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Mojoceratops perifania, a new chasmosaurine ceratopsid from the late Campanian of Western Canada

Published online by Cambridge University Press:  20 May 2016

Nicholas R. Longrich
Nicholas R. Longrich*
Affiliation:
Department of Geology, Yale University, New Haven, Connecticut 06520, USA,
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Abstract

A new genus of long-horned chasmosaurine ceratopsid is described from the Dinosaur Park Formation (upper Campanian) of Western Canada. Mojoceratops perifania is represented by a skull and a parietal from the Dinosaur Park Formation of Alberta and an isolated parietal from the Dinosaur Park Formation of Saskatchewan. Several other specimens are provisionally referred to this taxon. While Mojoceratops shares many plesiomorphies with Chasmosaurus, the animal lacks the forward-curving parietal epoccipitals and reduced postorbital horns that diagnose the genus Chasmosaurus, and it differs from all other chasmosaurines in exhibiting a prominent sulcus on the anterior margin of the parietal, swellings on the anterodorsal surface of the parietal rami, and a small accessory process on the first parietal epoccipital. Other unusual features include anteriorly extended parietal fenestrae, a broad, heart-shaped frill, and transverse expansion of the postfrontal fontanelle. The type material of “Eoceratops canadensis” and “Chasmosaurus kaiseni” are nondiagnostic and these names are therefore considered nomina dubia, but their morphology is consistent with Mojoceratops and they probably belong to this genus. The frill of Mojoceratops shows marked variation. Some of this variation probably results from intraspecific variation or ontogenetic changes, but because the Dinosaur Park Formation encompasses more than a million years of time, evolution may explain some of these differences. Phylogenetic analysis shows that Mojoceratops forms a clade with Agujaceratops mariscalensis; Chasmosaurus is the most basal member of Chasmosaurinae.

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Type
Research Article
Information
Journal of Paleontology , Volume 84 , Issue 4 , July 2010 , pp. 681 - 694
Copyright
Copyright © The Paleontological Society

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References

Brinkman, D. B. 1990. Paleoecology of the Judith River Formation (Campanian) of Dinosaur Provincial Park, Alberta, Canada: Evidence from vertebrate microfossil localities. Palaeogeography, Palaeoclimatology, Palaeoecology, 78:37–54.CrossRefGoogle Scholar
Brinkman, D. B. 2003. A review of nonmarine turtles from the Late Cretaceous of Alberta. Canadian Journal of Earth Sciences, 40:557–571.CrossRefGoogle Scholar
Brinkman, D. B. 2005. Turtles: diversity, paleoecology, and distribution, p. 202–220. In Currie, P. J. and Koppelhus, E. B. (eds.), Dinosaur Provincial Park: A Spectacular Ancient Ecosystem Revealed, Bloomington: Indiana University Press.Google Scholar
Brown, B. 1914. Anchiceratops, a new genus of horned dinosaur from the Edmonton Cretaceous of Alberta. Bulletin of the American Museum of Natural History, 33:539–548.Google Scholar
Brown, B. 1933. A new longhorned Belly River ceratopsian. American Museum Novitates, 669:1–3.Google Scholar
Brown, B. and Schlaikjer, E. M. 1940. The structure and relationships of Protoceratops. Annals of the New York Academy of Sciences, 40:133–266.CrossRefGoogle Scholar
Caldwell, M. W. 2005. The squamates: origins, phylogeny, and paleoecology, p. 235–248. In Currie, P. J. and Koppelhus, E. B. (eds.), Dinosaur Provincial Park: A Spectacular Ancient Ecosystem Revealed, Bloomington: Indiana University Press.Google Scholar
Currie, P. J. 2005. Theropods, including birds, p. 367–397. In Currie, P. J. and Koppelhus, E. B. (eds.), Dinosaur Provincial Park: A Spectacular Ancient Ecosystem Revealed. Indiana University Press, Bloomington.Google Scholar
Currie, P. J. and Russell, D. A. 2005. The geographic and stratigraphic distribution of articulated and associated dinosaur remains, p. 202–220. In Currie, P. J. and Koppelhus, E. B. (eds.), Dinosaur Provincial Park: A Spectacular Ancient Ecosystem Revealed, Bloomington: Indiana University Press.Google Scholar
Dodson, P. 1971. Sedimentology and taphonomy of the Oldman Formation (Campanian), Dinosaur Provincial Park, Alberta (Canada). Palaeogeography, Palaeoclimatology, Palaeoecology, 10:21–74.CrossRefGoogle Scholar
Eberth, D. A. 2005. The Geology, p. 54–82. In Currie, P. J. and Koppelhus, E. B. (eds.), Dinosaur Provincial Park: a spectacular ancient ecosystem revealed. Indiana University Press, Bloomington.Google Scholar
Eberth, D. A. and Brinkman, D. B. 1997. Paleoecology of an estuarine, incised-valley fill in the Dinosaur Park Formation (Judith River Group, Upper Cretaceous) of southern Alberta, Canada. Palaios, 12(1):43–58.CrossRefGoogle Scholar
Forster, C. A. 1996a. New information on the skull of Triceratops. Journal of Vertebrate Paleontology, 16(2):246–258.CrossRefGoogle Scholar
Forster, C. A. 1996b. Species resolution in Triceratops: cladistic and morphometric approaches. Journal of Vertebrate Paleontology, 16(2):259–270.CrossRefGoogle Scholar
Forster, C. A., Sereno, P. C., Evans, T. W., and Rowe, T. 1993. A complete skull of Chasmosaurus mariscalensis (Dinosauria: Ceratopsidae) from the Aguja Formation (Late Campanian) of West Texas. Journal of Vertebrate Paleontology, 13(2):161–170.CrossRefGoogle Scholar
Fox, R. C. 2005. Late Cretaceous mammals, p. 417–435. In Currie, P. J. and Koppelhus, E. B. (eds.), Dinosaur Provincial Park: a spectacular ancient ecosystem revealed. Indiana University Press, Bloomington.Google Scholar
Gao, K.-Q. and Brinkman, D. B. 2005. Choristoderes from the park and its vicinity, p. 221–234. In Currie, P. J. and Koppelhus, E. B. (eds.), Dinosaur Provincial Park: a spectacular ancient ecosystem revealed. Indiana University Press, Bloomington.Google Scholar
Gardner, J. D. 2005. Lissamphibians, p. 186–201. In Currie, P. J. and Koppelhus, E. B. (eds.), Dinosaur Provincial Park: a spectacular ancient ecosystem revealed. Indiana University Press, Bloomington.Google Scholar
Eberth, D. A. and Getty, M. A. 2005. Ceratopsian bonebeds: occurrence, origins, and significance, p. 501–536. In Currie, P. J. and Koppelhus, E. B. (eds.), Dinosaur Provincial Park: a spectacular ancient ecosystem revealed, Bloomington: Indiana University Press.Google Scholar
Godfrey, S. J. and Holmes, R. B. 1995. Cranial morphology and systematics of Chasmosaurus (Dinosauria: Ceratopsidae) from the Upper Cretaceous of Western Canada. Journal of Vertebrate Paleontology, 15(4):726–742.CrossRefGoogle Scholar
Holmes, R. B., Forster, C., Ryan, M., and Shephard, K. M. 2001. A new species of Chasmosaurus (Dinosauria: Ceratopsia) from the Dinosaur Park Formation of southern Alberta. Canadian Journal of Earth Sciences, 38:1423–1438.CrossRefGoogle Scholar
Hope, S. 2002. The Mesozoic record of Neornithes (modern birds), p. 339–388. In Chiappe, L. M. and Witmer, L. M. (eds.), Mesozoic Birds: Above the Heads of Dinosaurs. University of California Press.Google Scholar
Horner, J. R. and Goodwin, M. B. 2006. Major cranial changes during Triceratops ontogeny. Proceedings of the Royal Society B, 273:2757–2761.CrossRefGoogle ScholarPubMed
Horner, J. R. and Goodwin, M. B. 2008. Ontogeny of cranial epiossifications in Triceratops. Journal of Vertebrate Paleontology, 28(1):134–144.CrossRefGoogle Scholar
Koppelhus, E. B. 2005. Paleobotany, p. 131–138. In Currie, P. J. and Koppelhus, E. B. (eds.), Dinosaur Provincial Park: A Spectacular Ancient Ecosystem Revealed. Indiana University Press, Bloomington.Google Scholar
Lambe, L. M. 1902. On vertebrata of the Mid-Cretaceous of the Northwest Territory, Pt. 2. New genera and species from the Belly River Series (Mid-Cretaceous). Canada Geological Survey, Contributions to Canadian Paleontology, 3:25–81.Google Scholar
Lambe, L. M. 1904. On the squamoso-parietal crest of two species of horned dinosaurs from the Cretaceous of Alberta. Ottawa Naturalist, 8:81–84.Google Scholar
Lambe, L. 1914. On Gryposaurus notabilis, a new genus and species of trachodont dinosaur from the Belly River Formation of Alberta, with a description of the skull of Chasmosaurus belli. The Ottawa Naturalist, 27(11):145–155.Google Scholar
Lambe, L. 1915. On Eoceratops canadensis, gen. nov., with remarks on other genera of Cretaceous horned dinosaurs. Canada Geological Survey, Museum Bulletin, 12:1–49.Google Scholar
Lehman, T. M. 1989. Chasmosaurus mariscalensis, sp. nov., a new ceratopsian dinosaur from Texas. Journal of Vertebrate Paleontology, 9(2):137–162.CrossRefGoogle Scholar
Lehman, T. M. 1990. The ceratopsian subfamily Chasmosaurinae: sexual dimorphism and systematics, p. 211–230. In Currie, P. J. and Carpenter, K. (eds.), Dinosaur Systematics: Approaches and Perspectives. Cambridge University Press, Cambridge.CrossRefGoogle Scholar
Lehman, T. M. 1993. New data on the ceratopsian dinosaur Pentaceratops sternbergii Osborn from New Mexico. Journal of Paleontology, 67(2):279–288.CrossRefGoogle Scholar
Longrich, N. 2006. An ornithurine bird from the Late Cretaceous of Alberta, Canada. Canadian Journal of Earth Sciences, 43:1–7.CrossRefGoogle Scholar
Longrich, N. R. 2008. A new, large ornithomimid from the Dinosaur Park Formation of Alberta, Canada: implications for the study of dissociated dinosaur remains. Palaeontology, 51(4):983–997.CrossRefGoogle Scholar
Longrich, N. R. 2009. An ornithurine-dominated avifauna from the Belly River Group (Campanian, Upper Cretaceous) of Alberta, Canada. Cretaceous Research, 30:161–177.CrossRefGoogle Scholar
Longrich, N. R. and Currie, P. J. 2009. A microraptorine (Dinosauria-Dromaeosauridae) from the Late Cretaceous of North America. Proceedings of the National Academy of Sciences.CrossRefGoogle Scholar
Lull, R. S. 1905. Restoration of the horned dinosaur Diceratops. American Journal of Science, 20:420–422.CrossRefGoogle Scholar
Lull, R. S. 1933. A revision of the Ceratopsia or horned dinosaurs. Memoirs of the Peabody Museum, 3:1–175.Google Scholar
Maddison, W. P. and Maddison, D. R. 2005. MacClade 4.08. Sinauer Associates, Sunderland, Massachusetts.Google Scholar
Marsh, O. C. 1888. A new family of horned dinosaurs from the Cretaceous. American Journal of Science, Series 3, 36:477–478.CrossRefGoogle Scholar
Marsh, O. C. 1890. Additional characters of the Ceratopsidae, with notice of new Cretaceous dinosaurs. American Journal of Science, 39:418–426.CrossRefGoogle Scholar
Marsh, O. C. 1892. The skull of Torosaurus. American Journal of Science, 43(253):81–84.CrossRefGoogle Scholar
Møller, A. P. and Höglund, J. 1991. Patterns of fluctuating asymmetry in avian feather ornaments: implications for models of sexual selection. Proceedings of the Royal Society B, 245(1312):1–5.Google Scholar
Møller, A. P. 1992. Patterns of fluctuating asymmetry in weapons: evidence for reliable signalling of quality in beetle horns and bird spurs. Proceedings of the Royal Society B, 248:199–206.Google Scholar
Neuman, A. G. and Brinkman, D. B. 2005. Fishes of the Fluvial Beds, p. 167–185. In Currie, P. J. and Koppelhus, E. B. (eds.), Dinosaur Provincial Park: a spectacular ancient ecosystem revealed. Indiana University Press, Bloomington.Google Scholar
Norell, M. A., Gaffney, E. S., and Dingus, L. 1995. Discovering Dinosaurs in the American Museum of Natural History. Alfred A. Knopf, New York.Google Scholar
Osborn, H. F. 1923. A new genus of Ceratopsia from New Mexico, Pentaceratops sternbergii. American Museum Novitates, 93:3.Google Scholar
Owen, R. 1842. Report on British fossil reptiles. Part II. Report of the British Association for the Advancement of Science, 11:60–204.Google Scholar
Ryan, M. J. and Russell, A. P. 2001. Dinosaurs of Alberta (exclusive of Aves), p. 279–297. In Tanke, D. H. and Carpenter, K. (eds.), Mesozoic Vertebrate Life. Indiana University Press, Bloomington.Google Scholar
Ryan, M. J. and Evans, D. C. 2005. Ornithischian Dinosaurs, p. 312–348. In Currie, P. J. and Koppelhus, E. B. (eds.), Dinosaur Provincial Park: A spectacular ancient ecosystem revealed. Indiana University Press, Bloomington.Google Scholar
Sampson, S. D., Ryan, M. J., and Tanke, D. H. 1997. Craniofacial ontogeny in centrosaurine dinosaurs (Ornithischia: Ceratopsidae): taxonomic and behavioral implications. Zooogical Journal of the Linnean Society, (121):293–337.Google Scholar
Sankey, J. T., Brinkman, D. B., Fox, R. C., and Eberth, D. A. 2005. Patterns of Distribution of Mammals in the Dinosaur Park Formation and the Paleobiological Significance, p. 437–449. In Currie, P. J. and Koppelhus, E. B. (eds.), Dinosaur Provincial Park: a spectacular ancient ecosystem revealed. Indiana University Press, Bloomington.Google Scholar
Seeley, H. G. 1888. On the classification of the fossil animals commonly named Dinosauria. Proceedings of the Royal Society of London, 43:165–171.Google Scholar
Sternberg, C. M. 1940. Ceratopsidae from Alberta. Journal of Paleontology, 14(5):468–480.Google Scholar
Swofford, D. L. 2002. Paup∗. Phylogenetic Analysis Using Parsimony (∗and other methods). Sinauer Associates, Sunderland, Massachusetts.Google Scholar
Ukrainsky, A. S. 2007. A New Replacement Name for Diceratops Lull, 1905 (Reptilia: Ornithischia: Ceratopsidae). Zoosystematica Rossica, 16(2):292.CrossRefGoogle Scholar
Weishampel, D. B., Barrett, P. M., Coria, R. A., Le Loeuff, J., Xu, X., Zhao, X., Sahni, A., Gomani, E., and Noto, C. R. 2004. Dinosaur Distribution, p. 517–606. In Weishampel, D. B., Dodson, P., and Osmolska, H. (eds.), The Dinosauria. University of California Press, Berkeley.CrossRefGoogle Scholar
Wiman, C. 1930. Uber Ceratopsia aus der oberen Kreide in New Mexico. Nova Acta Regiae Societatis Scientarum Upsaliensis, Series 4, 7:1–19.Google Scholar
Wu, X.-C. 2005. Crocodylians, p. 277–290. In Currie, P. J. and Koppelhus, E. B. (eds.), Dinosaur Provincial Park: a spectacular ancient ecosystem revealed. Indiana University Press, Bloomington.Google Scholar
Wu, X.-C., Brinkman, D. B., Eberth, D. A., and Braman, D. R. 2007. A new ceratopsid dinosaur from the uppermost Horseshoe Canyon Formation (upper Maastrichtian), Alberta, Canada. Canadian Journal of Earth Sciences, 44:1243–1265.CrossRefGoogle Scholar
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