Siamodon

Norman, David B., 2015, On the history, osteology, and systematic position of the Wealden (Hastings group) dinosaur Hypselospinus fittoni (Iguanodontia: Styracosterna), Zoological Journal of the Linnean Society 173 (1), pp. 92-189 : 152

SIAMODON NIMNGAMI BUFFETAUT & SUTEETHORN, 2011

Siamodon is based upon a well-preserved isolated maxilla with some teeth still in place. In addition, an isolated tooth and partial neurocranium have also been referred to this taxon. The material was collected at Ban Saphan Hin, Nakhon Ratchasima Province, northeast Thailand, from the Khok Kruat Formation (Aptian – Buffetaut & Suteethorn, 2011: 52). These specimens are based upon material that cannot be compared directly with the hypodigm of Hy. fittoni .

Taxonomic note

The diagnosis of this taxon does not include any autapomorphic states, which suggests that until more material is collected and described, this taxonomic name should be considered a nomen dubium. It is possible that this material is referable to Ratchasimasaurus , which was described (almost simultaneously) by another group of researchers ( Shibata, Jintasakul & Azuma, 2011). However, the latter authors suggest (based upon undescribed maxillae) that there may have been two distinct taxa in the Khok Kruat Formation.