Pachycephalosaurus

Pachycephalosaurus; Temporal range: Late Cretaceous (Maastrichtian), 70–66 Ma PreꞒ Ꞓ O S D C P T J K Pg N ↓
	Cast of the "Sandy" specimen, Royal Ontario Museum
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Clade:	Dinosauria
Order:	†Ornithischia
Suborder:	†Pachycephalosauria
Family:	†Pachycephalosauridae
Tribe:	†Pachycephalosaurini
Genus:	†Pachycephalosaurus; Brown & Schlaikjer, 1943
Type species
	†Troodon wyomingensis; Gilmore, 1931
Species
	†P. wyomingensis ; (Gilmore, 1931) (conserved name); †P. spinifer? ; (Galton & Sues, 1983);
Synonyms
	List Tylosteus ornatus; Leidy, 1872 (rejected name) ; Troodon wyomingensis; Gilmore, 1931 ; Pachycephalosaurus grangeri; Brown & Schlaikjer, 1943 ; Pachycephalosaurus reinheimeri; Brown & Schlaikjer, 1943 ; Stenotholus kohleri; Giffin, Gabriel & Johnson, 1988 ; Stygimoloch spinifer?; Galton & Sues, 1983 ; Dracorex hogwartsia?; Bakker et al., 2006 ;

Pachycephalosaurus was a genus of dinosaur which lived during the last five million years of the Upper Cretaceous. It lived in what is now North America.^[2]

This member of the Pachycephalosaurid family is known from a single skull and a few thick skull roofs. From this it is estimated that its length was about 4.5 to 5 metres long (about 15 feet).

Pachycephalosaurus was a herbivore. It lived on a mixed diet of leaves, seeds, and fruit. The sharp, serrated teeth would have been very effective for shredding plants.^[3]

References

↑ Giffin, Emily B.; Gabriel, Diane L.; Johnson, Rolf E. (22 January 1988). "A New Pachycephalosaurid Hell Creek Formation of Montana". Journal of Vertebrate Paleontology. 7 (4). Taylor & Francis, Ltd.: 398–407. doi:10.1080/02724634.1988.10011672. JSTOR 4523163. Retrieved 13 November 2020.
↑ Giffin, Emily B; Gabriel, Diane L; Johnson Rolf E. 1988. A new Pachycephalosaurid: Hell Creek Formation of Montana. Journal of Vertebrate Paleontology. 7 (4): 398–407.
↑ The dinosauria (2nd ed.). Berkeley, Calif.: University of California Press. 2004. ISBN 978-0-520-94143-4. OCLC 801843269.

[1] Giffin, Emily B.; Gabriel, Diane L.; Johnson, Rolf E. (22 January 1988). "A New Pachycephalosaurid Hell Creek Formation of Montana". Journal of Vertebrate Paleontology. 7 (4). Taylor & Francis, Ltd.: 398–407. doi:10.1080/02724634.1988.10011672. JSTOR 4523163. Retrieved 13 November 2020.

[2] Giffin, Emily B; Gabriel, Diane L; Johnson Rolf E. 1988. A new Pachycephalosaurid: Hell Creek Formation of Montana. Journal of Vertebrate Paleontology. 7 (4): 398–407.

[MCW04-3] The dinosauria (2nd ed.). Berkeley, Calif.: University of California Press. 2004. ISBN 978-0-520-94143-4. OCLC 801843269.

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