merostomata

Merostomata

Mer`o*stom"a*ta\, n. pl. [NL., fr. Gr. ? thigh + ?, -?, mouth.] (Zo["o]l.) 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.
Webster's Revised Unabridged Dictionary, © 1996, 1998 MICRA, Inc.
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