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A chordate is an animal of the phylum Chordata . During some period of their life cycle, chordates possess a notochord, a dorsal nerve cord, pharyngeal slits, and a post-anal tail: these four anatomical features define this phylum. Chordates are also bilaterally symmetric, and have a coelom, metameric segmentation, and circulatory system. The Chordata and Ambulacraria together form the superphylum... en.wikipedia.org