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Definition of: crossopterygian
(kro·sop′tə·rij′ē·ən) noun Zool.
Any of a group (Crossopterygii) of bony fishes abundant in the Devonian period, having paddle–shaped, lobate fins: they are regarded as the direct ancestors of amphibians. [<NL Crossopterygii <Gk. krossoi fringe + pterygia fins of a fish, plural dim. of pteryx wing]
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