Reptilia - Ornithischia - Ceratopsidae
Full reference: S. D. Sampson. 1994. Two new horned dinosaurs (Ornithischia: Ceratopsidae) from the Upper Cretaceous Two Medicine Formation, Montana, USA. Journal of Vertebrate Paleontology 14(3, suppl.):44A
Parent taxon: Pachyrhinosaurini according to M. J. Ryan et al. 2017
See also Dodson 1997, Dodson et al. 2004, Evans and Ryan 2015, Farke 2004, Farke et al. 2011, Fiorillo and Tykoski 2012, Horner et al. 2001, Longrich 2010, McDonald 2011, McDonald and Horner 2010, Ryan 2007, Ryan and Russell 2005, Sampson 1994, Sampson 1995, Vickaryous and Ryan 1997 and Xu et al. 2010
Sister taxa: Einiosaurus, Pachyrhinosaurus, Pachyrostra
Subtaxa: Achelousaurus horneri
Type: Achelousaurus horneri
Ecology: ground dwelling herbivore
Distribution:
• Cretaceous of United States (2: Montana collections)
Total: 2 collections each including a single occurrence
Specimen images are retrieved through the ePANDDA API.