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PalZ

, Volume 90, Issue 3, pp 533–541 | Cite as

Revision of Isanodus paladeji (Elasmobranchii, Hybodontiformes) from the Lower Cretaceous of Thailand

  • Suchada Khamha
  • Gilles Cuny
  • Komsorn Lauprasert
Research Paper

Abstract

Microremains from the Lower Cretaceous Phu Phan Thong locality, Nong Bua Lam Phu Province, northeastern Thailand, yielded ten tooth morphotypes of the freshwater shark genus Isanodus, which allow the revision of this genus. Two new morphotypes assigned to anterolateral and posterolateral teeth possess shared characters with anterior and posterior teeth of Isanodus paladeji whereas its former anterolateral and posterolateral teeth appear to belong to a new species, Isanodus nongbualamphuensis sp. nov. The pattern of ornamentation in some teeth of I. paladeji and I. nongbualamphuensis is quite similar to that observed in the genus Heteroptychodus, suggesting these two genera are closely related.

Keywords

Isanodus Elasmobranchii Hybodontiformes Lower Cretaceous Thailand 

Kurzfassung

Mikro-Überreste aus der Unterkreide von Phu Phan Thong Ort, Nong Bua Lam Phu Province, Thailand, ergaben zehn Zahnmorphotypen der Süßwasser Hai-Gattung Isanodus, die eine Revision dieser Gattung erlauben. Zwei neue Morphotypen besitzen gemeinsame Merkmale mit vorderen und hinteren Zähnen von Isanodus paladeji und werden als anterolaterale oder posterolaterale Zähne betrachtet. Die Zähne, die früher als anterolaterale oder posterolaterale Zähne von I. paladeji identifiziert wurden, scheinen in der Tat zu einer neuen Art, Isanodus nongbualamphuensis sp. nov., zu gehören. Zwei Morphotypen können nicht zu einer dieser beiden Arten gehören und zeigen die Anwesenheit einer dritten Art. Das Ornamentations-Muster in einigen Zähnen von I. paladeji und I. nongbualamphuensis sp. nov. ist ziemlich ähnlich dem in der Gattung Heteroptychodus beobachteten, was eine eng Verwandtschaft dieser beiden Gattungen andeutet.

Schlüsselwörter

Isanodus Elasmobranchii Hybodontiformes Unterkreide Thailand 

Notes

Acknowledgments

The authors would like to thank Dr. Varavudh Suteethorn for his support and for granting us access to the PRC collection. We also thanks Nual-Anong Narkkong for her help with the SEM at Mahasarakham University, and Chalida Laojumpon for access to Kut Island’s collection. This work was supported by a CHE-PhD-THA scholarship, and GC’s work was funded by the Carlsberg Foundation and carried out under National Research Council of Thailand authorizations 126/51 and 102/54. We would like to thank all individuals who helped during this work, including Utumporn Deesri, Paladej Srisuk, Suravech Suteethorn, Atiwut Patanapitaksakul, Siripa Phusangthong, Saithong Sila, Kamollak Wonggo and Dr. Jolyon Dodgson. Special thanks are also due to Serge Legendre and Jürgen Pöllerspock for their help with the translation of the abstract in German. Finally, comments on the manuscript by Charlie Underwood and Jürgen Kriwet greatly enhanced its quality.

References

  1. Bonaparte, C.L.J.L. 1838. Selachorum tabula analytica. Nuovi Annali della Scienze Naturali, Bologna 2(1): 195–214.Google Scholar
  2. Cuny, G., V. Suteethorn, S. Kamha, E. Buffetaut, and M. Philippe. 2006. A new hybodont shark assemblage from the Lower Cretaceous of Thailand. Historical Biology 18: 21–31.CrossRefGoogle Scholar
  3. Cuny, G., Suteethorn, V., Kamha, S., Lauprasert, K., Srisuk, P. and Buffetaut, E. 2007. The Mesozoic fossil record of shark in Thailand. In Proceeding of the International Conference on Geology of Thailand: Towards Sustainable Development and Sufficiency Economy, ed. Tantiwaanit, W., 349–354. Bankok: Department of Mineral Resources.Google Scholar
  4. Cuny, G., C. Laojumporn, O. Ceychiw, and K. Lauprasert. 2010. Fossil vertebrate remains from Kut Island (Gulf of Thailand, Early Cretaceous). Cretaceous Research 31: 415–423.CrossRefGoogle Scholar
  5. Duffin, C.J. 1985. Revision of the hybodont selachian genus Lissodus Brough (1935). Palaeontographica, A 188: 105–152.Google Scholar
  6. Duffin, C.J. 2001. Synopsis of the selachian genus Lissodus Brough 1935. Neues Jahrbuch fur Geologie and Palaontologie Abhan-dlungen 221: 145–218.Google Scholar
  7. Huxley, T.H. 1880. On the application of the laws of evolution to the arrangement of the Vertebrata and more particularly of the Mammalia. Proceedings of the Zoological Society of London 1880: 649–662.Google Scholar
  8. Maisey, J.G. 1987. Cranial anatomy of the Lower Jurassic shark Hybodus reticulatus (Chondrichthyes: Elasmobranchii) with comments on hybodontid systematics. American Museum Novitates 2878: 1–39.Google Scholar
  9. Meesook, A. 2000. Cretaceous environments of Northeastern Thailand. In Cretaceous environment of Asia, ed. H. Okada, and N.J. Mateer, 207–223. Amsterdam: Elsevier Science B.V.CrossRefGoogle Scholar
  10. Meesook, A. 2011. Cretaceous. In The geology of Thailand, ed. M.F. Ridd, A.J. Barber, and M.J. Crow, 169–184. London: Geological Society of London.Google Scholar
  11. Patterson, C. 1966. British Wealden shark. Bull Br Museum (Natural History). Geol 11: 283–350.Google Scholar
  12. Rees, J., and C.J. Underwood. 2002. The status of the shark genus Lissodus Brough, 1935, and the position of nominal Lissodus species within the hybodontoidea (selachii). Journal of Vertebrate Paleontology 22(3): 471–479.CrossRefGoogle Scholar
  13. Sattayarak, N., S. Srigulawong, and M. Patarametha. 1991. Stratigraphy of the non-marine Khorat Group, Northern Thailand. In Seventh Regional Conference on Geology, Mineral Resources and Energy Resources of Southeast Asia (GEOSEA VII), ed. P. Polachan, P. Thanvarachorn, and V. Pisutha-Arnond, 5–8. Bankok: Geological Society of Thailand.Google Scholar
  14. Tumpeesuwan, S., Y. Sato, and S. Nakhapadungrat. 2010. A new species of Pseudohyria (Matsumotoina) (Bivalvia: Trigonioidoidea from the Early Cretaceous Sao Khua Formation, Khorat Group, Northeastern Thailand. Tropical Natural History 10(1): 93–106.Google Scholar

Copyright information

© Paläontologische Gesellschaft 2015

Authors and Affiliations

  • Suchada Khamha
    • 1
  • Gilles Cuny
    • 2
  • Komsorn Lauprasert
    • 1
  1. 1.Department of Biology, Faculty of ScienceMahasarakham UniversityKhamrieng, Kantharawichai DistrictThailand
  2. 2.UMR CNRS 5276 LGLTPE ENSUniversité Claude Bernard Lyon 1Villeurbanne CedexFrance

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