Concise hierarchy

(Kingdom) Animalia - (Phylum) Chordata - (Class) Actinopteri

Current position

Protacanthopterygii (Infracohort) Greenwood et al., 1966

Ref: R. van der Laan, 2018: 68.

Alternative positions

Actinopteri (Class) Cope, 1871	Ref: R. van der Laan et al., 2021: (4 Feb 2025); ECoF(4 Feb 2025).
Osmeromorpha (Superorder)	Ref: J.S. Nelson et al., 2016: 252; Nelson et al., 2016: fig. (p. 242).
Protacanthopterygii (Subcohort) Greenwood et al., 1966	Ref: R. Betancur-R et al., 2017: 18.
Protacanthopterygii (Superorder) Greenwood et al., 1966	Ref: J.S. Nelson, 2006: 190.

Historical positions

Protacanthopterygii (Infracohort) Greenwood et al., 1966	Ref: R. van der Laan, 2018: 68.
Protacanthopterygii (Subcohort) Greenwood et al., 1966	Ref: R. Betancur-R et al., 2017: 18, fig. 1.
Osmeromorpha (Superorder)	Ref: J.S. Nelson et al., 2016: 252, fig. (p. 242).
Protacanthopterygii (Subcohort) Greenwood et al., 1966	Ref: E.O. Wiley & G.D. Johnson, 2010: 126, 141.
Protacanthopterygii (Superorder) Greenwood et al., 1966	Ref: J.S. Nelson, 2006: 190.

Number of Subtaxa

2025	Available in Systema Naturae 2000	4f;23g;78s; †1f;1g
1989-present	Systema Naturae 2000: 10 Jun 2025	[4f;23g; †1f]
2018	R. van der Laan: 68	[4f; †1f]
2017	R. Betancur-R et al.: 18	[4f]
2016	J.S. Nelson et al.: 254	[4f]
2010	E.O. Wiley & G.D. Johnson: 141	2so;[6f]