Concise hierarchy

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

Phylogeny

Paraphyletic/Ancestral (para)

Ref: D.B. Norman et al., 2004: 333.

Current position

†Ornithischia (Order) Seeley, 1887

Ref: M.J. Benton, 2005: 397.

Alternative positions

†Ornithopoda (Suborder) Marsh, 1871	Ref: R.L. Carroll, 1988: App. (p. 621).
†Thyreophora (Suborder) Nopcsa, 1915	Ref: M.J. Benton, 2005: 397; Benton, 2015: box 8.1 (p. 209). [indirect]

Historical positions

†Ornithischia (Order) Seeley, 1887	Ref: M.J. Benton, 2005: 397, box 8.5.
†Ornithischia (Order) Seeley, 1887	Ref: D. Lambert & the Diagram Group, 1991(1997): 109.
†Ornithopoda (Suborder) Marsh, 1871	Ref: B. Gardiner et al., 1989: 302.
†Ornithopoda (Suborder) Marsh, 1871	Ref: R.L. Carroll, 1988: App. (p. 621).

Number of Subtaxa

2026	Available in Systema Naturae 2000	†7g
1989-present	Systema Naturae 2000	†8g
1988	R.L. Carroll: App. (p. 621)	[; †7g]