Cranial anatomy of Citipati osmolskae (Theropoda, Oviraptorosauria), and a reinterpretation of the holotype of Oviraptor philoceratops. American Museum novitates ; no. 3364

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dc.contributor.authorClark, James Matthew, 1956-en_US
dc.contributor.authorNorell, Mark.en_US
dc.contributor.authorRowe, Timothy, 1953-en_US
dc.contributor.authorMongolian-American Museum Paleontological Project.en_US
dc.contributor.authorMongolyn ShinzhlÄ—kh Ukhaany Akademi.en_US
dc.contributor.authorCentral Asiatic Expeditions (1921-1930)en_US
dc.date.accessioned2005-10-06T16:40:38Z
dc.date.available2005-10-06T16:40:38Z
dc.date.issued2002en_US
dc.description24 p. : ill. ; 26 cm.en_US
dc.descriptionIncludes bibliographical references (p. 21-24).en_US
dc.description.abstractWe describe the skull of the holotype of Citipati osmolskae, one of the best preserved oviraptorid skulls known. The skull preserves stapes and epipterygoids, and the mandible preserves a slender coronoid bone, none of which has been reported before in oviraptorids. The braincase is similar to that of other basal coelurosaurs but possesses extensive recesses presumably occupied by pneumatic diverticulae; the circumnarial region is highly pneumatized, and a large recess continues posteriorly from the narial region to invade the frontals and parietals dorsal to the braincase. Circum-otic pneumatic recesses include two dorsal recesses above the otic recess, a posterior recess on the anterior surface of the paroccipital process, and extensive cavities in the basisphenoid beneath the braincase. The more dorsal of the two dorsal tympanic recesses is very deep, and CT scans suggest that it connected medially across the midline dorsal to the otic region and anteriorly with the frontoparietal space. The otic recess is unusually shallow. Comparison of the new skull with the poorly preserved skull of the holotype of Oviraptor philoceratops demonstrates that the braincase and palate of the latter are similar to those of other oviraptorids. Its rostrum and dentary are more elongate than in other oviraptorids, however, a more plesiomorphic condition suggesting it may be the most basal oviraptorid. A well-preserved skeleton previously referred to O. philoceratops, IGM 100/42, does not belong to this genus or species, and its narial region is very similar to that of Citipati osmolskae.en_US
dc.format.extent1181081 bytes
dc.format.mimetypeapplication/pdf
dc.identifier.urihttp://hdl.handle.net/2246/2853
dc.languageengen_US
dc.language.isoen_US
dc.publisherNew York, NY : American Museum of Natural Historyen_US
dc.relation.ispartofseriesAmerican Museum novitates ; no. 3364en_US
dc.subject.lccQL1 .A436 no.3364, 2002en_US
dc.subject.lcshCitipati osmolskae.en_US
dc.subject.lcshOviraptor philoceratops.en_US
dc.subject.lcshSkull.en_US
dc.subject.lcshDinosaurs -- Mongolia.en_US
dc.subject.lcshReptiles, Fossil -- Mongolia.en_US
dc.subject.lcshPaleontology -- Cretaceous -- Mongolia.en_US
dc.subject.lcshPaleontology -- Mongolia.en_US
dc.titleCranial anatomy of Citipati osmolskae (Theropoda, Oviraptorosauria), and a reinterpretation of the holotype of Oviraptor philoceratops. American Museum novitates ; no. 3364en_US
dc.typetexten_US

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