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In page Monolophosaurus:

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In 2006, Thomas Carr suggested that Guanlong, another theropod with a large, thin, and fenestrated midline crest and from the same formation, was in fact a subadult individual of Monolophosaurus. Usually Guanlong had been considered a proceratosaurid tyrannosauroid, but Carr had performed an analysis in which both specimens clustered and were allosauroids.[7] More conservatively, in 2010 Gregory S. Paul renamed Guanlong into a Monolophosaurus species, Monolophosaurus wucaii,[8] presuming the taxa might be sister species. In 2010, Brusatte e.a. rejected the identity, pointing out that the Guanlong holotype was actually a fully adult individual.[5]