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Pachycephalosaurid

Pachycephalosaurs
Temporal range: Late Cretaceous, 90–66 Ma
Pachycephalosaurus skull.JPG
Cast of a Pachycephalosaurus wyomingensis skull, Oxford University Museum of Natural History
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Reptilia
Clade: Dinosauria
Order: Ornithischia
Suborder: Pachycephalosauria
Maryańska & Osmólska, 1974
Family: Pachycephalosauridae
Sternberg, 1945
(conserved name)
Type species
Troodon wyomingensis
Gilmore, 1931 (conserved name)
Genera

See text

Synonyms

Homalocephalidae Dong, 1978


See text

Homalocephalidae Dong, 1978

Pachycephalosauria (/ˌpækiˌsɛfələˈsɔːriə, ˌkɛ-/; from Greek παχυκεφαλόσαυρος for 'thick headed lizards') is a clade of ornithischian dinosaurs. Genera include Pachycephalosaurus, Stegoceras, and Prenocephale. Most lived during the Late Cretaceous Period, in what is now North America and Asia. They were all bipedal, herbivorous/omnivorous animals with thick skulls. In some fossils, the skull roof is domed and several centimeters thick; in others it is flat or wedge-shaped. While the flat-headed pachycephalosaurs are traditionally regarded as distinct species or even families, they may actually represent juveniles of dome-headed adults. The domes were often surrounded by nodes and/or spikes.


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Wikipedia

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