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Actinopteri

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Actinopteri

Actinopteri (/æktɪˈnɒptər/) is the sister group of Cladistia (bichirs) in the class Actinopterygii (ray-finned fish).

Dating back to the Permian period, the Actinopteri comprise the Chondrostei (sturgeons and paddlefish), the Holostei (bowfins and gars), and the teleosts; in other words, all extant ray-finned fish other than the bichirs.

In this clade the lungs have evolved into a swim bladder.

Characters of Actinopteri include paired fin structure, a single dorsal fin, fulcra, a large median gular and numerous branchiostegals, ganoid scales, and a valvula cerebelli in the brain.

The following cladogram summarizes the evolutionary relationships of extant Actinopteri. Divergence time for each clade in mya are based on:

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clade of ray-finned fishes (Actinopterygii)
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