单词	Heterodontidae
释义	Heterodontidae plural noun Het·​er·​odon·​ti·​dae -təˌdē : a family of small sharks (suborder Squaloidea) having a few recent representatives in warm parts of the Pacific and Indian oceans but known since Jurassic times, bearing two dorsal fins each armed with a spine, and having the posterior teeth arranged in a dense pavement adapted for crushing the shells of mollusks see heterodontus Word History Etymology New Latin, from Heterodontus, type genus + -idae
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