Chordate

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Chordates are animals possessing a notochord, a hollow dorsal nerve cord, pharyngeal slits, an endostyle, and a post-anal tail for at least some period of their life cycles. Taxonomically, the phylum includes the subphyla Vertebrata, which includes fish, amphibians, reptiles, birds, and mammals; Tunicata, which includes salps and sea squirts; and Cephalochordata, comprising the lancelets.

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Amphibia 1.jpg
Amphibians
Cephalocordate.jpg
Cephalochordate
Fishes 1.jpg
Fishes
Chordate.jpg
Haikouella
Synapsida 1.jpg
Mammals and ancestors
Diapsida 1.jpg
Two arches" reptiles
Tunicate 1.jpg
Tunicate
Anapsida 1.jpg
Turtles and ancestors