单词 | heterostracan |
释义 | heterostracan in American English (ˌhetəˈrɑstrəkən) noun Paleontology any of several ostracoderms of the order Heterostraci, from the Silurian and Devonian Periods, having the anterior part of the body enclosed in bony plates Word origin [‹ NL Heterostrac(i) (pl.) name of the order, equiv. to heter- heter- + Gk ostrak(ón) (sing.) shell + -an] |
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