A NEW TURTLE FROM THE ARUNDEL CLAY FACIES (POTOMAC FORMATION, EARLY CRETACEOUS) OF MARYLAND, U.S.A.

THOMAS R. LIPKA; FRANÇOIS THERRIEN; DAVID B. WEISHAMPEL; HEATHER A. JAMNICZKY; WALTER G. JOYCE; MATTHEW W. COLBERT; DONALD B. BRINKMAN

doi:10.1671/0272-4634(2006)26[300:ANTFTA]2.0.CO;2

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1 June 2006 A NEW TURTLE FROM THE ARUNDEL CLAY FACIES (POTOMAC FORMATION, EARLY CRETACEOUS) OF MARYLAND, U.S.A.

THOMAS R. LIPKA, FRANÇOIS THERRIEN, DAVID B. WEISHAMPEL, HEATHER A. JAMNICZKY, WALTER G. JOYCE, MATTHEW W. COLBERT, DONALD B. BRINKMAN

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THOMAS R. LIPKA,¹ FRANÇOIS THERRIEN,² DAVID B. WEISHAMPEL,³ HEATHER A. JAMNICZKY,⁴ WALTER G. JOYCE,⁵ MATTHEW W. COLBERT,⁶ DONALD B. BRINKMAN⁷

¹Principal Investigator, Arundel Project & Geobiological Research, 501 S. Frizzellburg Rd., Westminster, Maryland. 21158, U.S.A., thomasrlipka@adelphia.net
²Royal Tyrrell Museum of Palaeontology, Box 7500, Drumheller, Alberta, T0J 0Y0, Canada, francois.therrien@gov.ab.ca
³Johns Hopkins University, School of Medicine, Center for Functional Anatomy and Evolution, 1830 E Monument Street, Baltimore, Maryland 21205, U.S.A. dweisham@jhmi.edu
⁴University of Calgary, Department of Biological Sciences, 2500 University Drive NW, Calgary, Alberta, T2N 1N4, Canada, hajamnic@ucalgary.ca
⁵Peabody Museum of Natural History, Yale University, PO Box 208118, New Haven, Connecticut, 06520-8118, U.S.A, walter.joyce@yale.edu
⁶University 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., colbert@mail.utexas.edu
⁷Royal Tyrrell Museum of Palaeontology, Box 7500, Drumheller, Alberta, T0J 0Y0, Canada, don.brinkman@gov.ab.ca

J. of Vertebrate Paleontology, 26(2):300-307 (2006). https://doi.org/10.1671/0272-4634(2006)26[300:ANTFTA]2.0.CO;2

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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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THOMAS R. LIPKA, FRANÇOIS THERRIEN, DAVID B. WEISHAMPEL, HEATHER A. JAMNICZKY, WALTER G. JOYCE, MATTHEW W. COLBERT, and DONALD B. BRINKMAN "A NEW TURTLE FROM THE ARUNDEL CLAY FACIES (POTOMAC FORMATION, EARLY CRETACEOUS) OF MARYLAND, U.S.A.," Journal of Vertebrate Paleontology 26(2), 300-307, (1 June 2006). https://doi.org/10.1671/0272-4634(2006)26[300:ANTFTA]2.0.CO;2

Accepted: 2 October 2005; Published: 1 June 2006

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June 2006

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THOMAS R. LIPKA, FRANÇOIS THERRIEN, DAVID B. WEISHAMPEL, HEATHER A. JAMNICZKY, WALTER G. JOYCE, MATTHEW W. COLBERT, DONALD B. BRINKMAN "A NEW TURTLE FROM THE ARUNDEL CLAY FACIES (POTOMAC FORMATION, EARLY CRETACEOUS) OF MARYLAND, U.S.A.," Journal of Vertebrate Paleontology, 26(2), 300-307, (1 June 2006)

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