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Othnielosaurus
''Othnielosaurus'' is a genus of ornithischian dinosaur that lived about 155 to 148 million years ago, during the Late Jurassic-age Morrison Formation of the western United States. It is named in honor of famed paleontologist Othniel Charles Marsh, and was formerly assigned to the genus ''Laosaurus''. This genus was coined to hold fossils formerly included in ''Othnielia'', which is based on remains that may be too sparse to hold a name; as such, it is part of decades of research to untangle the taxonomy left behind by Marsh and his rival Edward Drinker Cope from the Bone Wars. ''Othnielosaurus'' has usually been classified as a hypsilophodont, a type of generalized small bipedal herbivore or omnivore, although recent research has called this and the existence of a distinct group of hypsilophodonts into question.
==Description==
''Othnielosaurus'' is known from material from all parts of the body, including two good skeletons, although the skull is still poorly known (note that earlier references use a multitude of names for this material, with most of them since 1977 using ''Othnielia rex''). ''Othnielosaurus'' was a small animal, 2 meters (6.6 ft) or less in length and 10 kilograms (22 lb) or less in weight. It was a bipedal dinosaur with short forelimbs and long hindlimbs with large processes for muscle attachments.〔(【引用サイトリンク】title=othnielia )〕 The hands were short and broad with short fingers. From the partial type skull and the skull on the possible specimen "Barbara", the head was small. It had small leaf-shaped cheek teeth (triangular and with small ridges and denticles lining the front and back edges), and premaxillary teeth with less ornamentation. Like several hypsilophodont or iguanodont-grade ornithopods such as ''Hypsilophodon'', ''Thescelosaurus'', and ''Talenkauen'', ''Othnielosaurus'' had thin plates lying along the ribs. Called intercostal plates, these structures were cartilaginous in origin.
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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