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Iliosuchus
''Iliosuchus'' (meaning "crocodile hipped") is a genus of theropod dinosaur known from Bathonian–age (169.2 – 164.4 mya) rocks of England. It was perhaps long.〔Holtz, Thomas R. Jr. (2008) ''Dinosaurs: The Most Complete, Up-to-Date Encyclopedia for Dinosaur Lovers of All Ages'' (Supplementary Information )〕
The only known fossils of this genus are three ilia (BMNH R83, OUM J29780 and OUM J28971) from Stonesfield Slate, Oxfordshire, England. From the holotype BMNH R83, Friedrich von Huene described and named the only species, ''I. incognitus'', in 1932.〔F. v. Huene (1932). "Die fossile Reptil-Ordnung Saurischia, ihre Entwicklung und Geschichte", ''Monographien zur Geologie und Palaeontologie, serie 1'' 4(1-2): 1-361〕 The generic name is derived from the ilium and Greek ''Souchos'', the crocodile god. The specific name means "unknown" in Latin. Another species, ''I. clevelandi'', was proposed in 1976 by Peter Galton,〔P. M. Galton, 1976, "''Iliosuchus'', a Jurassic dinosaur from Oxfordshire and Utah", ''Palaeontology'' 19(3): 587-589〕 who assigned ''Stokesosaurus clevelandi'' to ''Iliosuchus'', but this has not been followed.
The ''Iliosuchus'' ilia, very small with a length of nine to ten centimetres, have a vertical supra–acetabular ridge on the surface, similar to tyrannosaurids and many other predatory dinosaurs belonging to the group Tetanurae, including ''Piatnitzkysaurus'' and ''Megalosaurus''.〔Benson, R.B.J. (2009). "An assessment of variability in theropod dinosaur remains from the Bathonian (Middle Jurassic) of Stonesfield and New Park Quarry, UK and taxonomic implications for ''Megalosaurus bucklandii'' and ''Iliosuchus incognitus''." ''Palaeontology'' 52 857-877, ()〕 Such incomplete material is inadequate for accurate classification; nonetheless, ''Iliosuchus'' has sometimes been considered a tyrannosaurid ancestor. This is unlikely to be correct as the bones cannot be distinguished from small individuals of ''Megalosaurus'', a megalosaurid. Whatever the case, ''Iliosuchus'' is not diagnostic and is therefore dubious.〔Benson, R.B.J. (2009). "An assessment of variability in theropod dinosaur remains from the Bathonian (Middle Jurassic) of Stonesfield and New Park Quarry, UK and taxonomic implications for ''Megalosaurus bucklandii'' and ''Iliosuchus incognitus''." ''Palaeontology'' 52, 857-877, 〕 If ''Iliosuchus incognitus'' is a tyrannosauroid, it would be the earliest one yet, preceding ''Guanlong'', otherwise the earliest recognized tyrannosauroid, by several million years.
==See also==
* Timeline of tyrannosaur research
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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