In his original description of the Ceratosaurus nasicornis holotype and subsequent publications, Marsh noted a number of characteristics that were unknown in all other theropods known at the time.
W swym oryginalnym opisie holotypu Ceratosaurus nasicornis i kolejnych publikacjach Marsh zauważył cechy niespotykane u żadnego innego teropoda znanego w tamtych czasach.