Concise hierarchy

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

Subsequent positions

†Homalocephaloidea (Superfamily) Dong, 1978

Ref: P. Sereno, 1986: 252.

Original entries

†Homalocephale calathocercos T. Maryañska & H. Osmólska, 1974

Current position

†Pachycephalosauridae (Family) Sternberg, 1945

Ref: R.M. Sullivan, 2006: 353. [inferred name]

Alternative positions

†Homalocephalidae (Family) Dong, 1978	Ref: D. Lambert & the Diagram Group, 1991(1997)
†Homalocephaloidea (Superfamily) Dong, 1978	Ref: P. Sereno, 1986: 252. [new position]
†Pachycephalosauria (Clade) Maryañska & Osmólska 1974	Ref: P.C. Sereno, 1998: 68 (fig. 6).

Historical positions

†Pachycephalosauridae (Family) Sternberg, 1945	Ref: R.M. Sullivan, 2006: 353. [inferred name]
†Pachycephalosauria (Clade) Maryañska & Osmólska 1974	Ref: P.C. Sereno, 1998: 68 (fig. 6).
†Homalocephalidae (Family) Dong, 1978	Ref: G. Olshevsky, 1991: 159.
†Pachycephalosauridae (Family) Sternberg, 1945	Ref: B. Gardiner et al., 1989: 302.
†Homalocephalidae (Family) Dong, 1978	Ref: R.L. Carroll, 1988: App. (p. 622).
†Homalocephaloidea (Superfamily) Dong, 1978	Ref: P. Sereno, 1986: 252. [new position]

Number of Subtaxa

2026	Available in Systema Naturae 2000	†1s
1989-present	Systema Naturae 2000	[; †1s]
2006	R.M. Sullivan: 353	[; †1s]