The braincases of two glyptosaurines (Anguidae, Squamata) and anguid phylogeny ; American Museum novitates, no. 3613

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dc.contributor.authorConrad, Jack L.en_US
dc.contributor.authorNorell, Mark.en_US
dc.date.accessioned2008-06-23T15:02:33Z
dc.date.available2008-06-23T15:02:33Z
dc.date.issued2008en_US
dc.description24 p. : ill. ; 26 cm.en_US
dc.descriptionIncludes bibliographical references (p. 20-23).en_US
dc.description.abstractGlyptosaurines are an extinct clade of anguids whose remains are common in many Holarctic Paleogene and Cretaceous deposits. Despite their extensive fossil record (comprised mainly of scutes) the braincase is poorly known. Here, we describe braincase morphology in two North American Eocene glyptosaurines, Melanosaurus maximus and Helodermoides tuberculatus. Although generally conservative in their braincase morphology compared with other anguids, these taxa and some other "higher" glyptosaurines possess a dorsally displaced parasphenoid rostrum. The anterior openings for the Vidian canals open almost directly ventral to the parasphenoid rostrum, and the internal carotids exit anteriorly almost directly dorsal to it. Our phylogenetic analysis recovers a monophyletic Glyptosaurinae nested within Anguidae as the sister taxon to a clade containing Gerrhonotinae and Anguinae. According to our analysis, "melanosaurins" are paraphyletic, Placosaurus is paraphyletic, and Anniella is the sister taxon to Anguis.en_US
dc.format.extent3640842 bytes
dc.format.mimetypeapplication/pdf
dc.identifier.urihttp://hdl.handle.net/2246/5917
dc.languageengen_US
dc.language.isoen_US
dc.publisherNew York, NY : American Museum of Natural Historyen_US
dc.relation.ispartofseriesAmerican Museum novitates, no. 3613en_US
dc.subject.lccQL1 .A436 no.3613 2008en_US
dc.subject.lcshMelanosaurus maximus.en_US
dc.subject.lcshHelodermoides tuberculatus.en_US
dc.subject.lcshAnguidae, Fossil -- North America.en_US
dc.subject.lcshReptiles, Fossil -- North America.en_US
dc.subject.lcshPaleontology -- Eocene -- North America.en_US
dc.subject.lcshPaleontology -- North America.en_US
dc.titleThe braincases of two glyptosaurines (Anguidae, Squamata) and anguid phylogeny ; American Museum novitates, no. 3613en_US
dc.typetexten_US

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