Palaeostraca
plural noun
Palae·os·tra·ca
| \ ˌpālēˈästrə̇kə, ˌpal- also -ˈȯs-\
Definition of Palaeostraca
in some classifications
: a class of arthropods comprising the horseshoe crabs, the eurypterids, and sometimes the trilobites — compare merostomata
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