"Creodonta" was coined by Edward Drinker Cope in 1875. Cope included the oxyaenids and the viverravid "Didymictis" but omitted the hyaenodontids. In 1880. he expanded the term to include Miacidae, Arctocyonidae, Leptictidae (now Pseudorhyncocyonidae), Oxyaenidae, Ambloctonidae and Mesonychidae. Cope originally placed creodonts within the Insectivora. In 1884, however, he regarded them as a basal group from which both carnivorans and insectivorans arose. Hyaenodontidae was not included among the creodonts until 1909. Over time, various groups were removed, and by 1969 it contained, as it does today, only the oxyaenids and the hyaenodontids.