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[dinosaur] Eusuchian from Lower Cretaceous Khok Kruat Formation of Thailand




Ben Creisler
bcreisler@gmail.com


A new paper. (I haven't seen the full text yet and don't know if it names a new taxon, though.)


Tai Kubo, Masateru Shibata, Wilailuck Naksri, Pratueng Jintasakul & Yoichi Azuma (2017)
The earliest record of Asian Eusuchia from the Lower Cretaceous Khok Kruat Formation of northeastern Thailand.
Cretaceous Research (advance online publication)
doi: https://doi.org/10.1016/j.cretres.2017.05.021
http://www.sciencedirect.com/science/article/pii/S019566711630266X#MMCvFirst



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.