The anatomy of Effigia okeeffeae (Archosauria, Suchia), theropod-like convergence, and the distribution of related taxa ; Bulletin of the American Museum of Natural History, no. 302

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dc.contributor.authorNesbitt, Sterling J.en_US
dc.date.accessioned2007-01-31T16:59:27Z
dc.date.available2007-01-31T16:59:27Z
dc.date.issued2007en_US
dc.description84 p. : ill. ; 26 cm.en_US
dc.descriptionIncludes bibliographical references (p. 74-78).en_US
dc.description.abstractEffigia okeeffeae is named based on a well-preserved nearly complete skeleton from the Upper Triassic (?Rhaetian) "siltstone member" at Ghost Ranch, northern New Mexico. The skull is described and compared to other suchian and basal archosaurs. The maxilla and premaxilla are edentulous, and a rhamphotheca was possibly present in life. Effigia conclusively indicates that the skull of Shuvosaurus and the postcrania of "Chatterjeea" belong to the same taxon. Furthermore, the close relationship between Shuvosaurus and Effigia indicates that both taxa are nested within the suchian clade and not within Ornithomimisauria. However, the similarity in features in the skull and postcrania of Effigia and ornithomimids suggests extreme convergence occurred between the two clades. A clade containing Arizonasaurus, Bromsgroveia, Poposaurus, Sillosuchus, Shuvosaurus, and Effigia is suggested based solely on shared derived character states. Additionally, a clade (Clade Y) containing Sillosuchus, Shuvosaurus, and Effigia is well supported by further derived character states. The distribution and temporal pattern of members of Group Y suggest that members of Group Y are present in the early Middle Triassic through the latest Triassic of North America, and one member of the clade, Sillosuchus, was present in South America.en_US
dc.format.extent12694489 bytes
dc.format.mimetypeapplication/pdf
dc.identifier.urihttp://hdl.handle.net/2246/5840
dc.languageengen_US
dc.language.isoen_US
dc.publisherNew York, NY : American Museum of Natural Historyen_US
dc.relation.ispartofseriesBulletin of the American Museum of Natural History, no. 302en_US
dc.subject.lccQH1 .A4 no.302 2007en_US
dc.subject.lcshEffigia okeeffeae.en_US
dc.subject.lcshReptiles, Fossil -- New Mexico -- Abiquiu Region.en_US
dc.subject.lcshPaleontology -- Triassic -- New Mexico -- Abiquiu Region.en_US
dc.subject.lcshPaleontology -- New Mexico -- Abiquiu Region.en_US
dc.subject.lcshReptiles, Fossil -- Phylogeny.en_US
dc.subject.lcshDinosaurs -- Phylogeny.en_US
dc.subject.lcshReptiles, Fossil -- America -- Geographical distribution.en_US
dc.subject.lcshReptiles -- Evolution.en_US
dc.subject.lcshReptiles -- Dispersal -- America.en_US
dc.subject.lcshPaleontology -- Chinle Formation.en_US
dc.titleThe anatomy of Effigia okeeffeae (Archosauria, Suchia), theropod-like convergence, and the distribution of related taxa ; Bulletin of the American Museum of Natural History, no. 302en_US
dc.typetexten_US

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