An Eocene tomistomine from peninsular Thailand |
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| Affiliation: | 1. Laboratoire de Géologie de Lyon : Terre, Planète et Environnement, UMR CNRS 5276 (CNRS, ENS, Université Lyon 1), École Normale Supérieure de Lyon, 69364 Lyon cedex 07, France;2. Palaeontological Research and Education Centre, Mahasarakham University, 44150 Khamrieng, Thailand;3. Laboratoire de Géologie de l’Ecole Normale Supérieure, CNRS (UMR 8538), 24 rue Lhomond, 75231 Paris cedex 05, France;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. Chongqing Laboratory of Geoheritage Protection and Research, No. 208 Hydrogeological and Engineering Geological Team, Chongqing Bureau of Geological and Mineral Resource Exploration and Development, 400700 Chongqing, China;2. Key Laboratory of Vertebrate Evolution and Human Origins of Chinese Academy of Sciences, Institute of Vertebrate Paleontology and Paleoanthropology, Chinese Academy of Science, 100044 Beijing, China;3. CNRS (UMR 8538), Laboratoire de Géologie de l’École Normale Supérieure, PSL Research University, 24, rue Lhomond, 75231 Paris Cedex 05, France;4. Palaeontological Research and Education Centre, Mahasarakham University, Kantarawichai, 44150 Maha Sarakham, Thailand;5. Chongqing Institute of Geological Survey, 401122 Chongqing, China;1. Max Planck Institute for the Science of Human History–Department of Archaeology, Kahlaische Straβe 10, 07745 Jena, Germany;2. INRAP-UMR 7209 “Archéozoologie, Archéobotanique : Sociétés, pratiques et environnements”, MNHN, 36, Avenue Paul-Vaillant-Couturier, 93120 La Courneuve, France;3. UMR CNRS 5554 “Institut des Sciences de l’Évolution de Montpellier”, Place Eugène-Bataillon, CP 065, 34095 Montpellier cedex 05, France;4. Nakhonratchasima Rajabhat University, 340 Suranarai Road, 30000 Nakhonratchasima, Thailand;5. Silpakorn University–Faculty of Archaeology, 31 Naphralan Rd, Phranakorn, Bangkok, Thailand;6. UMR 7207 CR2P « Centre de Recherche en Paléontologie–Paris » CNRS-Sorbonne Université-MNHN, Université Pierre et Marie Curie, T. 46-56, 5e Étage, Case 104, 4, Place Jussieu, 75252 Paris Cedex 05, France;1. CNRS, UMR 8538, Laboratoire de géologie de l’École normale supérieure, PSL Research University, 23, rue Lhomond, 75231 Paris cedex 05, France;2. Palaeontological Research and Education Centre, Mahasarakham University, Khamrieng Sub-district, Kantharawichai District, Maha Sarakham Province 44150, Thailand;3. Department of Mineral Resource, Rama VI Road, Bangkok 10400, Thailand;1. Dipartimento di Scienze Biologiche, Geologiche e Ambientali, Alma Mater Studiorum, Università di Bologna, Via Zamboni 67, 40126 Bologna, Italy;2. Museo Geologico Giovanni Capellini, Alma Mater Studiorum, Università di Bologna, Via Zamboni 63, 40126 Bologna, Italy;3. Department of Biological Sciences, University of Alberta, Edmonton, T6G 2E9 Alberta, Canada;4. Office National Des Mines, Service Patrimoine Géologique, 24 Rue de l''Energie 8601, La Charguia, 2035 Tunis, Tunisia;5. Museo Civico di Scienze Naturali Malmerendi, Via Medaglie d''Oro 51, 48018 Faenza, Italy |
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| Abstract: | Skull and mandibular elements of a tomistomine crocodilian are described from the late Eocene to early Oligocene lignite seams of Krabi, peninsular Thailand. The Thai tomistomine is a longirostrine form characterized by a rostrum/skull ratio of about 0.6; a mandibular symphysis reaching the level of the eleventh alveolus; a deep participation of the splenial in the symphysis to the level of the ninth alveolus; an enlarged fifth maxillary alveolus; long nasals reaching the premaxillae at the level of the fifth maxillary alveolus but not contributing to the external nares; undivided posterior processes of premaxillae; a short prefrontal, excluded by a longer lacrimal from the posteromedial margin of maxillae; vomers visible on the palate. A phylogenetic analysis recovers the Thai specimen among derived tomistomines, on the stem lineage of the extant Tomistoma schlegelii, as a close ally of Maomingosuchus petrolica, a late Eocene tomistomine from southern China. The present recognition of Maomingosuchus sp. in late Eocene Thai deposits expands the distribution of Eocene tomistomines from southern China to the tropics. The origin of Tomistominae in Asia is briefly discussed. |
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| Keywords: | Tomistomine Eocene Oligocene Thailand Tomistominés Éocène Oligocène Thaïlande |
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