Concise hierarchy

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

Phylogeny

Node-based clade

Ref: P.C. Sereno, 1998: table 4 (p. 62).

Defined by the most recent common ancestor (and all its descendants) of

†Pachycephalosaurus (Genus) Brown & Schlaikjer, 1943		Ref: P.C. Sereno, 1998: table 4 (p. 62).
†Triceratops (Genus) Marsh, 1889		Ref: P.C. Sereno, 1998: table 4 (p. 62).

Current position

†Cerapoda (Suborder) Sereno, 1986

Ref: M.J. Benton, 2005: box 8.5.

Alternative positions

†Cerapoda ([unranked]) Sereno, 1986	Ref: M.J. Benton, 1990: fig. 1.5.
†Neornithischia (Clade) Cooper 1985	Ref: P.C. Sereno, 1998: table 4 (p. 62).

Historical positions

†Cerapoda (Suborder) Sereno, 1986	Ref: M.J. Benton, 2005: box 8.5.
†Neornithischia (Clade) Cooper 1985	Ref: P.C. Sereno, 1998: table 4 (p. 62), figs. 4, 6.
†Cerapoda ([unranked]) Sereno, 1986	Ref: M.J. Benton, 1990: fig. 1.5.

Number of Subtaxa

2025	Available in Systema Naturae 2000	†4f;25g;20s
1989-present	Systema Naturae 2000	[; †5f;44g]