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Sirindhorna, new basal hadrosauroid from Lower Cretaceous of Thailand (free pdf)
New in open access PLoS ONE:
Masateru Shibata, Pratueng Jintasakul, Yoichi Azuma & Hai-Lu You (2015)
A New Basal Hadrosauroid Dinosaur from the Lower Cretaceous Khok Kruat
Formation in Nakhon Ratchasima Province, Northeastern Thailand.
PLoS ONE 10(12): e0145904.
A new basal hadrosauroid dinosaur from the Lower Cretaceous Khok Kruat
Formation of Thailand, Sirindhorna khoratensis gen. et sp. nov is
described. The new taxon is based on composite skull and mandible
including premaxilla, maxilla, jugal, quadrate, braincases,
predentary, dentaries, surangular, and maxillary and dentary teeth. It
is diagnostic by such characters as, sagittal crest extending along
entire dorsal surface of the parietal and reaching the frontoparietal
suture (autapomorphy), transversely straight frontoparietal suture,
caudodorsally faced supraoccipital, no participation of the
supraoccipital in the foramen magnum, mesiodistally wide leaf-shaped
dentary tooth with primary and secondary ridges on the lingual surface
of the crown, perpendicularly-erected and large coronoid process of
dentary, and nonvisible antorbital fossa of the maxilla in lateral
view. Phylogenetic analysis revealed S. khoratensis as among the most
basal hadrosauroids. Sirindhorna khoratensis is the best-preserved
iguanodontian ornithopod in Southeast Asia and sheds new light to
resolve the evolution of basal hadrosauriforms.