Definitions for "Merostomata"
A class of Arthropoda, allied to the Crustacea. It includes the trilobites, Eurypteroidea, and Limuloidea. All are extinct except the horseshoe crabs (Limulus) of the last group. See Limulus.
used in some classifications; includes the orders Xiphosura and Eurypterida
(mer - oh -stow - ma -tuh) Legs attached to the mouth. The class of Arthropods to which all four remaining horseshoe crab species belong.