrates include the jawless fish and the jawed vertebrates, which include the cartilaginous fish (sharks and rays) and the bony fish. A bony fish clade known as the lobe-finned fishes is included with tetrapods, which are further divided into amphibians, reptiles, mammals, and birds. Extant vertebrates range in size from the frog species Paedophryne amauensis, at as little as 7.7 mm (0.30 in), to the blue whale, at up to 33 m (108 ft). Vertebrates make up about 4% of all described animal species; the rest are invertebrates, which lack vertebral columns.
The vertebrates traditionally include the hagfish, which do not have proper vertebrae, though their closest living relatives, the lampreys, do. Hagfish do, however, possess a cranium. For this reason, the vertebrate subphylum is sometimes referred to as "Craniata" when discussing morphology. Molecular analysis since 1992 has suggested that the hagfish are most closely related to lampreys, and so also are vertebrates in a monophyletic sense. Others consider them a sister group of vertebrates in the common taxon of craniata.
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"You are beautiful no matter what they say. Words can't bring you down." - Christina Aguilera
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look at me if im not invisible
Nose Face Facial expression Mammal Vertebrate Orange Head Cat like mammal
I'm not the best, but this has got to be my best YET.
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i tried my best, i hope you all like it
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he's my least favorite but i love faust the snake
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he didn't think you were serious at the time
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For my sister, who hates Harry Potter.
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Stop hurting us. top it with my friends. leave us alone.
Shaw
Tiger Whiskers Wildlife Animal Mammal Vertebrate Close up Carnivoran Northern inuit dog Cat like mammal
inspired by a friend's profile picture