Concise hierarchy

(Kingdom) Animalia - (Phylum) Chordata - (Class) Reptilia - (Order) Ornithischia

Phylogeny

Possibly Paraphyletic/Ancestral (para)		Ref: D.B. Weishampel et al. (eds.), 2004: 393 ("sensu Galton (1974a et seq.) may be").
Paraphyletic/Ancestral (para)		Ref: G. Olshevsky, 1991: 165 ("Parafamily").

Subsequent positions

†Hypsilophodontia (Infraorder) Cooper, 1985

Ref: P. Sereno, 1986: 252.

Current position

†Euornithopoda (Clade) Sereno 1986

Ref: M.J. Benton, 2005: 398.

Alternative positions

†Hypsilophodontia (Infraorder) Cooper, 1985	Ref: P. Sereno, 1986: 252. [new position]
†Ornithopoda (Order) Marsh, 1881	Ref: G. Olshevsky, 1991: 165.
†Ornithopoda (Suborder) Marsh, 1871	Ref: D. Lambert & the Diagram Group, 1991(1997): 109.

Historical positions

†Euornithopoda (Clade) Sereno 1986	Ref: M.J. Benton, 2005: 398, box 8.5.
†Ornithopoda (Suborder) Marsh, 1871	Ref: D. Lambert & the Diagram Group, 1991(1997): 109, 151.
†Ornithopoda (Suborder) Marsh, 1871	Ref: P. Uetz, [1995-]1996: 30 Dec 1996.
†Ornithopoda (Order) Marsh, 1881	Ref: G. Olshevsky, 1991: 165.
†Euornithopoda (Clade) Sereno 1986	Ref: M.J. Benton, 1990: fig. 1.5.
†Ornithopoda (Suborder) Marsh, 1871	Ref: B. Gardiner et al., 1989: 302.
†Ornithopoda (Suborder) Marsh, 1871	Ref: R.L. Carroll, 1988: App. (p. 622).
†Hypsilophodontia (Infraorder) Cooper, 1985	Ref: P. Sereno, 1986: 252. [new position]
†Ornithopoda (Suborder) Marsh, 1871	Ref: B. Grzimek et al., 1973 (1971): 596.

Number of Subtaxa

2026	Available in Systema Naturae 2000	†9g;1s
1989-present	Systema Naturae 2000	[; †[<]13g]
1991(1997)	D. Lambert & the Diagram Group: 151	[; †[<]13g]
1991	G. Olshevsky: 165	†17(13)g;25(20)s
1988	R.L. Carroll: App. (p. 622)	[; †9g]