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Sinornithoides
''Sinornithoides'' (meaning "Chinese bird form") is a genus of troodontid theropod dinosaurs containing the single species ''Sinornithoides youngi''. ''S. youngi'' lived during the Early Cretaceous (Aptian/Albian stage, around 113 million years ago).〔Sereno, P.C. (2010). "Taxonomy, cranial morphology, and relationships of parrot-beaked dinosaurs (Ceratopsia: ''Psittacosaurus'')." ''New Perspectives on Horned Dinosaurs''. Bloomington: Indiana, 21-58.〕 It measured approximately one meter long (3.3 ft). It lived in Inner Mongolia, China, and probably ate invertebrates and other small prey.
==Discovery==
In 1988, a Chinese-Canadian expedition discovered the remains of a small theropod near Huamuxiao, in the Ordos Basin of Inner Mongolia. ''Sinornithoides youngi'', the type species, was named and described in 1993/1994 by Dale Russell and Dong Zhiming based on this fossil specimen from the Lower Cretaceous Ejinhoro Formation. The generic name is derived from Latin ''Sinae'', "Chinese", and Greek ὄρνις, ''ornis'', "bird", en ~ειδής, ''~eides'', a suffix meaning "~like", in reference to the bird-like build. The specific name honours Yang Zhongjian.〔Russell, D. and Dong, Z. (1993). "A nearly complete skeleton of a new troodontid dinosaur from the Early Cretaceous of the Ordos Basin, Inner Mongolia, People's Republic of China." ''Canadian Journal of Earth Sciences'', 30: 2163-2173.〕
It is represented by a holotype, IVPP V9612, an almost complete skeleton with skull, which is articulated and nearly complete except for the roof of the skull, some cervical and many dorsal vertebrae, along with some other referred skeletal elements. The holotype is preserved in much the same roosting position as another troodontid fossil, that of ''Mei long'', with its snout tucked under its left hand. It represents a subadult individual.〔Currie, P. and Dong, Z. (2001). "New information on Cretaceous troodontids from the People's Republic of China." ''Canadian Journal of Earth Sciences'', 38: 1753–1766. 〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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