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Definition: Eurypteroidea
Eurypteroidea
\Eu*ryp`te*roi"de*a\, n. pl. [NL. See
Eurypteroid.] (Paleont.)
An extinct order of Merostomata, of which the genus
Eurypterus is the type. They are found only in Paleozoic
rocks. [Written also
Eurypterida.]
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