69975 20190709135543.0 doi 10.4202/app.00340.2017 sideral 105156 ART-2017-105156 eng De la Fuente, M.S. Unusual shell anatomy and osteohistology in a new Late Cretaceous panchelid turtle from northwestern Patagonia, Argentina 2017 Access copy available to the general public Unrestricted Rionegrochelys caldieroi de la Fuente, Maniel, and Jannello gen. et sp. nov. is a Late Cretaceous turtle from Rio Negro Province, Argentina. The holotype and the referred specimens of this new species show an unusual shell morphology and microanatomy. The proportion between the carapace and plastron and the peculiar morphology of the shell such as the heart shaped carapace, a very deep nuchal notch, peripheral bones 2-11 with strongly gutter, the first vertebral scute twice as wide as long and subrectangular in shape, the posterior margin of vertebral scute 5 is three lobe shaped, and the unexpected osteohistology characterized by a massive structure, with higher compactness (80.6%) than other chelids, suggests beyond doubt that this turtle may be considered a new taxon. A semi-aquatic habitat with tendency towards terrestrial environments is inferred for Rionegrochelys caldieroi similar to that of the extant pelomedusid Pelomedusa subrufa among the extant pleurodires. Rionegrochelys caldieroi is recovered as a stem chelid. This new species seems to be closely related to Bonapartemys bajobarrealis and the Glade formed by Lomalatachelys neuquina plus Mendozachelys wichmanni. info:eu-repo/grantAgreement/ES/MINECO/CGL2014-53548 info:eu-repo/semantics/openAccess by http://creativecommons.org/licenses/by/3.0/es/ 1.887 2017 PALEONTOLOGY 12 / 54 = 0.222 2017 Q1 T1 0.788 2017 Paleontology 2017 Q1 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Mantel, I. Jannello, J.M. Sterli, J. Garrido, A.C. Garcia, R.A. Salgado, L. (orcid)0000-0003-1732-9155 Canudo, J.I. Universidad de Zaragoza Bolatti, R. 2000 655 Universidad de Zaragoza Dpto. Ciencias de la Tierra Área Paleontología 62, 3 (2017), 585-601 Acta Palaeontol. Pol. ACTA PALAEONTOLOGICA POLONICA 0567-7920 1521849 http://zaguan.unizar.es/record/69975/files/texto_completo.pdf Versión publicada 96670 http://zaguan.unizar.es/record/69975/files/texto_completo.jpg?subformat=icon icon Versión publicada oai:zaguan.unizar.es:69975 articulos driver 2019-07-09-12:08:17 ARTICLE