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A new primitive eucryptodiran turtle from the Upper Jurassic Phu Kradung Formation of the Khorat Plateau, NE Thailand

Published online by Cambridge University Press:  19 June 2014

HAIYAN TONG ,
WILAILUCK NAKSRI ,
ERIC BUFFETAUT ,
VARAVUDH SUTEETHORN ,
SURAVECH SUTEETHORN ,
UTHUMPORN DEESRI ,
SAITONG SILA ,
PHORNPHEN CHANTHASIT  and
JULIEN CLAUDE
HAIYAN TONG*
Affiliation:
Palaeontological Research and Education Centre, Mahasarakham University, Kantarawichai, Mahasarakham 44150, Thailand
WILAILUCK NAKSRI
Affiliation:
Northeastern Institute of Petrified Wood and Mineral Resources, Nakhon Ratchasima Rajabhat University, Mueang, Nakhon Ratchasima 30000, Thailand
ERIC BUFFETAUT
Affiliation:
CNRS (UMR 8538), Laboratoire de Géologie de l’Ecole Normale Supérieure, 24 rue Lhomond, 75231 Paris Cedex 05, France
VARAVUDH SUTEETHORN
Affiliation:
Palaeontological Research and Education Centre, Mahasarakham University, Kantarawichai, Mahasarakham 44150, Thailand
SURAVECH SUTEETHORN
Affiliation:
Palaeontological Research and Education Centre, Mahasarakham University, Kantarawichai, Mahasarakham 44150, Thailand
UTHUMPORN DEESRI
Affiliation:
Biology Department, Faculty of Science, Mahasarakham University, Khamrieng, Kantarawichai District, Mahasarakham, 44150Thailand
SAITONG SILA
Affiliation:
Palaeontological Research and Education Centre, Mahasarakham University, Kantarawichai, Mahasarakham 44150, Thailand
PHORNPHEN CHANTHASIT
Affiliation:
Sirindhorn Museum, Department of Mineral Resources, Sahatsakhan, Kalasin, 46140Thailand
JULIEN CLAUDE
Affiliation:
Institut des Sciences de l’Evolution de Montpellier, UMR 5554 CNRS/UM2/IRD, 2, Place Eugène Bataillon, cc64, 34095 Montpellier Cedex 5, France
*
†Author for correspondence: [email protected]
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Abstract

A new genus and new species of primitive eucryptodiran turtle, Phunoichelys thirakhupti gen. et sp. nov., is described on the basis of shell remains from the lower part of the Phu Kradung Formation, at Phu Noi locality, Kalasin Province, NE Thailand. It is assigned to Xinjiangchelyidae on the basis of the marginals covering the lateral end of the costals and the anal scutes invading the hypoplastra. The new taxon is further characterized by a low and rounded carapace without a cervical notch; the whole carapace and plastron covered with a clear ornamentation consisting of tiny irregular vermiculated furrows; a complete neural series that reaches the suprapygal; a very wide and short cervical scute; relatively wide vertebral scutes; and a long first thoracic rib that extends along the full width of the first costal. The sutured plastron/carapace connection and the marginals covering the lateral end of the second to seventh costals suggest that the turtles from Phu Noi may be related to some primitive xinjiangchelyids from the Sichuan Basin. The discovery of a xinjiangchelyid turtle in the lower part of the Phu Kradung Formation supports a Late Jurassic age for that part of the formation.

Keywords

TestudinesEucryptodiraXinjiangchelyidaePhunoichelys thirakhuptiLate JurassicPhu Kradung FormationNE Thailand
Type
Original Articles
Information
Geological Magazine , Volume 152 , Issue 1 , January 2015 , pp. 166 - 175
Copyright
Copyright © Cambridge University Press 2014 

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