Actinopteri | |
---|---|
Atlantic sturgeon ( Chondrostei) | |
Atlantic salmon ( Neopterygii) | |
Scientific classification | |
Domain: | Eukaryota |
Kingdom: | Animalia |
Phylum: | Chordata |
Class: | Actinopterygii |
(unranked): |
Actinopteri Cope, 1871 |
Subclasses | |
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]
Actinopteri 400 mya |
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