Eotriceratops

Eotriceratops; Temporal range: Late Cretaceous (Middle Maastrichtian-?Latest Maastrichtian),
	Skull reconstruction of Eotriceratops xerinsularis.
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Reptilia
Order:	†Ornithischia
Family:	†Ceratopsidae
Subfamily:	†Chasmosaurinae
Tribe:	†Triceratopsini
Genus:	†Eotriceratops; Wu et al, 2006
Type species
	†Eotriceratops xerinsularis; Wu et al., 2006
Species
	†E. xerinsularis Wu et al., 2006; †?E. fowleri Sullivan & Lucas, 2010;
Synonyms
	List Ojoceratops fowleri? Sullivan & Lucas, 2010 ; "Triceratops xerinsularis"? Sullivan & Lucas, 2010 ; List Ojoceratops fowleri? Sullivan & Lucas, 2010 ;

Eotriceratops (meaning "dwan three-horned face) is an extinct genus of ceratopsian that lived in Alberta, in Canada and in Mexico. The type species is the Eotriceratops xerinsularis, he is the only formely named species. A possible second species, the Eotriceratops fowleri is a probably junior synonym or not belongs to same genus and probably a separate taxon, the Ojoceratops, but are in debate. The Eotriceratops lived in Late Cretaceous, between 68.8 to 66.5 milion years ago.

The Eotriceratops coexisted with the large theropod Tyrannosaurid called as Albertosaurus, the famous Ceratopsids Triceratops, your possible synonym Ojoceratops, Nedoceratops and the Torosaurus from example.

Description

The Eotriceratops is estimates in 8.5–9.02 meters (28–30 ft) in lenght, measuring 3 m (10 ft) in height and 9–11 tons (12 short tons) in body mass.^[1] The other possible second species E. fowleri is estimates in 5–6 meters (16.4–19.7 ft) in lenght, and 2.2 tons (3 short tons) in body mass.^[2]^[3] But, this second species was not been confirmed and is probably a indeterminate Ceratopsid, a synonym or belongs to a distinct species.

The Eotriceratops is very similar to Triceratops, Torosaurus and Nedoceratops, showing a very close relationship between these three species.^[1]

References

↑ ^1.0 ^1.1 Wu, Xiao-chun; Brinkman, Donald B; Eberth, David A; Braman, Dennis R (2007-09). "A new ceratopsid dinosaur (Ornithischia) from the uppermost Horseshoe Canyon Formation (upper Maastrichtian), Alberta, Canada". Canadian Journal of Earth Sciences. 44 (9): 1243–1265. doi:10.1139/e07-011. ISSN 0008-4077. {{cite journal}}: Check date values in: |date= (help)
↑ Maiorino, Leonardo; Farke, Andrew A.; Kotsakis, Tassos; Teresi, Luciano; Piras, Paolo (2015-11). "Variation in the shape and mechanical performance of the lower jaws in ceratopsid dinosaurs (Ornithischia, Ceratopsia)". Journal of Anatomy. 227 (5): 631–646. doi:10.1111/joa.12374. ISSN 1469-7580. PMC 4609198. PMID 26467240. {{cite journal}}: Check date values in: |date= (help)
↑ "(PDF) The Kirtlandian land-vertebrate "age"-faunal composition, temporal position and biostratigraphic correlation in the nonmarine Upper Cretaceous of western North America". ResearchGate. Retrieved 2025-09-25.

[:0-1] 1.0 ^1.1 Wu, Xiao-chun; Brinkman, Donald B; Eberth, David A; Braman, Dennis R (2007-09). "A new ceratopsid dinosaur (Ornithischia) from the uppermost Horseshoe Canyon Formation (upper Maastrichtian), Alberta, Canada". Canadian Journal of Earth Sciences. 44 (9): 1243–1265. doi:10.1139/e07-011. ISSN 0008-4077. {{cite journal}}: Check date values in: |date= (help)

[2] Maiorino, Leonardo; Farke, Andrew A.; Kotsakis, Tassos; Teresi, Luciano; Piras, Paolo (2015-11). "Variation in the shape and mechanical performance of the lower jaws in ceratopsid dinosaurs (Ornithischia, Ceratopsia)". Journal of Anatomy. 227 (5): 631–646. doi:10.1111/joa.12374. ISSN 1469-7580. PMC 4609198. PMID 26467240. {{cite journal}}: Check date values in: |date= (help)

[3] "(PDF) The Kirtlandian land-vertebrate "age"-faunal composition, temporal position and biostratigraphic correlation in the nonmarine Upper Cretaceous of western North America". ResearchGate. Retrieved 2025-09-25.

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