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Paleocarida :: Paleocarida (n. pl.) Same as Merostomata.

Poecilopoda :: Poecilopoda (n. pl.) By some recent writers applied to the Merostomata.

Eurypterus :: Eurypterus (n.) A genus of extinct Merostomata, found in Silurian rocks. Some of the species are more than three feet long..

Limulus :: Limulus (n.) The only existing genus of Merostomata. It includes only a few species from the East Indies, and one (Limulus polyphemus) from the Atlantic coast of North America. Called also Molucca crab, king crab, horseshoe crab, and horsefoot..

Eurypteroidea :: Eurypteroidea (n. pl.) An extinct order of Merostomata, of which the genus Eurypterus is the type. They are found only in Paleozoic rocks..

Merostomata :: Merostomata (n. pl.) 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..

Limuloidea :: Limuloidea (n. pl.) An order of Merostomata, including among living animals the genus Limulus, with various allied fossil genera, mostly of the Carboniferous period. Called also Xiphosura..

Neocarida :: Neocarida (n. pl.) The modern, or true, Crustacea, as distinguished from the Merostomata..

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