A new freshwater basal eucryptodiran turtle from the Early Cretaceous of Spain

作者：Perez Garcia Adan^*; de la Fuente Marcelo S; Ortega Francisco

来源：Acta Palaeontologica Polonica, 2012, 57(2): 285-298.

DOI：10.4202/app.2011.0031

• Testudines
• Eucryptodira
• freshwater turtle
• Barremian
• Cretaceous
• Las Hoyas
• Spain

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 Kind 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 %26quot;chelydroid%26quot; 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.

• 出版日期2012-6