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 Cephalochordata, comprising the lancelets; Tunicata, which includes salps and sea squirts; and Vertebrata, which includes fish, amphibians, reptiles, birds, and mammals.

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Cephalocordate.jpg
Cephalochordate
Tunicate 1.jpg
Tunicate
Chordate.jpg
Haikouella