gnathostomata
有頜類
Gna·thos·to·ma n. pl. Zool. A comprehensive division of vertebrates, including all that have distinct jaws, in contrast with the leptocardians and marsipobranchs (Cyclostoma), which lack them. [Written also Gnathostomata.]
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Gnathostomata
n : comprising all vertebrates with upper and lower jaws [syn: superclass
Gnathostomata]