none 10.1144/SP295.7 Geological Society of London Geological Society of London 1881 33027127 65091 2024072310091100249 10.1144 2024-07-23T18:29:08Z 2008-06-02T19:38:08Z 17 Geological Society, London, Special Publications SP 0305-8719 2041-4927 06 02 2008 01 2008 295 1 G. Cuny Corresponding author. The Natural History Museum of Denmark, Øster Voldgade 5–7, 1350 Copenhagen K, Denmark (e-mail: ) UMR 5125 of the CNRS and Université Lyon–1, 7 rue Dubois, 69622 Villeurbanne cedex, France V. Suteethorn Department of Mineral Resources, Rama VI Road, Bangkok 10400, Thailand S. Kamha Department of Biology, Mahasarakham University, Tambon Khamriang, Amphur Kantarawichai, Mahasarakham 44150, Thailand E. Buffetaut Centre National de la Recherche Scientifique, UMR 5125, 16 cour du Liégat, 75013 Paris, France Abstract Isolated teeth of five hybodont species are described from the Khok Kruat Formation (Aptian): Hybodus aequitridentatus nov. sp., Heteroptychodus steinmanni , Thaiodus ruchae, Khoratodus foreyi nov. gen. et nov. sp., and Acrorhizodus khoratensis . A new family, Thaiodontidae is also erected for Thaiodus and Khoratodus. Two species are recognized inside the genus Heteroptychodus, H. steinmanni and H. chuvalovi nov. comb. These sharks show a wide range of diet and many of them appear to be restricted to a freshwater environment and thus are probably endemic to the Khorat Plateau. However, Thaiodus and Heteroptychodus are also found in deltaic and/or marine environments outside Thailand, but are nevertheless restricted to the Asian continent. 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