“epitheca”的概念、定义、翻译、参考文献-科学参考

单词	epitheca
释义	epitheca [¦ep·ǝ`thē·kǝ] ^{INVERTEBRATE ZOOLOGY} 1. An external, calcareous layer around the basal portion of the theca of many corals. 2. A protective covering of the epicone. 3. The outer portion of a diatom frustule.
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