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Bulletin de la Societe Geologique de France; May 2007; v. 178; no. 3; p. 201-216; DOI: 10.2113/gssgfbull.178.3.201
© 2007 Societe Geologique de France
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Un nouveau goniopholididé, Siamosuchus phuphokensis, du Crétacé inférieur (anté-Aptien) du Nord-Est de la Thaïlande

Komsorn Lauprasert1, Gilles Cuny2, Eric Buffetaut3, Varavudh Suteethorn4 and Kumthorn Thirakhupt5

1 Biological Science PhD Program, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand. kumthorn{at}mail.sc.chula.ac.th
2 Geological Museum, University of Copenhagen, Øster Voldgade 5-7, 1350 Copenhagen K, Denmark.
3 CNRS (UMR 8538), 16 cour du Liégat, 75013 Paris, France.
4 Bureau of Geological Survey, Department of Mineral Resources, Rama VI Road, Bangkok 10400, Thailand.
5 Department of Biology, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand.

Un nouveau taxon de crocodile Goniopholididés brévirostre, Siamosuchus phuphokensis, n. g., n. sp., a été découvert dans la formation Sao Khua (anté-Aptien) du nordest de la Thaïlande. Le spécimen est décrit sur la base d’un squelette incomplet comprenant les prémaxillaires, maxillaires, nasaux, lacrymal gauche, frontal, jugal gauche, postor-bitaire droit, partie caudale du toit cranien, la plupart du squelette postcranien droit, et plusieurs ostéodermes fortement ornementés. S. phuphokensis se distingue des autres Goniopholididés brévirostres sur la base des caractères suivants : participation des nasaux à la bordure de la narine; présence d’une ride médiane haute et robuste sur la surface interorbitaire; bord latéral du frontal formant le bord médial de l’orbite; le supraoccipital en forme de large pentagone. Une analyse phylogénétique fondée sur la distribution de 101 caractères chez 29 taxa de mésoeucrocodiliens et trois "outgroups" confirme la monophylie de la famille des Goniopholididés. De plus, le spécimen thaïlandais forme un clade avec les Goniopholis européens. Sur la base de notre arbre de strict consensus, le genre Goniopholis n’inclut que les formes européennes.

Key Words: Crocodylia • Thailande • Crétacé inférieur • Phylogénie




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