Unformatted text preview: Chordate Member of the phylum Chordata, animals that at some point during their development have a notochord; a dorsal, hollow nerve cord; pharyngeal slits or clefts; and a muscular, post-anal tail. Chorion (kor´-e-on) The outermost of four extraembryonic membranes. It functions in gas exchange and contributes to the formation of the mammalian placenta....
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- Spring '10