chondrichthyes defined in 1951 yearchondrichthyes - chondrichthyes;
chondrichthyes - Cartilaginous fish. Class of vertebrates containing the Selachii (sharks, dogfish, skates, rays), Holocephali (chimaeras), and some fossil groups. Characterized by absence of true bone (although the cartilaginous skeleton is often calcified); complicated copulatory organs ('claspers') formed from pelvic fins of males; denticles; no air bladder. (Compare with: Actinopterygii and Choanichthyes, the other two classes of living fish.) Almost exclusively marine, and unlike the other fish classes, have been so throughout their known fossil history, though ancestors probably lived in fresh water. First appear in late Devonian. See also: Elasmobranchii.
near chondrichthyes in Knolik
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