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A new gobiosuchid crocodyliform taxon from the Cretaceous of Mongolia. American Museum novitates ; no. 3458

Show simple item record Pol, Diego. en_US Norell, Mark. en_US Mongolian-American Museum Paleontological Project. en_US Mongolyn Shinzhlėkh Ukhaany Akademi. en_US 2005-10-06T16:37:46Z 2005-10-06T16:37:46Z 2004 en_US
dc.description 31 p. : ill. ; 26 cm. en_US
dc.description Electronic version available in portable document format (PDF). en_US
dc.description Includes bibliographical references (p. 18-20). en_US
dc.description.abstract "We describe a new fossil crocodyliform, Zaraasuchus shepardi, found in the Cretaceous Red Beds of Zos Canyon (Gobi Desert, Mongolia). Z. shepardi shares numerous derived characters with Gobiosuchus kielanae, also known from the late Cretaceous of Mongolia (Bayn Dzak locality). However, it is distinguished from the latter by the presence of a moderately large infratemporal fenestra, anterior margin of infratemporal fenestra almost completely formed by the postorbital, retroarticular process with a well-developed ornamented posterolateral pointed process, and extremely well-developed keels on dorsal and lateral cervical osteoderms (the heights of which are approximately as long as the lateromedial extension of the dorsal osteoderms). A phylogenetic analysis indicated that these two taxa form a monophyletic group located basally among crocodyliforms. This clade is diagnosed by 14 synapomorphies (e.g., anterior and posterior palpebrals sutured to each other and to the frontal, excluding it from the orbital margin, external surface of ascending process of jugal exposed posterolaterally, dorsal surface of posterolateral process of squamosal ornamented with three longitudinal ridges, dorsal surface of osteoderms ornamented with anterolaterally and anteromedially directed ridges, cervical region surrounded by lateral and ventral osteoderms sutured to the dorsal elements, and closed supratemporal fenestra)"--P. [1]. en_US
dc.format.extent 938072 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. 3458 en_US
dc.subject.lcc QL1 .A436 no.3458, 2004 en_US
dc.subject.lcsh Zaraasuchus shepardi. en_US
dc.subject.lcsh Crocodilians, Fossil -- Mongolia. en_US
dc.subject.lcsh Reptiles, Fossil -- Mongolia. en_US
dc.subject.lcsh Paleontology -- Cretaceous -- Mongolia. en_US
dc.subject.lcsh Paleontology -- Mongolia. en_US
dc.subject.lcsh Paleontology -- Gobi Desert (Mongolia and China) en_US
dc.subject.lcsh Crocodilians -- Phylogeny. en_US
dc.title A new gobiosuchid crocodyliform taxon from the Cretaceous of Mongolia. American Museum novitates ; no. 3458 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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