Vagaceratops irvinensis Holmes et al. 2001

Reptilia - Ornithischia - Ceratopsidae

Alternative combination: Chasmosaurus irvinensis

Synonyms: Mercuriceratops gemini Ryan et al. 2014, Pentaceratops aquilonius Longrich 2014

Full reference: R. B. Holmes, C. A. Forster, M. J. Ryan and K. M. Shepherd. 2001. A new species of Chasmosaurus (Dinosauria: Ceratopsia) from the Dinosaur Park Formation of southern Alberta. Canadian Journal of Earth Sciences 38:1423-1438

Belongs to Vagaceratops according to A. A. Farke et al. 2011

See also Campbell et al. 2016, Campione and Holmes 2006, Currie 2005, Diem and Archibald 2005, Dodson et al. 2004, Eberth and Evans 2011, Evans et al. 2014, Farke 2007, Holmes 2014, Holmes et al. 2001, Holmes and Organ 2007, Holmes and Ryan 2013, Konishi 2015, Loewen et al. 2013, Longrich 2008, Longrich 2010, Longrich 2014, Lucas et al. 2006, Maidment and Barrett 2011, Mallon et al. 2022, Mallon et al. 2016, Ryan 2007, Ryan and Evans 2005, Ryan et al. 2012, Ryan et al. 2014, Ryan et al. 2010 and Sampson et al. 2010

Sister taxa: none

Type specimens:

  • Vagaceratops irvinensis: NMC 41357, a skeleton. Its type locality is Southwest of Irvine (NMC), which is in a Campanian terrestrial horizon in the Dinosaur Park Formation of Canada.
  • Mercuriceratops gemini: ROM 64222, a partial skull (Near complete right squamosal). Its type locality is Fergus County (general), which is in a Campanian terrestrial horizon in the Judith River Formation of Montana.
  • Pentaceratops aquilonius: CMN 9813, a partial skull. Its type locality is NMC Loc. P-3706, Milk River, which is in a Campanian estuary/bay horizon in the Dinosaur Park Formation of Canada.


• Cretaceous of Canada (6: Alberta collections), United States (1: Montana)

Total: 7 collections each including a single occurrence

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Specimen images are retrieved through the ePANDDA API.

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