Actinopteri

 ( Ray-finned Fish Taxonomy ) 

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

Dating back to the Permian period, the Actinopteri comprise the Chondrostei ( and paddlefish), the Holostei ( and ), and the ; 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.

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Classification The following cladogram

Joseph, S. Nelson (2025). 9781118342336, John Wiley & Sons, Inc. ISBN 9781118342336

summarizes the phylogeny of extant Actinopteri. Divergence time for each clade in myr are based on:

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