Reptilia - Ornithischia

Alternative combination: Troodon wyomingensis

Synonyms: Dracorex hogswartsia Bakker et al. 2006, Dracorex hogwartsi Bakker et al. 2006, Dracorex hogwartsia Bakker et al. 2006, Pachycephalosaurus grangeri Brown and Schlaikjer 1943, Pachycephalosaurus reinheimeri Brown and Schlaikjer 1943, Stenotholus kohleri Giffin et al. 1988, Stenotholus kohlerorum Giffin et al. 1988, Stygimoloch spinifer Galton and Sues 1983, Tylosteus ornatus Leidy 1872

Belongs to Pachycephalosaurus according to R. M. Sullivan 2006

See also Bakker et al. 2006, Bohlin 1953, Breithaupt 1985, Breithaupt 1999, Brown and Schlaikjer 1943, Butler et al. 2008, Charig 1967, Derstler 1994, Dieudonné et al. 2020, Evans et al. 2018, Galton 1971, Galton and Sues 1983, Giffin 1989, Giffin et al. 1988, Gilmore 1936, Goodwin et al. 1998, Goodwin and Evans 2016, Han et al. 2012, Hay 1902, Hay 1930, Kuhn 1964, Lehman 2010, Leidy 1872, Leidy 1873, Longrich et al. 2010, Mallon et al. 2015, Maryanska 1990, Maryanska et al. 2004, Maryańska and Osmólska 1974, McIntosh 1981, Olshevsky 1991, Olshevsky and Ford 1994, Ostrom 1965, Sakagami and Kawabe 2020, Schott et al. 2009, Schott and Evans 2017, Sues 1997, Sues and Galton 1987, Sullivan 2003, Vickaryous and Ryan 1997, Wall and Galton 1979, Williamson and Carr 2003, Williamson and Carr 2006, Williamson et al. 2009 and Woodruff et al. 2021

Sister taxa: none

Type specimens:

• Pachycephalosaurus wyomingensis: USNM 12031, a skull. Its type locality is 9 miles southwest of Warren Post Office, which is in a Maastrichtian terrestrial horizon in the Lance Formation of Wyoming.
• Dracorex hogwartsia: TCMI 2004.17.1, a partial skeleton. Its type locality is Dracorex type site, which is in a Maastrichtian terrestrial horizon in the Hell Creek Formation of South Dakota.
• Pachycephalosaurus grangeri: AMNH 1696, a skull. Its type locality is William Winkley Ranch, Powder Hill, which is in a Maastrichtian terrestrial horizon in the Hell Creek Formation of Montana.
• Pachycephalosaurus reinheimeri: DMNH 469, a skull. Its type locality is Twito ranch (DMNH), which is in a Maastrichtian terrestrial horizon in the Lance Formation of South Dakota.
• Stenotholus kohleri: UCMP 110433. Its type locality is MPM locality 3850 (Hell Creek Formation), which is in a Maastrichtian channel sandstone/siltstone in the Hell Creek Formation of Montana.
• Stygimoloch spinifer: UCMP 110433, a skull. Its type locality is Harbicht Hill South No. 2, UCMP V-73100, which is in a Maastrichtian terrestrial horizon in the Hell Creek Formation of Montana.
• Tylosteus ornatus: ANSP 8568, a partial skull.

Distribution:

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Specimen images are retrieved through the ePANDDA API.