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The Actinopterygii, or ray-finned fish, are a class of fish within the  group of bony fish (Osteichthyes). Unlike cartilaginous  fish (Chondrichthyes), bony fishes posses a skeleton completly composed of bone. The ray-finned fish are not the only class within the Osteichthyes, the lobe-finned fish (Sarcopterygii) are also placed in this group.

Diplomystus, a well preserved ray-finned fish from the Eocene of Wyoming, USA



Photos or locations for Actinopterygii on this site

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