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Purchase includes free access to book updates online and a free trial membership in the publisher's book club where you can select from more than a million books without charge. Chapters: Plateosaurus, Massospondylus, Aardonyx, Prosauropoda, Unaysaurus, Lufengosaurus, Yunnanosaurus, Riojasaurus, Gyposaurus, Massospondylidae, Mussaurus, Eucnemesaurus, Plateosauravus, Massopoda, Riojasauridae, Jingshanosaurus, Euskelosaurus, Plateosauria, Ruehleia, Thotobolosaurus, Anchisauria, Plateosauridae, Yimenosaurus, Lessemsaurus, Aetonyx, Coloradisaurus, Archaeodontosaurus, Fulengia, Gongxianosaurus. Excerpt: Aardonyx Fossil range: Early Jurassic , 195 Ma Pre O S D C P T J K Pg N 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 . 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 is 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 ear... |
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