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
adjective or noun
¦⸗⸗¦⸗⸗kən
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Merriam-Webster unabridged
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