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

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dc.contributor.authorPol, Diego.en_US
dc.contributor.authorNorell, Mark.en_US
dc.contributor.authorMongolian-American Museum Paleontological Project.en_US
dc.contributor.authorMongolyn ShinzhlÄ—kh Ukhaany Akademi.en_US
dc.date.accessioned2005-10-06T16:37:46Z
dc.date.available2005-10-06T16:37:46Z
dc.date.issued2004en_US
dc.description31 p. : ill. ; 26 cm.en_US
dc.descriptionElectronic version available in portable document format (PDF).en_US
dc.descriptionIncludes bibliographical references (p. 18-20).en_US
dc.description.abstractWe 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).en_US
dc.format.extent938072 bytes
dc.format.mimetypeapplication/pdf
dc.identifier.urihttp://hdl.handle.net/2246/2768
dc.languageengen_US
dc.language.isoen_US
dc.publisherNew York, NY : American Museum of Natural Historyen_US
dc.relation.ispartofseriesAmerican Museum novitates ; no. 3458en_US
dc.subject.lccQL1 .A436 no.3458, 2004en_US
dc.subject.lcshZaraasuchus shepardi.en_US
dc.subject.lcshCrocodilians, Fossil -- Mongolia.en_US
dc.subject.lcshReptiles, Fossil -- Mongolia.en_US
dc.subject.lcshPaleontology -- Cretaceous -- Mongolia.en_US
dc.subject.lcshPaleontology -- Mongolia.en_US
dc.subject.lcshPaleontology -- Gobi Desert (Mongolia and China)en_US
dc.subject.lcshCrocodilians -- Phylogeny.en_US
dc.titleA new gobiosuchid crocodyliform taxon from the Cretaceous of Mongolia. American Museum novitates ; no. 3458en_US
dc.typetexten_US

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