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Aardonyx
''Aardonyx'' (Afrikaans ''aard'', "earth" + Greek ''onux'', "nail, claw") is a genus of prosauropod dinosaur. It is known from the type species ''Aardonyx celestae'' found from the Lower Jurassic Elliot Formation of South Africa. ''A. celestae'' was named after Celeste Yates, who prepared much of the first known fossil material of the species. It has arm features that are intermediate between prosauropods and sauropods.
Based on the structure of the hind limbs and pelvic girdle of ''Aardonyx'', the dinosaur normally moved bipedally but could drop to quadrupedal movement similar to ''Iguanodon''. It shares some attributes with giant quadrupedal sauropods like ''Apatosaurus''.〔Associated Press (November 11, 2009). (Scientists: New dinosaur species found in South Africa ). NPR.〕 Australian〔 paleontologist Adam Yates and his team's discovery of the genus was published online before print in ''Proceedings of the Royal Society B'' in November 2009, and was scheduled to appear in the March 2010 issue.〔 British paleontologist Paul Barrett of the Natural History Museum, London, who was not involved in the research, commented that the discovery of ''Aardonyx'' "helps to fill a marked gap in our knowledge of sauropod evolution, showing how a primarily two-legged animal could start to acquire the specific features necessary for a life spent on all-fours".〔
According to Dr. Matthew Bonnan, a co-author on the study, "We already knew that the earliest sauropods and near-sauropods would be bipeds. What ''Aardonyx'' shows us, however, is that walking quadrupedally and bearing weight on the inside of the foot is a trend that started very early in these dinosaurs, much earlier than previously hypothesized." Bonnan adds, "On a scientific level, it's really fulfilling to have a hypothesis on how you think dinosaurs got large, then to test that in the field and get back these kind of data — a new dinosaur — that really does start to fill in some of those anatomical gaps."
==Description==
The genus is known from disarticulated bones belonging to two immature individuals. The material consists of cranial elements, vertebrae, dorsal and cervical ribs, gastralia, chevrons, elements of the pectoral and pelvic girdles, and bones of the fore and hind limbs, manus, and pes. The presence of these bones in a single dense accumulation in a localized channel fill suggests that they came from relatively complete carcasses. Both individuals are thought to have been less than 10 years old at the time of their death because of the lack of peripheral rest lines in the cortices of sampled bones. Additional evidence for immaturity at the time of death includes calcified cartilage at the articular end of the scapula.〔
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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