Research and Collections

Publications by Perot Museum Scientists

Dr. Tykoski’s Recent Papers

Ronald S. Tykoski, Anthony R. Fiorillo, and Kentaro Chibab. New data and diagnosis for the Arctic ceratopsid dinosaur Pachyrhinosaurus perotorum. or read the abstract here

Tykoski, R.S., and Fiorillo, A.R.  2016.  An articulated cervical series of Alamosaurus sanjuanensis Gilmore, 1922 (Dinosauria: Sauropoda) from Texas: new perspective on the relationships of North America’s last giant sauropod.  Journal of Systematic Palaeontology 15(5):339-364,

Fiorillo A.R. and Tykoski, R.S. 2014. A Diminutive New Tyrannosaur from the Top of the World. PLoS ONE 9(3): e91287. doi:10.1371/journal.pone.0091287

Tykoski, R.S., and Fiorillo, A.R. 2013. Beauty or brains? The braincase of Pachyrhinosaurus perotorumand its utility for species-level distinction in the centrosaurine ceratopsid Pachyrhinosaurus. Earth and Environmental Science Transactions of the Royal Society of Edinburgh, 103(3-4):487-499. doi:

Fiorillo, A.R., and Tykoski, R.S. 2013. An immature Pachyrhinosaurus perotorum(Dinosauria: Ceratopsidae) nasal reveals unexpected complexity of craniofacial ontogeny and integument in Pachyrhinosaurus. PLoS ONE 8(6): e65802. doi:10.1371/journal.pone.0065802

Fiorillo, A.R., and Tykoski, R.S. 2012. A new Maastrichtian species of the centrosaurine ceratopsid Pachyrhinosaurus from the North Slope of Alaska. Acta Palaeontologica Polonica 57(3): 561-573, doi:

Tykoski, R.S., and Fiorillo, A.R. 2010. An enantiornithine bird from the lower Middle Cenomanian of Texas. Journal of Vertebrate Paleontology 30:288-292.

Fiorillo, A.R., Tykoski, R.S., Currie, P.J., McCarthy, P.J., and Flaig, P. 2009. Description of Two Partial Troodon Braincases from the Prince Creek Formation (Upper Cretaceous), North Slope Alaska. Journal of Vertebrate Paleontology 29:178-187.

Allain, R., Tykoski, R., Aquesbi, N., Jalil, N, Monbaron, M., Russell, D., and Taquet, P. 2007. An abelisauroid (Dinosauria: Theropoda) from the Early Jurassic of the High Atlas Mountains, Morocco, and the radiation of ceratosaurs. Journal of Vertebrate Paleontology 27:610-624.

Tykoski, R. 2007. Small theropods, big ideas; pp. 86 in T. Holtz, Jr., Dinosaurs: the most complete, up-to-date encyclopedia for dinosaur lovers of all ages. Random House, New York, New York.

Tykoski, R.S. 2005. Vertebrate paleontology in the Arizona Jurassic; pp. 72-93 in R. D. McCord (ed.), Vertebrate Paleontology of Arizona. Mesa Southwest Museum Bulletin Number 11. Mesa, Arizona.

Tykoski, R.S., and Rowe, T. 2004. Ceratosauria; pp. 47-70 in D. B. Weishampel, P. Dodson, and H. Osmolska (eds.), The Dinosauria, Second Edition. University of California Press, Berkeley, California.

Tykoski, R.S., Forster, C.A., Rowe, T., Sampson, S.D., and Munyikwa, D. 2002. A furcula in the coelophysid theropod Syntarsus. Journal of Vertebrate Paleontology 22:728-733.

Tykoski, R.S., Rowe,T.B., Ketcham, R.A., and Colbert, M.W. 2002. Calsoyasuchusvalliceps, a new crocodyliform from the Early Jurassic Kayenta Formation of Arizona. Journal of Vertebrate Paleontology 22:593-611.

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