Eurypteroid :: Eurypteroid (a.) Like, or pertaining to, the genus Euryperus..

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

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

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