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Polypteroidei :: Polypteroidei (n. pl.) A suborder of existing ganoid fishes having numerous fins along the back. The bichir, or Polypterus, is the type. See Illust. under Crossopterygian..

Acanthopterygian :: Acanthopterygian (n.) A spiny-finned fish.

Acanthopterygian :: Acanthopterygian (a.) Belonging to the order of fishes having spinose fins, as the perch..

Cheiropterygia :: Cheiropterygia (pl. ) of Cheiropterygiu.

Sauropterygia :: Sauropterygia (n. pl.) Same as Plesiosauria.

Ichthyopterygia :: Ichthyopterygia (n. pl.) See Ichthyosauria.

Chondropterygian :: Chondropterygian (n.) One of the Chondropterygii.

Ichthyosauria :: Ichthyosauria (n. pl.) An extinct order of marine reptiles, including Ichthyosaurus and allied forms; -- called also Ichthyopterygia. They have not been found later than the Cretaceous period..

Malacopterygian :: Malacopterygian (n.) One of the Malacopterygii.

Crossopterygian :: Crossopterygian (a.) Of or pertaining to the Crossopterygii.

Dipterygian :: Dipterygian (a.) Having two dorsal fins; -- said of certain fishes.

Chondropterygian :: Chondropterygian (a.) Having a cartilaginous skeleton.

Propterygia :: Propterygia (pl. ) of Propterygiu.

Pterygia :: Pterygia (pl. ) of Pterygiu.

Crossopterygian :: Crossopterygian (n.) One of the Crossopterygii.

Plesiosauria :: Plesiosauria (n. pl.) An extinct order of Mesozoic marine reptiles including the genera Plesiosaurus, and allied forms; -- called also Sauropterygia..

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