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Journal of Vertebrate Paleontology Volume 26, 2006 - Issue 2
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PAPERS

A new turtle from the Arundel Clay facies (Potomac Formation, Early Cretaceous) of Maryland, U.S.A.

Thomas R. Lipka Principal Investigator, Arundel Project & Geobiological Research, 501 S. Frizzellburg Rd., Westminster, Maryland, 21158, U.S.A. E-mail: [email protected]
,
François Therrien Royal Tyrrell Museum of Palaeontology, Box 7500, Drumheller, Alberta, T0J 0Y0, Canada E-mail: [email protected]
,
David B. Weishampel Johns Hopkins University, School of Medicine, Center for Functional Anatomy and Evolution, 1830 E Monument Street, Baltimore, Maryland, 21205, U.S.A. E-mail: [email protected]
,
Heather A. Jamniczky University of Calgary, Department of Biological Sciences, 2500 University Drive NW, Calgary, Alberta, T2N 1N4, Canada E-mail: [email protected]
,
Walter G. Joyce Peabody Museum of Natural History, Yale University, PO Box 208118, New Haven, Connecticut, 06520-8118, U.S.A. E-mail: [email protected]
,
Matthew W. Colbert University of Texas at Austin, High Resolution X-Ray Computed Tomography Facility, Jackson School of Geosciences, 1 University Station, C-1110, Austin, Texas, 78712-0254, U.S.A. E-mail: [email protected]
&
Donald B. Brinkman Royal Tyrrell Museum of Palaeontology, Box 7500, Drumheller, Alberta, T0J 0Y0, Canada E-mail: [email protected]
 show all
Pages 300-307 | Received 09 Jul 2005, Accepted 02 Oct 2005, Published online: 02 Aug 2010
 
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ABSTRACT

A new paracryptodiran turtle, Arundelemys dardeni, gen. et sp. nov., is described on the basis of an isolated, nearly complete skull from the Early Cretaceous Arundel Clay facies of Maryland, USA. The basicranial region exhibits the paracryptodiran condition of a single foramen for the canalis caroticus internus located midway along the basisphenoid. As revealed by CT scans, the basicranial region of Arundelemys is unusual in that the right and left canales carotici interni merge just before reaching the sella turcica and the canalis caroticus lateralis is very small or absent. A phylogenetic analysis places Arundelemys dardeni as the basal-most member of the Paracryptodira. Within the Paracryptodira, Arundelemys dardeni is most similar to Compsemys victa in general proportions.

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