The earliest record of Asian Eusuchia from the Lower Cretaceous Khok Kruat Formation of northeastern Thailand |
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| Institution: | 1. The University Museum, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan;2. Fukui Prefectural Dinosaur Museum, 51-11 Terao, Muroko, Katsuyama-Shi, Fukui, 911-8601, Japan;3. Dinosaur Research Institute, Fukui Prefectural University, 4-1-1 Kenjojima, Matsuoka, Eiheiji-Cho, Fukui, 910-1195, Japan;4. Northeastern Research Institute of Petrified Wood and Mineral Resources, Nakhon Ratchasima Rajabhat University, Mueang, Nakhon Ratchasima, 30000, Thailand;1. Fundación Conjunto Paleontológico de Teruel-Dinópolis/Museo Aragonés de Paleontología, Av. Sagunto s/n, Teruel, E-44002, Spain;2. C/ Almazán 17, 2º C, Soria, E-42004, Spain;1. División Paleontología Vertebrados, Museo de La Plata, Universidad Nacional de La Plata, Paseo del Bosque s/n., B1900FWA, La Plata, Argentina;2. CONICET, Consejo Nacional de Investigaciones Científicas y Técnicas, Argentina;3. Museo Carmen Funes, Av. Córdoba 55 (8318), Plaza Huincul, Neuquén, Argentina;4. Instituto Antártico Argentino, 25 de Mayo 1143, B1650HMK, San Martín, Buenos Aires, Argentina;5. Department of Palaeobiology, Swedish Museum of Natural History, P.O. Box 50007, SE-104 05 Stockholm, Sweden;6. Instituto de Investigacion en Paleobiología y Geología, Universidad Nacional de Río Negro, Av. Roca 1242 (8332), Gral. Roca, Río Negro Province, Argentina;1. Laboratorio y Museo de Dinosaurios, Facultad de Ciencias Exactas y Naturales, Universidad Nacional de Cuyo, Avenida Padre Contreras 1300, Edificio ECT, Parque General San Martín, 5500 Mendoza, Argentina;2. Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Argentina;3. Laboratory of Systematics and Taphonomy of Fossil Vertebrates, Department of Geology and Paleontology, Museu Nacional / Universidade Federal do Rio de Janeiro, Quinta da Boa Vista, s/n, São Cristóvão, 20940-040 Rio de Janeiro, RJ, Brazil;1. División Paleontología Vertebrados, Museo de La Plata, Universidad Nacional de La Plata, Paseo del Bosque s/n., B1900FWA, La Plata, Argentina;2. CONICET: Consejo Nacional de Investigaciones Científicas y Técnicas, Argentina;3. Red Paleontológica U-Chile, Laboratorio de Ontogenia y Filogenia, Departamento de Biología, Facultad de Ciencias, Universidad de Chile, Av. Las Palmeras, 3425, Santiago, Chile;4. Canterbury Museum, Rolleston Avenue, Christchurch, 8013, New Zealand;5. Department of Paleontology GNS Science, P.O.Box 30368, Lower Hutt, 5040 Courier, 1 Fairway Drive, Avalon, Lower Hutt, New Zealand;1. Museu de Paleontologia “Prof. Antonio Celso de Arruda Campos”, Centro de Artes, Praça do Centenário, 15910-000, Monte Alto, SP, Brazil;2. Museu de Paleontologia “Pedro Candolo”, Estação Cultura, Praça Farmacêutico Bruno Garisto, 15890-000, Uchoa, SP, Brazil;3. Universidade Federal do Rio de Janeiro, Instituto de Geociências, Departamento de Geologia, Cidade Universitária, Ilha do Fundão, Av. Athos da Silveira Ramos, 274, 21941-916, Rio de Janeiro, RJ, Brazil;1. School of Earth and Environmental Sciences, University of Portsmouth, Portsmouth PO1 3QL, UK;2. School of Museum Studies, University of Leicester, 19 University Road, Leicester LE1 7RF, UK;3. Department of Biology and Biochemistry, Milner Centre for Evolution, University of Bath, Bath BA2 7AY, UK |
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| Abstract: | We describe remains of a new crocodyliform found from the Lower Cretaceous (Aptian) Khok Kruat Formation, northeastern Thailand. Remains consist of two caudal ends of mandibles, two rostral symphyseal parts of right rami of mandibles, a dorsal part of postorbital, a cranial end of squamosal and one osteoderm. Phylogenetic analyses supported inclusion of this crocodyliform into the Eusuchia as it shares several morphological characters with other eusuchians, such as a dorsocaudally oriented retroarticular process, smooth lateral surface of the caudoventral region of mandible, and a craniocaudally oriented ridge on the dorsal surface of retroarticular process. The shape of symphyseal region showed this crocodyliform had a longirostrine snout shape, which is uncommon in early eusuchians. Finding of this crocodyliform draws back the oldest record of Asian eusuchians, which was Tadzhikosuchus, approximately 30 million years and it is the only Mesozoic eusuchian found in East and Southeast Asia. |
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| Keywords: | Khok Kruat Formation Aptian Eusuchia Thailand Asia |
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