Dyrosaurid ‪(‬Crocodyliformes, Mesoeucrocodylia‪)‬ fossils from the Upper Cretaceous and Paleogene of Mali : implications for phylogeny and survivorship across the K-T boundary. American Museum novitates, no. 3631.

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dc.contributor.author Hill, Robert V.
dc.contributor.author McCartney, Jacob A.
dc.contributor.author Roberts, Eric M.
dc.contributor.author Bouaré, Mohamed L.
dc.contributor.author Sissoko, Famory.
dc.contributor.author O'Leary, Maureen A. (Maureen Ann)
dc.date.accessioned 2009-01-16T14:18:00Z
dc.date.available 2009-01-16T14:18:00Z
dc.date.issued 2008
dc.identifier.issn 0003-0082
dc.identifier.uri http://hdl.handle.net/2246/5940
dc.description 19 p. : ill., map ; 26 cm. Includes bibliographical references (p. 15-17). en
dc.description.abstract We describe new dyrosaurid fossils from three localities in Mali, representing strata of Maastrichtian, Paleocene, and Eocene ages. The fossils significantly extend the temporal and geographic ranges of several known dyrosaurid taxa. Rhabdognathus keiniensis and Chenanisuchus lateroculi are identified for the first time from Maastrichtian sediments. Additional material is referred to Phosphatosaurus gavialoides and, tentatively, the genus Sokotosuchus. These discoveries represent the first occurrence of Chenanisuchus and possibly of Sokotosuchus from Mali. Previously unknown morphological character states are incorporated into existing data matrices, reducing the amount of missing data. Phylogenetic analyses largely corroborate prior hypotheses of dyrosaurid relationships, but indicate a need for new characters to resolve the relationships of certain genera and species. The occurrence of both basal ‪(‬e.g., Chenanisuchus lateroculi‪)‬ and highly nested ‪(‬e.g., Rhabdognathus keiniensis‪)‬ members of Dyrosauridae on both sides of the K/T boundary indicates that dyrosaurid diversification was well underway by the latest Cretaceous, and that most, if not all dyrosaurid species survived the extinction event. The geology of the Mali’s Tilemsi Valley is clarified; some rocks previously assigned to the Iullemmeden Basin actually represent extensions of other basins: the Taoudeni Basin and Gao Trench. en
dc.format.extent 4110369 bytes
dc.format.mimetype application/pdf
dc.language.iso en_US en
dc.publisher New York, NY : American Museum of Natural History. en
dc.relation.ispartofseries American Museum novitates, no. 3631. en
dc.subject Dyrosauridae. en
dc.subject Mali. en
dc.subject Tilemsi Valley. en
dc.title Dyrosaurid ‪(‬Crocodyliformes, Mesoeucrocodylia‪)‬ fossils from the Upper Cretaceous and Paleogene of Mali : implications for phylogeny and survivorship across the K-T boundary. American Museum novitates, no. 3631. en
dc.title.alternative Dyrosaurid K/T survivorship. en

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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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