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A revision of Sinaspideretes wimani Young & Chow, 1953 (Testudines: Cryptodira: Trionychoidae) from the Jurassic of the Sichuan Basin, China

Published online by Cambridge University Press:  04 September 2013

HAIYAN TONG ,
LU LI  and
HUI OUYANG
HAIYAN TONG*
Affiliation:
Palaeontological Research and Education Centre, Mahasarakham University, Kantarawichai, Mahasarakham 44150, Thailand Key Laboratory of Vertebrate Evolution and Human Origin of Chinese Academy of Sciences, Institute of Vertebrate Palaeontology and Palaeoanthropology, Chinese Academy of Sciences, Beijing 100044, China
LU LI
Affiliation:
Key Laboratory of Vertebrate Evolution and Human Origin of Chinese Academy of Sciences, Institute of Vertebrate Palaeontology and Palaeoanthropology, Chinese Academy of Sciences, Beijing 100044, China
HUI OUYANG
Affiliation:
Chongqing Museum of Natural History, 74 Pipashanzhengjie, Yuzhong District, Chongqing 400013, China
*
†Author for correspondence: htong09@yahoo.fr
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Abstract

Sinaspideretes wimani Young & Chow, 1953 was based on a single shell from the Jurassic red beds of the Sichuan Basin. Originally referred to Trionychidae but later tentatively assigned to Carettochelyidae, it was long thought to be the oldest representative of those families. The re-examination of the carapace and further preparation of the plastron of the holotype of S. wimani revealed a number of important characters which clearly exclude this taxon from both Trionychidae and Carettochelyidae, but unite it with the primitive trionychoid Yehguia tatsuensis (Ye, 1963). S. wimani is therefore considered as the basalmost member of Trionychoidae. Our study adds to the evidence from the fossil record for the antiquity of Trionychoidae, thus is in agreement with the early split of Trionychia (Trionychidae and Carettochelyidae) among the crown Testudines suggested by the molecular phylogeny of turtles.

Keywords

TestudinesTrionychoidaeSinaspideretes wimaniJurassicSichuan BasinChina
Type
Original Articles
Information
Geological Magazine , Volume 151 , Issue 4 , July 2014 , pp. 600 - 610
Copyright
Copyright © Cambridge University Press 2013 

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