摘要
Here we report a new iguanodontian dentary found from the Lower Cretaceous Khok Kruat Formation,Nakhon Ratchasima,northeast Thailand.A unique character,which is an elongated and flat shape of the dentary ramus,makes it possible to assign the specimen to the new genus of non-hadrosaurid iguanodontian,Ratchasimasaurus suranareae gen.et sp.nov.R.suranareae shows both primitive and derived characters,such as a caudally inclined coronoid process and alveolar trough with a primitive crown impression,and a derived buccal shelf between tooth row and coronoid process.The discovery of a new iguanodontian from the Indochina Terrene,considering that the previously reported 'Probactrosaurus-like' iguanodontian,points out a great diversity of this group in the late Early Cretaceous in Thailand,and corresponds to the Asian iguanodontian diversity at that time.
Here we report a new iguanodontian dentary found from the Lower Cretaceous Khok Kruat Formation,Nakhon Ratchasima,northeast Thailand.A unique character,which is an elongated and flat shape of the dentary ramus,makes it possible to assign the specimen to the new genus of non-hadrosaurid iguanodontian,Ratchasimasaurus suranareae gen.et sp.nov.R.suranareae shows both primitive and derived characters,such as a caudally inclined coronoid process and alveolar trough with a primitive crown impression,and a derived buccal shelf between tooth row and coronoid process.The discovery of a new iguanodontian from the Indochina Terrene,considering that the previously reported 'Probactrosaurus-like' iguanodontian,points out a great diversity of this group in the late Early Cretaceous in Thailand,and corresponds to the Asian iguanodontian diversity at that time.
基金
the Japan-Thailand Dinosaur Project 2007-2009,which is a collaborative research project between the Fukui Prefectural Dinosaur Museum(FPDM) and the Northeastern Research Institute of Petrified Wood and Mineral Resources,Nakhon Ratchasima Rajabhat University(NRRU)
