| 单词 | heterostracan |
| 释义 | heterostracan /het'euh ros"treuh keuhn/, n. Paleontol. 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. [ < NL Heterostrac(i) (pl.) name of the order, equiv. to heter- HETER- + Gk ostrak(ón) (sing.) shell + -AN] |
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