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Gallimimus
''Gallimimus'' ( ; meaning "chicken or rooster mimic") is a genus of ornithomimid theropod dinosaurs from the late Cretaceous period (Maastrichtian stage) Nemegt Formation of Mongolia. With individuals as long as ,〔 it was one of the largest ornithomimosaurs.〔 ''Gallimimus'' is known from multiple individuals, ranging from juvenile (about 0.5 m tall at the hip) to adult (about 2 m tall at the hip).
==Description==
''Gallimimus'' was rather ostrich-like, with a small head, toothless beak, large eyes, a long neck, short arms, long legs, and a long tail. A diagnostic character of ''Gallimimus'' is a distinctly short 'hand' relative to the humerus length, when compared to other ornithomimids. The tail was used as a counterbalance. The eyes were located on the sides of its head, meaning that it did not possess binocular vision. Like most modern birds and other theropods, it had hollow bones. ''Gallimimus'' had a number of adaptations which suggest good running ability, such as a strong ilium, heavy tail base, long limbs, a long tibia and metatarsus, and short toes, but it is unknown how fast it could run. All ornithomimids had long skulls, but that of ''Gallimimus'' was exceptionally elongated, due to an elongation of the snout. The snouts of the juvenile specimens are much shorter.
Norwegian researcher Jørn H. Hurum in 2001 published a detailed description of a complete lower jaw bone from ''Gallimimus bullatus''.〔 He observed that the bones composing the jaw were "paper thin", and corrects minor mistakes made in previous reconstructions of the lower jaw of ''G. bullatus''.〔 He also observed that the tight intramandibular joint would prevent any movement between the front and rear portions of the lower jaw.〔
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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