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Osteichthyes and condrichthyes

What are the features do osteichthyes and condrichthyes get such names?

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“Chondros” signifies cartilage, “ictis” signifies fish (both from Greek); the name chondrichtians is for fishes by cartilaginous endoskeleton. The term osteichthyes comes from the subsistence of a bony endoskeleton in such fishes (“osteo” signify bone, from the Greek as well).

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