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Koparion
''Koparion'' is a genus of small coelurosaurian theropod dinosaurs (probably troodontids), from the late Jurassic Period (Kimmeridgian stage), of Utah. It contains the single named species ''Koparion douglassi'' which is known only from a single isolated tooth.
==Discovery and history==
In 1993, Daniel Chure and Brooks Britt reported the discovery of small theropod remains, found by screenwashing large amounts of earth in the Rainbow Park near Dinosaur National Monument in Uintah County, Utah.〔Chure, D.J. and Britt, B.B., 1993, "New data on theropod dinosaurs from the Late Jurassic Morrison Fm. (MF)", ''Journal of Vertebrate Paleontology'' 13(3): 30A〕 In 1994, Chure named and described a unique tooth as the type specimen of the new species ''Koparion douglassi''. The generic name ''Koparion'' comes from the Ancient Greek κοπάριον, "small surgical knife", in reference to the small size of the tooth. The specific name honors Earl Douglass, who, in the early twentieth century, excavated the Dinosaur National Monument quarry.〔
The holotype specimen, DINO 3353, was found in the Brushy Basin Member of the Morrison Formation dating from the late Kimmeridgian, about 151 million years old.〔 The taxon is thus present in stratigraphic zone 6 of the Morrison Formation.〔Foster, J. (2007). "Appendix." ''Jurassic West: The Dinosaurs of the Morrison Formation and Their World''. Indiana University Press. pp. 327-329.〕 The specimen consists of a single maxillary (upper cheek) tooth crown (the root is missing). It cannot be determined whether it represents a left or a right tooth.〔
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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