Actinopteri /æktɪˈnɒptəraɪ/ 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 minus the bichirs.
In this clade the lungs have evolved into a swim bladder.[1]
Characters of Actinopteri:[2] 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[3][4][5][6] summarizes the evolutionary relationships of extant Actinopteri. Divergence time for each clade in mya are based on:[7]
Acipenseriformes (sturgeons, paddlefish)
Teleostei 310 mya
Amiiformes (bowfin)
Lepisosteiformes (gars, alligator gars)
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