Concise hierarchy

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

Current position

Agnatha (Class) Cope, 1889

Ref: M.J. Benton, 2015: 434; Benton, 2015: box 3.1 (p. 48).

Alternative positions

Cephalaspidomorpha (Subclass)	Ref: R.L. Carroll, 1988: 596.
Cephalaspidomorphi (Subclass) Kiaer & Stensiö, 1920
†Cephalaspidomorphi (Class) Kiaer & Stensiö, 1920	Ref: J.J. Sepkoski Jr., 2002: 298.
†Cephalaspidomorphi (Subclass) Kiaer & Stensiö, 1920	Ref: B. Grzimek et al., 1974: 45. [inferred rank]
ostracoderms ([unranked])	Ref: A.S. Romer & T.S. Parsons, 1986: App. 1 (p. 620).
†Ostracophori (Class)	Ref: D.S. Jordan, 1923: 87.

Historical positions

Agnatha (Class) Cope, 1889	Ref: M.J. Benton, 2015: 434, box 3.1 (p. 48).
Agnatha (Class) Cope, 1889	Ref: M.J. Benton, 2005: 390, box 3.1.
†Cephalaspidomorphi (Class) Kiaer & Stensiö, 1920	Ref: J.J. Sepkoski Jr., 2002: 298.
Cephalaspidomorpha (Subclass)	Ref: R.L. Carroll, 1988: 596.
Ostracoderms ([unranked])	Ref: A.S. Romer & T.S. Parsons, 1986: App. 1 (p. 620).
†Cephalaspidomorphi (Subclass) Kiaer & Stensiö, 1920	Ref: B. Grzimek et al., 1974: 45. [inferred rank]
†Ostracophori (Class)	Ref: D.S. Jordan, 1923: 87.

Number of Subtaxa

2026	Available in Systema Naturae 2000	†1g
1988	R.L. Carroll: 596	[; †5f]
1923	D.S. Jordan: 87	[; †2f]