英语词汇“ptyctodontida”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典

单词	ptyctodontida
释义	Ptyctodontida Ptyctodontida [‚tik·tə′dänt·əd·ə] (paleontology) An order of Middle and Upper Devonian fishes of the class Placodermi in which both the head and trunk shields are present, and the joint between them is a well-differentiated and variable structure.
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Ptyctodontida