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11 May 2011 A New Freshwater Basal Eucryptodiran Turtle from the Early Cretaceous of Spain
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Abstract

A freshwater turtle from the lithographic limestone of Las Hoyas (Barremian of Cuenca, Spain) is described as a new genus and species of Eucryptodira, Hoyasemys jimenezi. The holotype consists of the skull, lower jaw, carapace, plastron, vertebral column, pectoral and pelvic girdle remains, and fore- and hindlimbs. Hoyasemys jimenezi gen. et sp. nov. is characterized by three pairs of blind oblique depressions on the ventral surface of the basisphenoid, and a character combination composed, among others, of the articulation between the fourth and fifth cervical vertebrae through a cotyle in the fourth and a condyle in the fifth, amphicoelous caudal centra, and most digits of manus and pes with three elongated phalanges. This study allows clarification of the systematic position of a species of uncertain affinity often identified as “chelydroid” in appearance. A phylogenetic analysis shows Hoyasemys jimenezi gen. et sp. nov. forms a monophyletic group with Judithemys sukhanovi, Dracochelys bicuspis, Sinemys lens, and Ordosemys leios, collectively the sister group of crown Cryptodira.

Adán Pérez-García, Marcelo S. de la Fuente, and Francisco Ortega "A New Freshwater Basal Eucryptodiran Turtle from the Early Cretaceous of Spain," Acta Palaeontologica Polonica 57(2), 285-298, (11 May 2011). https://doi.org/10.4202/app.2011.0031
Received: 25 March 2011; Accepted: 1 May 2011; Published: 11 May 2011
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