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Answer for the clue "Extinct aquatic arthropods of the Paleozoic ", 11 letters:
eurypterida

Word definitions for eurypterida in dictionaries

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
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 .] [1913 Webster] ||