Concise hierarchy

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

Included, by definition, in node-based clade

†Ornithopoda (Clade) Marsh 1881

Ref: P.C. Sereno, 1998: table 4 (p. 61).

Included, by definition, in branch-based clade

†Heterodontosauridae (Clade) Romer 1966

Ref: P.C. Sereno, 1998: table 4 (p. 61).

Excluded, by definition, from branch-based clade

†Euornithopoda (Clade) Sereno 1986

Ref: P.C. Sereno, 1998: table 4 (p. 61).

Subsequent positions

†Xiphosauridae (Family) Sereno, 1986, nom. inval.

Ref: P. Sereno, 1986: 252.

Current position

†Heterodontosauridae (Family) Kuhn, 1966

Ref: D. Lambert & the Diagram Group, 1991(1997): 150.

Alternative positions

†Xiphosauridae (Family) Sereno, 1986, nom. inval.

Ref: P. Sereno, 1986: 252. [new position]

Historical positions

Dinosauria (Clade) Owen 1841 [Padian & May 1993], nom. cl. inval.	Ref: C.F. Kammerer et al., 2012(2011): 282 (fig. 4). [rough position]
†Ornithischia (Clade) Seeley 1887 [Padian & May 1993]	Ref: S.J. Nesbitt, 2011: fig. 52.
†Heterodontosauridae (Family) Kuhn, 1966	Ref: D. Lambert & the Diagram Group, 1991(1997): 150.
†Heterodontosauridae (Family) Kuhn, 1966	Ref: G. Olshevsky, 1991: 158.
†Heterodontosauridae (Family) Kuhn, 1966	Ref: B. Gardiner et al., 1989: 302.
†Heterodontosauridae (Family) Kuhn, 1966	Ref: R.L. Carroll, 1988: App. (p. 622).
†Xiphosauridae (Family) Sereno, 1986, nom. inval.	Ref: P. Sereno, 1986: 252. [new position]

Number of Subtaxa

2026	Available in Systema Naturae 2000	†1s;1
1989-present	Systema Naturae 2000: 29 Nov 2023	[; †1s]