Merostomata — A class of Arthropoda, allied to the Crustacea. It includes the trilobites, Eurypteroidea, and Limuloidea. All are extinct except the horseshoe crabs of the last group. See Limulus.
These Also : Eurypteroidea; Eurypterus; Limuloidea; Limulus; Neocarida; Paleocarida; Poecilopoda;
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