期刊
ACTA PALAEONTOLOGICA POLONICA
卷 57, 期 2, 页码 285-298出版社
INST PALEOBIOLOGII PAN
DOI: 10.4202/app.2011.0031
关键词
Testudines; Eucryptodira; freshwater turtle; Barremian; Cretaceous; Las Hoyas; Spain
类别
资金
- FPU subprogramme of the Ministerio de Ciencia e Innovacion [AP2007-00873]
- Willi Hennig Society
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 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.
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