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Aerosteon riocoloradensis  represents one of the most complete megaraptorans yet discovered. This theropod comes from Anacleto Formation (Campanian) of Mendoza Province, Argentina. The aims of this contribution are: to present a detailed, bone by bone description of this specimen with figures of each bone; provide comparisons to other closely related theropods; revise the original assignation and diagnosis of such taxa. Three bones were re-assigned and almost all the autapomorphies of  Aerosteon  were modified. Features in the vertebral columns, which are shared with other megaraptorans, show that these theropods shared features with basal coelurosaurs. Anatomical Abbreviations ACDL : Anterior centrodiapophyseal lamina;  CDF : Centrodiapophyseal fossa;  CPAL : Centroparapophyseal lamina;  CPRL : Centroprezygapophyseal lamina;  CPRF : Centroprezygapophyseal fossa;  CPR-CDF : Centroprezygapophyseal-centrodiapophyseal fossa;  Hye : Hyposphene;  Hym : Hypantrum;  ILT : Intervertebral ligament tuberosity;  IPOL : Infrapostzygapophysela lamina;  IZL : Intrazygapophyseal lamina;  PADL : Paradiapophyseal lamina;  PAD-CDF : Paradiapophyseal-centrodiapophsyeal fossa;  PCDL : Posterior centrodiapophyseal lamina;  POEL : Postzygaepipophysela lamina;  PODL : Postzygadiapophyseal lamina;  POSF : Postspinal fossa;  POCDF : Postzygapophsyeal-centrodiapophyseal fossa;  Poz : Postzygapophysis;  PRDL : Prezygadiapophyseal lamina;  PRPAF : Prezygaparapophyseal fossa;  PRPAL : Prezygaparapophyseal lamina;  PRSF : Prespinal fossa;  PRSL : Prespinal lamina;  PRD-CDF : Prezygadiapophyseal-centrodiapophyseal fossa;  PRD-PADF : Prezygadiapophyseal-paradiapophyseal fossa;  PRD-PODF : Prezygadiapophyseal-postzygadiapophyseal fossa;  PRCDF : Prezygapophyseal-centrodiapophyseal fossa;  Prz : Prezygapophyses;  SDF : Supradiapophsyeal fossa;  SDL : Supradiapophyseal lamina;  SPOF : Spinopostzygapophyseal fossa;  SPOL : Spinopostzygapophyseal lamina;  SPRF : Spinoprezygapophyseal fossa;  SPRL : Spinoprezygapophyseal lamina;  SR(number) : Sacral rib;  STP(number) : Sacral transverse process

Osteology of Aerosteon riocoloradensis (Sereno et al. 2008) a large megaraptoran (Dinosauria: Theropoda) from the Upper Cretaceous of Argentina