Anatomy and variability of "Cuvierichelys parisiensis", a geoemydid turtle that crosses the Eocene-Oligocene boundary in Belgium


Autoria(s): Pérez-García, Adán; UNED; Smith, R.; Directorate Earth & History of Life, Royal Belgian Institute of Natural Sciences, rue Vautier 29, B−1000 Brussels, Belgium.; Smith, T.; Directorate Earth & History of Life, Royal Belgian Institute of Natural Sciences, rue Vautier 29, B−1000 Brussels, Belgium.
Data(s)

20/10/2016

Resumo

Abundant material of turtles from the early Oligocene site of Boutersem-TGV (Boutersem, Belgium), is presented here. No information on the turtles found there was so far available. All the turtle specimens presented here are attributable to a single freshwater taxon that is identified as a member of Geoemydidae, Cuvierichelys. It is the first representative of the ‘Palaeochelys s. l.–Mauremys’ group recognized in the Belgian Paleogene record. This material, which allows to know all the elements of both the carapace and the plastron of the taxon, cannot be attributed to the only species of the genus Cuvierichelys so far identified in the Oligocene, the Spanish form Cuvierichelys iberica. The taxon from Boutersem is recognized as Cuvierichelys parisiensis. Thus, both the paleobiogeographic and the biostratigraphic distributions of Cuvierichelys parisiensis are extended, its presence being confirmed for the first time outside the French Eocene record. The validity of some European forms is refuted, and several characters previously proposed as different between Cuvierichelys iberica and Cuvierichelys parisiensis are recognized as subjected to intraspecific variability.

Abundante material de tortugas proveniente de una misma localidad, el yacimiento del Oligoceno inferior de Boutersem-TGV (Boutersem, Bélgica), es aquí presentado. Hasta ahora no existía ninguna información sobre las tortugas allí halladas. Todo el material de tortugas proveniente de ese yacimiento y presentado aquí es atribuible a un único taxón, correspondiente a una forma acuática. Se trata de un miembro de Geoemydidae, Cuvierichelys. Este hallazgo supone la primera identificación de un representante del grupo ‘Palaeochelys s. l.–Mauremys’ en el registro del Paleógeno Belga. Sin embargo, este material, que permite identificar todos los elementos tanto del espaldar como del plastrón, no puede ser atribuido a la única especie del género Cuvierichelys hasta ahora identificada en el Oligoceno, la forma española Cuvierichelys iberica. El taxón de Boutersem es reconocido como Cuvierichelys parisiensis. Su identificación fuera del registro Eoceno francés permite ampliar tanto la distribución paleobiogeográfica como bioestratigráfica de esta especie. La validez de varias formas europeas es refutada y varios caracteres previamente reconocidos cono diferentes entre Cuvierichelys iberica y Cuvierichelys parisiensis son justificados como sometidos a variabilidad intraespecífica.

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http://revistas.ucm.es/index.php/JIGE/article/view/51368

10.5209/rev_JIGE.2016.v42.n2.51368

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Ediciones Complutense

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http://revistas.ucm.es/index.php/JIGE/article/view/51368/49371

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Fonte

Journal of Iberian Geology; Vol 42, No 2 (2016); 161-170

Journal of Iberian Geology; Vol 42, No 2 (2016); 161-170

Palavras-Chave #Paleontology; Vertebrate Paleontology; Fossil turtles #Freshwater turtle; Cuvierichelys; Paleogene; Western Europe #Tortuga acuática; Cuvierichelys; Paleógeno; Europa Occidental
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