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以上来源于: WordNet
N any vertebrate of the superclass Gnathostomata, having a mouth with jaws, including all vertebrates except the agnathans 颚口类脊椎动物
Chondrichthyes (sharks, rays and chimaeras) account for only 2% of gnathostome species, the Osteichthyes accounting for the other 98%.
软骨鱼类(鲨鱼、鳐、银鲛)仅占有颌类物种数的2%，其余98%的有颌类都属于硬骨鱼类。
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