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

Show simple item record Makovicky, Peter J. en_US Norell, Mark. en_US Mongolian-American Museum Paleontological Project. en_US Mongolyn Shinzhlėkh Ukhaany Akademi. en_US 2005-10-06T16:54:30Z 2005-10-06T16:54:30Z 1998 en_US
dc.description 16 p. : ill. ; 26 cm. en_US
dc.description Includes 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.extent 6608703 bytes
dc.format.mimetype application/pdf
dc.language eng en_US
dc.language.iso en_US
dc.publisher New York, NY : American Museum of Natural History en_US
dc.relation.ispartofseries American Museum novitates ; no. 3247 en_US
dc.subject.lcc QL1 .A436 no.3247, 1998 en_US
dc.subject.lcsh Ornithomimidae -- Mongolia -- Ukhaa Tolgod. en_US
dc.subject.lcsh Dinosaurs -- Mongolia -- Ukhaa Tolgod. en_US
dc.subject.lcsh Reptiles, Fossil -- Mongolia -- Ukhaa Tolgod. en_US
dc.subject.lcsh Skull. en_US
dc.subject.lcsh Paleontology -- Cretaceous -- Mongolia -- Ukhaa Tolgod. en_US
dc.subject.lcsh Paleontology -- Mongolia -- Ukhaa Tolgod. en_US
dc.title A partial ornithomimid braincase from Ukhaa Tolgod (Upper Cretaceous, Mongolia). American Museum novitates ; no. 3247 en_US
dc.type text en_US

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  • American Museum Novitates
    Novitates (Latin for "new acquaintances"), published continuously and numbered consecutively since 1921, are short papers that contain descriptions of new forms and reports in zoology, paleontology, and geology. New numbers are published at irregular intervals.

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