Ojoceratops ( meaning "Ojo Alamo horned face") is a genus of ceratopsian dinosaur which lived in what is now New Mexico, United States. Ojoceratops fossils have been recovered from strata of the Ojo Alamo Formation (Naashoibito Member), dating to the late Cretaceous period (probably Maastrichtian age, 68 million years ago[1]). The type species is Ojoceratops fowleri.
| Ojoceratops Temporal range: Late Cretaceous,
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Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Clade: | Dinosauria |
| Clade: | †Ornithischia |
| Clade: | †Ceratopsia |
| Family: | †Ceratopsidae |
| Subfamily: | †Chasmosaurinae |
| Tribe: | †Triceratopsini |
| Genus: | †Ojoceratops Sullivan & Lucas, 2010 |
| Type species | |
| †Ojoceratops fowleri Sullivan & Lucas, 2010
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Classification edit
It is very similar to its close relative Triceratops, though it is from an earlier time period and has a more squared-off frill.[2] Nick Longrich, in 2011, noted that the squared-off frill is also found in some true Triceratops specimens and that Ojoceratops is probably a junior synonym of Triceratops,[3] while Holtz (2010) noted that it is probably ancestral to Triceratops and possibly synonymous with the contemporary Eotriceratops.[4] However, Jasinski et al. (2011) argued that the genus is valid on the basis of other diagnostic features not recognized by Longrich (2011), including the parietal bar not seen in any Triceratops specimens, the wide arched squamosal, enlarged base, etc.[5] Maiorino et al. (2015) also considered Ojoceratops as a valid taxon in their phylogenetic analysis.[6] Cladistic analyses revealed that Regaliceratops is in a polytomy with Ojoceratops and Eotriceratops.[7]
See also edit
References edit
- ^ Sullivan, R.M., and Lucas, S.G. 2006. "The Kirtlandian land-vertebrate "age" – faunal composition, temporal position and biostratigraphic correlation in the nonmarine Upper Cretaceous of western North America[permanent dead link]." New Mexico Museum of Natural History and Science, Bulletin 35:7-29.
- ^ Robert M. Sullivan and Spencer G. Lucas, 2010, "A New Chasmosaurine (Ceratopsidae, Dinosauria) from the Upper Cretaceous Ojo Alamo Formation (Naashoibito Member), San Juan Basin, New Mexico", In: Ryan, M.J., Chinnery-Allgeier, B.J., and Eberth, D.A. (eds.) New Perspectives on Horned Dinosaurs: The Royal Tyrrell Museum Ceratopsian Symposium, Bloomington, Indiana University Press, 656 pp.
- ^ Nicholas R. Longrich (2011). "Titanoceratops ouranos, a giant horned dinosaur from the Late Campanian of New Mexico". Cretaceous Research. 32 (3): 264–276. doi:10.1016/j.cretres.2010.12.007.
- ^ Holtz, Thomas R. Jr. (2011) Dinosaurs: The Most Complete, Up-to-Date Encyclopedia for Dinosaur Lovers of All Ages, Winter 2010 Appendix.
- ^ Jasinski, S.E.; Sullivan, R.M.; Lucas, S.G. (2011). "Taxonomic composition of the Alamo Wash local fauna from the Upper Cretaceous Ojo Alamo Formation (Naashoibito Member) San Juan Basin, New Mexico". New Mexico Museum of Natural History and Science Bulletin 53: 216–271.
- ^ Maiorino, L.; Farke, A.A.; Kotsakis, T.; Teresi, L.; Piras, P. (2015). "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.
- ^ Brown, Caleb M.; Henderson, Donald M. (June 4, 2015). "A new horned dinosaur reveals convergent evolution in cranial ornamentation in Ceratopsidae". Current Biology. 25 (12): 1641–8. doi:10.1016/j.cub.2015.04.041. PMID 26051892.
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