This specimen stems from an individual substantially larger than the "C. nasicornis" holotype. This holotype specimen appears to have been lost. Dark pigment is also present in the eye region of the holotype and another specimen. Both specimens belonged to individuals equivalent in size to the holotype individual. In 2012, bite marks on two gastralia of the holotype specimen were reported. He estimated the "Giganotosaurus" holotype to have weighed , and the larger specimen . These first bones became the holotype of "Stegosaurus armatus". The femur of the holotype has a length of . The holotype thighbone is 44 centimetres long. The skull of the "Acrocanthosaurus atokensis" holotype shows light exostotic material on the squamosal. The holotype, cataloged as MTM V2009.192.1. Novozhilov (1964) later also described some pectoral remains associated with the holotype. The holotype, CCH6, comprises the upper right premolars and molars. R4992, including only isolated teeth sharing the same morphology as those from the holotype. This is the holotype of the species.