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Hypselospinus
''Hypselospinus'' is a genus of iguanodontian dinosaur which was first described as a species of ''Iguanodon'' (''I. fittoni'') by Richard Lydekker in 1889, the specific name honouring William Henry Fitton.
In May 2010 the fossils comprising ''Hypselospinus'' were by David Norman reclassified as a separate genus, among them the holotype BMNH R1635, consisting of a left ilium, a sacrum, tail vertebrae and teeth. The generic name is derived from Greek ''hypselos'', "high" and Latin ''spina'', "thorn", in reference to the high vertebral spines. Later that same year, a second group of scientists independently re-classified ''I. fittoni'' into a new genus they named ''Wadhurstia'',〔Carpenter, K. and Ishida, Y. (2010). "(Early and “Middle” Cretaceous Iguanodonts in Time and Space. )" ''Journal of Iberian Geology'', 36 (2): 145-164.〕 which thus is a junior objective synonym of ''Hypselospinus''. ''Hypselospinus'' lived during the lower Valanginian stage, around 140 million years ago.〔 A contemporary of ''Barilium'' (also once thought to be a species of ''Iguanodon''), ''Hypselospinus'' was a lightly built iguanodontian estimated at 6 metres (19.7 ft) long. The species ''Iguanodon fittoni'' was described from the lower Valanginian-age Lower Cretaceous Wadhurst Clay〔 of East Sussex, England. Remains from Spain may also pertain to it. Norman (2004) wrote that three partial skeletons are known for it,〔 but this is an error.
''Hypselospinus'' is separated from ''Barilium'' on the basis of vertebral and pelvic characters, size, and build.〔 For example, ''Barilium'' was more robust than ''Hypselospinus'', with large ''Camptosaurus''-like vertebrae featuring short neural spines, whereas ''Hypselospinus'' is known for its "long, narrow, and steeply inclined neural spines".〔
==References==
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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