Actinopteri

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

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.

^ Funk, Emily; Lencer, Ezra; McCune, Amy (September 2020). "Dorsoventral inversion of the air-filled organ (lungs, gas bladder) in vertebrates: RNA-sequencing of laser capture microdissected embryonic tissue". Journal of Experimental Zoology. Part B, Molecular and Developmental Evolution. 334 (6): 325–338. Bibcode:2020JEZB..334..325F. doi:10.1002/jez.b.22998. PMC 8094346. PMID 32864827.
^ Patterson, Colin (1982). "Morphology and Interrelationships of Primitive Actinopterygian Fishes". American Zoologist. 22 (241): 241–259. doi:10.1093/icb/22.2.241.

[1] Funk, Emily; Lencer, Ezra; McCune, Amy (September 2020). "Dorsoventral inversion of the air-filled organ (lungs, gas bladder) in vertebrates: RNA-sequencing of laser capture microdissected embryonic tissue". Journal of Experimental Zoology. Part B, Molecular and Developmental Evolution. 334 (6): 325–338. Bibcode:2020JEZB..334..325F. doi:10.1002/jez.b.22998. PMC 8094346. PMID 32864827.

[2] Patterson, Colin (1982). "Morphology and Interrelationships of Primitive Actinopterygian Fishes". American Zoologist. 22 (241): 241–259. doi:10.1093/icb/22.2.241.

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