单词	Palaeostraca
释义	Palaeostraca plural noun Palae·​os·​tra·​ca ˌpālēˈästrə̇kə, ˌpal- also -ˈȯs- in some classifications : a class of arthropods comprising the horseshoe crabs, the eurypterids, and sometimes the trilobites compare merostomata palaeostracan ¦⸗⸗¦⸗⸗kən adjective or noun Word History Etymology New Latin, from pale- + -ostraca
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