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Monotypic taxon: Genus †Pachycephalosaurus Brown & Schlaikjer, 1943, nom. cons. (dinosaur)
 Entity: 

Authorship

SN2000 author citation:  B. Brown & Schlaikjer, 1943, nom. cons.
Original name:  Brown, B. & Schlaikjer, E.M. 1943. Bull. Amer. Mus. Nat. Hist. 82 (5): 132.

Etymology

Greek παχυς, thick. Ref: Wikimedia, 2001-present: 20 Jun 2016.
Greek κεφαλη, head. Ref: Wikimedia, 2001-present: 20 Jun 2016.
Greek (subst. masc.) σαύρος (gen.: σαύρου), a lizard. Ref: Wikimedia, 2001-present: 20 Jun 2016.

Attributes

Conserved spelling (orth. cons. [prop.]) [ICZN, 1999: Art. 81.1] Ref: G. Olshevsky, 1991. Mesozoic Meanderings (no. 2): 159 ("nomen conservandum").

Types

Type of: †Pachycephalosauridae (Family) Sternberg, 1945 Ref: R.L. Carroll, 1988: App. (p. 622); 15 Oct 2025. [inferred]
Type of: †Pachycephalosaurini (Tribe) Sullivan, 2003
Type: †Pachycephalosaurus wyomingensis (Gilmore, 1931) Brown & Schlaikjer, 1943

Synonyms

Synonymous name: †Dracorex (Genus) Bakker, R. Sullivan, Porter, P. Larson & Saulsbury, 2006 Ref: PBDB: 27 Oct 2013; PBDB[5 Jun 2025].
Synonymous name: †Stenotholus (Genus) Giffin, Gabriel & Johnson, 1988 Ref: PBDB: 27 Oct 2013; PBDB[5 Jun 2025].
Synonymous name: †Stygimoloch (Genus) Galton & Sues, 1983 Ref: PBDB: 4 Apr 2017; PBDB[5 Jun 2025].
Including: †Tylosteus (Genus) Leidy, 1872, nom. oblit. Ref: D.B. Weishampel et al. (eds.), 1990: 566.
In (pro parte): †Troödon (Genus) Leidy, 1856 Ref: R.M. Sullivan, 2006: 357.
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Last updated: 28 Aug 2026