Cope named several other diadectids, including "Helodectes" in 1880, "Chilonyx" and "Empedias" in 1883, and "Bolbodon" in 1896. Paleontologist E.C. Case named four other diadectids: "Desmatodon" in 1908, "Diasparactus" in 1910, "Diadectoides" in 1911, and "Animasaurus" along with paleontologist Samuel Wendell Williston in 1912. Case and Williston considered Marsh's "Nothodon" and Cope's "Bolbodon" to be synonymous with "Diadectes". Marsh named "Nothodon" in the "American Journal of Science" only five days before Cope described "Diadectes" in "Proceedings of the American Philosophical Society". Under rules of the International Code of Zoological Nomenclature, the name "Nothodon" would have priority over "Diadectes", but because the name "Diadectes" has been in use since Case and Williston first synonymized the genera, "Diadectes" remains the accepted name.