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''Hypselorhachis'' is a genus of extinct reptile, possibly a ctenosauriscid archosaur related to ''Ctenosauriscus''. It lived during the Triassic Period. It is currently known only from a single vertebra found from the Middle Triassic Manda Beds in Tanzania. The type species is ''H. mirabilis'', mentioned but never fully described by English paleontologist Alan J. Charig. ''Hypselorhachis'' was assigned to the Ctenosauriscidae, a group of sail-backed archosaurs, in 1988.〔Carroll, R.L. (1988). ''Vertebrate Paleontology and Evolution''. W.H. Freeman and Company〕 It was formally described by Richard J. Butler and co-workers in 2009. ''Hypselorhachis'' is known from a single anterior dorsal vertebra found from the Lifua Member of the Manda Beds, which is thought to have been deposited during the Anisian stage. The only characteristic that diagnoses the genus is a feature seen in the prezygapophysis. Because of the lack of any other material, comparisons between it and other early archosaurs can only be based on features seen in the vertebrae, making any current phylogenetic classification tentative. Because the neural spine of the holotype is elongate, being over five times the height of the centrum, ''Hypselorhachis'' may be a ctenosauriscid.〔 Other ctenosauriscids such as ''Arizonasaurus'' and ''Ctenosauriscus'' possessed characteristically large sails that were formed from elongate neural spines. ==References== * ("Hypselorhachis" at DinoData.org ) * ("Hypselorhachis" at the Paleobiology Database ) * (Discussion of "Hypselorhachis" on the DML ) 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Hypselorhachis」の詳細全文を読む スポンサード リンク
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