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Leaellynasaura
''Leaellynasaura'' (meaning "Leaellyn's lizard") is a genus of small herbivorous ornithischian dinosaurs from the Albian stage of the Early Cretaceous (dated to between 118 and 110 million years ago〔Holtz, Thomas R. Jr. (2012) ''Dinosaurs: The Most Complete, Up-to-Date Encyclopedia for Dinosaur Lovers of All Ages,'' (Winter 2011 Appendix. )〕), first discovered in Dinosaur Cove, Australia. The only known species is ''Leaellynasaura amicagraphica''. It was described in 1989, and named after Leaellyn Rich, the daughter of the Australian palaeontologist couple Tom Rich and Patricia Vickers-Rich who discovered it. The specific name ''L. amicagraphica'' translates to "friend writing" and honours both the Friends of the Museum of Victoria and the National Geographic Society for their support of Australian paleontology.〔Rich, T. and Rich, P. (1989). “Polar dinosaurs and biotas of the Early Cretaceous of southeastern Australia.” ''National Geographic Research'', 5(1): 15-53.〕
==Description==
''Leaellynasaura'' is known from several specimens including two nearly complete skeletons and two fragmentary skulls. It has been variously described as a hypsilophodontid, a primitive iguanodontian and primitive ornithischian (Genasauria). The most recent assessment describes it as a non-iguanodontian ornithopod.〔Federico L. Agnolin, Martın D. Ezcurra, Diego F. Pais and Steven W. Salisbury (2010). "A reappraisal of the Cretaceous non-avian dinosaur faunas from Australia and
New Zealand: evidence for their Gondwanan affinities" Journal of Systematic Palaeontology, 8 (2) ()〕
Herne (2009) argued that, unlike more advanced ornithischians, ''Leaellynasaura'' lacked ossified tendons in its tail. He also argued that the tail is noteworthy as among the longest relative to its body size of any ornithischian: the tail was three times as long as the rest of the body combined; it also has more tail vertebrae than any other ornithischians except for some hadrosaurs.〔Herne, M. (2009). "Postcranial osteology of ''Leaellynasaura amicagraphica'' (Dinosauria; Ornithischia) from the Early Cretaceous of southeastern Australia." ''Journal of Vertebrate Paleontology'', 29(3): 33A.()〕 However, in a subsequent revision of fossil material attributed to ''Leaellynasaura'' Herne (2013) could not confidently assign the postcranial skeletons with long tails (or indeed any fossils other than the holotype incomplete cranium MV P185991, right maxilla MV P186352 and left maxillary tooth MV P186412, all from late Aptian-early Albian Eumeralla Formation) to ''Leaellynasaura amicagraphica''.〔Herne, M. (2013). "(Anatomy, systematics and phylogenetic relationships of the Early Cretaceous ornithopod dinosaurs of the Australian-Antarctic rift system )" PhD Thesis. The University of Queensland〕
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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