A partial ornithomimid braincase from Ukhaa Tolgod (Upper Cretaceous, Mongolia). American Museum novitates ; no. 3247

dc.contributor.authorMakovicky, Peter J.en_US
dc.contributor.authorNorell, Mark.en_US
dc.contributor.authorMongolian-American Museum Paleontological Project.en_US
dc.contributor.authorMongolyn Shinzhlėkh Ukhaany Akademi.en_US
dc.date.accessioned2005-10-06T16:54:30Z
dc.date.available2005-10-06T16:54:30Z
dc.date.issued1998en_US
dc.description16 p. : ill. ; 26 cm.en_US
dc.descriptionIncludes bibliographical references (p. 15-16).en_US
dc.description.abstract"Among the dinosaurian remains recently discovered by the Mongolian Academy of Sciences-American Museum of Natural History expeditions at the Ukhaa Tolgod locality (Southeastern Gobi Desert, Mongolia) are a partial braincase and cervical vertebrae of an ornithomimid dinosaur (IGM 100/987). This specimen represents the first record of an ornithomimid from this rich locality, as well as the first discovery of such an animal in Djadokhta-like beds. Although broken and slightly distorted, the preserved portion of the braincase reveals new information on the anatomy of ornithomimids. The middle ear region is enlarged and is connected to three expansive tympanic pneumatic systems as in other advanced theropods. The hypoglossal nerve (cranial nerve XII) is divided into three branches, a feature otherwise known among nonavialan coelurosaurs only in Troodon formosus. Several autapomorphies of the Ornithomimidae are preserved in IGM 100/987, including expansive pneumatization of the basioccipital-exoccipital region dorsal to the basal tubera and a large depression of the posterior face of the quadrate shaft. IGM 100/987 displays subtle differences from North American ornithomimid taxa and Gallimimus bullatus, but a more definite taxonomic assessment must await a thorough revision of ornithomimid phylogeny"--P. [1].en_US
dc.format.extent6608703 bytes
dc.format.mimetypeapplication/pdf
dc.identifier.urihttp://hdl.handle.net/2246/3234
dc.languageengen_US
dc.language.isoen_US
dc.publisherNew York, NY : American Museum of Natural Historyen_US
dc.relation.ispartofseriesAmerican Museum novitates ; no. 3247en_US
dc.subject.lccQL1 .A436 no.3247, 1998en_US
dc.subject.lcshOrnithomimidae -- Mongolia -- Ukhaa Tolgod.en_US
dc.subject.lcshDinosaurs -- Mongolia -- Ukhaa Tolgod.en_US
dc.subject.lcshReptiles, Fossil -- Mongolia -- Ukhaa Tolgod.en_US
dc.subject.lcshSkull.en_US
dc.subject.lcshPaleontology -- Cretaceous -- Mongolia -- Ukhaa Tolgod.en_US
dc.subject.lcshPaleontology -- Mongolia -- Ukhaa Tolgod.en_US
dc.titleA partial ornithomimid braincase from Ukhaa Tolgod (Upper Cretaceous, Mongolia). American Museum novitates ; no. 3247en_US
dc.typetexten_US
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