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Geological Society, London, Special Publications; 2009; v. 315; p. 97-113;
DOI: 10.1144/SP315.8
© 2009 Geological Society of London

Articles

A new elasmobranch fauna from the Middle Jurassic of southern Thailand

Gilles Cuny1, Paladej Srisuk2, Suchada Khamha3, Varavudh Suteethorn4 & Haiyan Tong5

1 Natural History Museum of Denmark, University of Copenhagen, Øster Voldgade 5–7, 1350 Copenhagen K, Denmark
2 Srisuk's House Museum, 100/12 Moo 1, Tambon Khao Yoi, Changwat Phetchaburi 76140, Thailand
3 Palaeontological Research and Education Centre, Mahasarakham University, Tambon Khamriang, Amphoe Kantarawichai, Mahasarakham 44150, Thailand
4 Department of Mineral Resources, Rama VI Road, Bangkok 10400, Thailand
5 16 cour du Liégat, 75013 Paris, France

*Corresponding author (e-mail: gilles{at}snm.ku.dk)

We describe a new elasmobranch fauna from the lower part of the Khlong Min Formation in Thailand. The fauna includes Hybodus sp., Asteracanthus sp., Lonchidion reesunderwoodi sp. nov., Belemnobatis aominensis sp. nov., and possibly a second species of Belemnobatis. This fauna supports a Bathonian–Callovian age for the Khlong Min Formation, and suggests a close taxonomic relationship between the Middle Jurassic elasmobranch faunas of Europe and Thailand. The presence of a monolayered enameloid in Belemnobatis aominensis sp. nov. and other primitive batoids is interpreted as the retention of a primitive character for neoselachians, which would suggest a divergence time between the batoids and the rest of the neoselachian sharks as early as the Carboniferous–Permian boundary.