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New materials of Estesia mongoliensis (Squamata, Anguimorpha) and the evolution of venom grooves in lizards. (American Museum novitates, no. 3767)

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dc.contributor.author Yi, Hong-Yu.
dc.contributor.author Norell, Mark.
dc.contributor.author Mongolian-American Museum Paleontological Project.
dc.contributor.author Mongolyn Shinzhlėkh Ukhaany Akademi.
dc.date.accessioned 2013-01-29T16:39:14Z
dc.date.available 2013-01-29T16:39:14Z
dc.date.issued 2013-01-25
dc.identifier.uri http://hdl.handle.net/2246/6415
dc.description 31 p. : ill. (some col.) ; 26 cm. "This paper is based on significant field expeditions in the Gobi Desert carried out by joint expeitions of the Mongolian Academy of Sciences and the American Museum of Natural History"--Acknowledgments. en_US
dc.description.abstract New specimens of the fossil lizard Estesia mongoliensis are described from the Upper Cretaceous of Mongolia. Phylogenetic analysis of 86 anguimorph taxa coded with 435 morphological characters and four genes confirms the placement of Estesia mongoliensis in a monophyletic Monstersauria. Extant monstersaurs, the genus Heloderma, are the only extant lizards bearing venom-transmitting teeth with a deep venom grove in the rostral carina. Compared to the crown group, stem monstersaurs are morphologically more variable in venom-delivery apparatus. This study has found that Estesia mongoliensis has two shallow grooves in the rostral and caudal carinae of its dentary teeth, demonstrating a primary venom-delivery apparatus. A summary of venom-delivering tooth specialization in the Anguimorpha is provided, and related morphological characters are optimized on the strict consensus tree resulting from the combined morphological and molecular analysis of anguimorph phylogeny. The phylogeny supports a single origination of venom grooves in the Monstersauria, and indicates that grooved teeth are currently the only reliable venom-delivery apparatus to be recognized in fossil lizards. en_US
dc.language.iso en_US en_US
dc.publisher American Museum of Natural History. en_US
dc.relation.ispartofseries American Museum novitates, no. 3767. en_US
dc.subject Estesia mongoliensis. en_US
dc.subject Helodermatidae, Fossil. en_US
dc.subject Lizards, Fossil. en_US
dc.subject Teeth, Fossil. en_US
dc.subject Venom. en_US
dc.subject Anguimorpha. en_US
dc.subject Poisonous animals. en_US
dc.subject Mongolia. en_US
dc.subject Monstersauria. en_US
dc.title New materials of Estesia mongoliensis (Squamata, Anguimorpha) and the evolution of venom grooves in lizards. (American Museum novitates, no. 3767) en_US
dc.title.alternative Estesia mongoliensis. 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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