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Kalasinemys, a new xinjiangchelyid turtle from the Late Jurassic of NE Thailand

Published online by Cambridge University Press:  07 January 2019

Haiyan Tong ,
Wilailuck Naksri ,
Eric Buffetaut ,
Suravech Suteethorn ,
Varavudh Suteethorn ,
Phornphen Chantasit  and
Julien Claude
Haiyan Tong*
Affiliation:
Palaeontological Research and Education Centre, Mahasarakham University, Kantarawichai, Maha Sarakham 44150, Thailand
Wilailuck Naksri
Affiliation:
Northeastern Research Institute of Petrified Wood and Mineral Resources, Nakhon Ratchasima Rajabhat University, Mueang, Nakhon Ratchasima 30000, Thailand
Eric Buffetaut
Affiliation:
Palaeontological Research and Education Centre, Mahasarakham University, Kantarawichai, Maha Sarakham 44150, Thailand CNRS (UMR 8538), Laboratoire de Géologie de l’Ecole Normale Supérieure, PSL Research University, 24 rue Lhomond, 75231 Paris Cedex 05, France
Suravech Suteethorn
Affiliation:
Palaeontological Research and Education Centre, Mahasarakham University, Kantarawichai, Maha Sarakham 44150, Thailand Department of Biology, Faculty of Science, Mahasarakham University, Kantarawichai, Maha Sarakham 44150, Thailand
Varavudh Suteethorn
Affiliation:
Palaeontological Research and Education Centre, Mahasarakham University, Kantarawichai, Maha Sarakham 44150, Thailand
Phornphen Chantasit
Affiliation:
Sirindhorn Museum, Department of Mineral Resources, Sahatsakhan, Kalasin 46140, Thailand
Julien Claude
Affiliation:
Institut des Sciences de l’Evolution de Montpellier, CNRS/UM2/IRD, 2 Place Eugène Bataillon, cc64, 34095 Montpellier Cedex 5, France
*
Email: [email protected]
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Abstract

A new xinjiangchelyid turtle, Kalasinemys prasarttongosothi n. gen. n. sp., is described on the basis of skull and shell material from the Upper Jurassic Phu Kradung Formation at Phu Noi locality, Kalasin Province, in NE Thailand. This second xinjiangchelyid turtle from Phu Noi is distinct from Phunoichelys thirakhupti by the smooth shell surface, the presence of a cervical notch, and vertebral 1 narrower than nuchal. The skull presents an arterial system characteristic of the Xinjiangchelyidae (basal Eucryptodira), and its outline is similar to that of Annemys spp. known from the Middle–Late Jurassic of China and Mongolia, but distinct from the latter mainly by the wider triturating surface, smaller foramen palatinum posterius and the shape of the prefrontal and frontal, as well as that of the basisphenoid and basioccipital. Based on the turtle assemblages, the correlation with mainland Asia further supports a Late Jurassic age for the lower part of the Phu Kradung Formation where Phu Noi site is located stratigraphically. Our study provides new insight on the evolution of the basal eucryptodiran turtles in Asia.

Keywords

TestudinesXinjiangchelyidaeKalasinemyssystematicPhu Kradung FormationLate JurassicThailand
Type
Original Article
Information
Geological Magazine , Volume 156 , Issue 10 , October 2019 , pp. 1645 - 1656
Copyright
© Cambridge University Press 2019 

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