Concise hierarchy

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

Current position

Cyclostomata (Class) Richards

Ref: J.S. Nelson, 2006: 24. [indirect]

Alternative positions

Agnatha (Class) Cope, 1889	Ref: N. Bailly et al., 2001: 358.
Cephalaspidomorpha (Subclass)	Ref: R.L. Carroll, 1988: 596.
†Cephalaspidomorphi (Class) Moy-Thomas & Mile, 1971	Ref: W.N. Eschmeyer & J.D. Fong, 2011: 26.
Petromyzontida (Subclass)	Ref: W.N. Eschmeyer, 1998: 2449. [indirect]
Petromyzontida (Class)	Ref: J.S. Nelson, 2006: 24.

Historical positions

†Cephalaspidomorphi (Class) Moy-Thomas & Mile, 1971	Ref: W.N. Eschmeyer, 2004-2016: 24 Jan 2006.
†Cephalaspidomorphi (Class) Moy-Thomas & Mile, 1971	Ref: W.N. Eschmeyer & J.D. Fong, 2011: 26.
Petromyzontida (Class)	Ref: J.S. Nelson, 2006: 24-25.
Agnatha (Class) Cope, 1889	Ref: N. Bailly et al., 2001: 358.
Cephalaspidomorpha (Class)	Ref: 2000
†Cephalaspidomorphi (Class) Moy-Thomas & Mile, 1971	Ref: 1998
†Cephalaspidomorphi (Class) Moy-Thomas & Mile, 1971	Ref: W.N. Eschmeyer, 1998: [2449].
†Cephalaspidomorphi (Class) Moy-Thomas & Mile, 1971	Ref: 1995
Cephalaspidomorpha (Subclass)	Ref: R.L. Carroll, 1988: 596.
Cyclostomata (Class) Richards	Ref: T.I. Storer et al., 1979

Number of Subtaxa

2024	Available in Systema Naturae 2000	3f;10g;43s; †1f;4g;4s
1989-present	Systema Naturae 2000	[3f;10g;43s; †1f;4g;4s]
2004-2016	W.N. Eschmeyer	[1f]
2011	W.N. Eschmeyer & J.D. Fong: 26	1f
1998	W.N. Eschmeyer: 2449	[1f;31ng]
1988	R.L. Carroll: 596	[1f; †1f]
1979	T.I. Storer et al.	~30s