Research Library | Digital Repository

Sokatra, a new side-necked turtle (late Cretaceous, Madagascar) and the diversification of the main groups of Pelomedusoides. (American Museum novitates, no. 3728)

Show simple item record

dc.contributor.author Gaffney, Eugene S.
dc.contributor.author Krause, David W.
dc.date.accessioned 2011-12-22T19:32:35Z
dc.date.available 2011-12-22T19:32:35Z
dc.date.issued 2011-12-22
dc.identifier.uri http://hdl.handle.net/2246/6147
dc.description 28 p. : ill. ; 26 cm. en_US
dc.description.abstract Sokatra antitra, n. gen. et sp., is a new side-necked turtle from the Maastrichtian (Upper Cretaceous) Maevarano Formation, Mahajanga Basin, northwestern Madagascar. Sokatra antitra is based on a series of incomplete skulls: a partial skull that lacks the premaxillae and some of the basicranium, a partial skull that has a complete ear region and partial basicranium, and other isolated specimens, including dentaries. Although this species exhibits some features of the North African and Brazilian Euraxemydidae, it does not belong to this family, but instead it is the sister taxon of the magnafamily Podocnemidera of Gaffney et al. (2006, 2011). Characters of Sokatra uniting it with the magnafamily Podocnemidera are: quadratebasisphenoid contact, ventral covering of processus interfenestralis of opisthotic, and at least half of prootic covered ventrally. The laterally open foramen jugulare posterius and the distinct accessory ridge on the maxilla are characteristic, but not unique, features shared with members of the Euraxemydidae. The presence of a small wall posterior to the columellae auris and medial to the incisura columellae auris and the formation of the foramen posterius canalis carotici interni by both the prootic and quadrate are unique to Sokatra. In a PAUP analysis using the character matrix from Gaffney et al. (2006), Sokatra resolves as: (Pelomedusidae, Araripemys (Sokatra (Euraxemydidae (Bothremydidae, Podocnemididae)))). The deep phylogenetic roots of Sokatra indicates the presence of its lineage on Madagascar prior to the beginning of the late Cretaceous. 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. 3728. en_US
dc.subject Sokatra antitra. en_US
dc.subject Sokatra. en_US
dc.subject Turtles, Fossil. en_US
dc.subject Madagascar. en_US
dc.subject Mahajanga (Madagascar : Province) en_US
dc.title Sokatra, a new side-necked turtle (late Cretaceous, Madagascar) and the diversification of the main groups of Pelomedusoides. (American Museum novitates, no. 3728) en_US


Files in this item

This item appears in the following Collection(s)

  • 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.

Show simple item record

Search Entire Repository

Advanced Search

Browse

My Account