Freshwater crocodile,Crocodylus siamensis Schneider, 1801, from the Middle Pleistocene deposits in Chaloem Phrakiat District,Nakhon Ratchasima,Thailand |
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| Institution: | 1. Department of Biology, Faculty of Science, Mahasarakham University, 44150 Maha Sarakham, Thailand;2. Origin of life museum, Sukhothai Airport, Khlong Krachong Sub-District, Sawankhalok District, 64110 Sukhothai, Thailand;1. Natural Sciences Museum Piatra Neamţ, Petru Rareş No. 26, 610119 Piatra Neamţ, Romania;2. Institute of Geology of the Czech Academy of Sciences, Rozvojová 269, 16500 Prague 6, Czech Republic;3. “Alexandru Ioan Cuza” University of Iaşi, Department of Geology, 20A Carol I Blv, 700505 Iaşi, Romania;4. Dipartimento di Scienze della Terra, Università degli Studi di Torino, Via Valperga Caluso, 35, 10125 Torino, Italy;5. Institute of Geology and Palaeontology, Charles University, Albertov 6, 12843 Prague 2, Czech Republic;1. Division of Paleontology, Institute of Geosciences, University of Bonn, Nussallee 8, 53115 Bonn, Germany;2. Sirindhorn Museum, Department of Mineral Resources, Sahatsakhan, Kalasin 46140, Thailand;3. Dinosaur Institute, Natural History Museum of Los Angeles County, 900 Exposition Boulevard, Los Angeles, CA 90007, USA;1. Natural History Museum of Geneva, Department of Geology and Palaeontology, Route de Malagnou 1, CP 6434, CH-1211, Geneva 6, Switzerland;2. PALEVOPRIM, UMR CNRS 7262, Université de Poitiers, UFR SFA, 6, rue M. Brunet, TSA 51106, 86073, Poitiers Cedex 9, France;3. Palaios Association, 86300, Valdivienne, France;1. Sirindhorn Museum, Kalasin, Department of Mineral Resources, Bangkok, Thailand;2. Faculty of Humanities and Social Sciences, Khon Kaen University, Khon Kaen, Thailand;3. Phu Wiang Fossil Research Center and Dinosaur Museum, Khon Kaen, Thailand;1. Palaeontological Research and Education Centre, Mahasarakham University, Kantarawichai, 44150 Maha Sarakham, Thailand;2. CNRS (UMR 8538), Laboratoire de Géologie de l’Ecole Normale Supérieure, PSL Research University, 24 rue Lhomond, 75231 Paris Cedex 05, France;3. Department of Biology, Faculty of Science, Mahasarakham University, Kantarawichai, 44150 Maha Sarakham, Thailand;4. CNRS UMR 5276, LGL-TPE, université Claude-Bernard Lyon 1, CNRS école normale supérieure de Lyon, 69622 Villeurbanne Cedex, France;5. Department of Geology and Palaeontology, Muséum d’Histoire naturelle, CP6434, 1211 Genève 6, Switzerland;6. Laboratoire de Géologie de Lyon : Terre, Planète et Environnement, UMR CNRS 5276 (CNRS, ENS, Université Lyon 1), Ecole Normale Supérieure de Lyon, 69364 Lyon Cedex 07, France;7. Department of Mineral Resources, Rama VI Road, 10400 Bangkok, Thailand;8. Northeastern Research Institute of Petrified Wood and Mineral Resources, Nakhon Ratchasima Rajabhat University, Mueang, 30000 Nakhon Ratchasima, Thailand;9. Institut des Sciences de l’Evolution de Montpellier, CNRS/UM/IRD/EPHE, 2, Place Eugène Bataillon, cc64, 34095 Montpellier Cedex 5, France |
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| Abstract: | Two crocodilian anterior cranium parts from Takut Khon Village sand pit, Chaloem Phrakiat District, Nakhon Ratchasima Province, are presently described. Their morphology indicates that the specimens belong to a single species based on the presence of several similar characters such as a hole for the reception of the first dentary tooth at the anterior edge of the premaxillary bone; anterior tip of nasal elongate and projecting into the posterior margin of the external nares; wavy suture line between the posterior part of the nasal with the anterior margin of prefrontal and frontal processes. The cranium morphology is extremely close to Crocodylus siamensis Schneider, 1801 (Siamese crocodile) and conforming the existence of C. siamensis from the Middle Pleistocene in Thailand. |
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| Keywords: | Crocodylia Taxonomy Middle Pleistocene Thailand Crocodylia Taxonomie Pléistocène moyen Thaïlande |
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