Convergent evolution of a eusuchian-type secondary palate within Shartegosuchidae. (American Museum novitates, no. 3901)

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dc.contributor.authorDollman, Kathleen N.
dc.contributor.authorClark, James Matthew, 1956-
dc.contributor.authorNorell, Mark.
dc.contributor.authorXu, Xing, 1969-
dc.contributor.authorChoiniere, Jonah N.
dc.contributor.authorMongolian-American Museum Paleontological Project.
dc.contributor.authorMongolyn Shinzhlėkh Ukhaany Akademi.
dc.date.accessioned2018-06-19T15:13:18Z
dc.date.available2018-06-19T15:13:18Z
dc.date.issued2018-06-18
dc.description23 pages : illustrations (some color), color map ; 26 cm.en_US
dc.description.abstractShartegosuchids are a poorly known, early-branching group of Asian and North American crocodylomorphs. Shartegosuchids have been hypothesized to have eusuchian-type secondary palates, but a paucity of described material makes assessing this difficult. Our fieldwork in western Mongolia recovered cranial material of a new Shartegosuchus specimen from the Ulan Malgait Formation, which we CT-scanned and digitally reconstructed to investigate its palatal morphology. We then incorporated this new anatomical information into a revised phylogenetic dataset to assess its affinities. Our study confirms that Shartegosuchus has a posteriorly placed choana that is fully enclosed by the pterygoids, but differs from Eusuchia in possessing a secondary palatal fenestra and reduced palatine bones. Shartegosuchus, together with Adzhosuchus, Fruitachampsa, and Nominosuchus, forms the monophyletic group Shartegosuchidae. Shartegosuchidae is nested within a larger clade Shartegosuchoidea, and this clade is an earlier-diverging lineage than Eusuchia, showing that a eusuchian-type secondary palate evolved multiple times in crocodylomorphs, including very early in the group's evolutionary history. The co-occurrence of Nominosuchus in the Ulan Malgait Formation and the Shishigou Formation allows us to assign an early Oxfordian age to Shartegosuchus. The independent evolution of a eusuchian-type secondary palate in an oreinorostral group suggests that the link between platyrostry and a closed secondary palate has been overstated.en_US
dc.identifier.urihttp://digitallibrary.amnh.org/handle/2246/6896
dc.language.isoen_USen_US
dc.publisherAmerican Museum of Natural History.en_US
dc.relation.ispartofseriesAmerican Museum novitates;no.3901.
dc.relation.urihttps://doi.org/10.5531/sd.sp.31
dc.subjectShartegosuchus asperopalatum.en_US
dc.subjectPalate.en_US
dc.subjectNasal fossa.en_US
dc.subjectConvergence (Biology)en_US
dc.subjectShartegosuchidae.en_US
dc.subjectShartegosuchoidea.en_US
dc.subjectPhylogeny.en_US
dc.subjectCrocodylomorpha.en_US
dc.subjectCrocodilians.en_US
dc.subjectGovʹ-Altaĭ Aĭmag (Mongolia)en_US
dc.subjectMongolia.en_US
dc.titleConvergent evolution of a eusuchian-type secondary palate within Shartegosuchidae. (American Museum novitates, no. 3901)en_US
dc.title.alternativeConvergent evolution in Shartegosuchidae palate.en_US

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