Ancistrosyrinx Dall, 1881 (original description)
Bathyopsis Cope, 1881 † (original description)
Catathlaeus Cope, 1881 † (original description)
Cecidotaea Packard & Cope, 1881 accepted as Caecidotea Packard, 1871 (original description)
Conoryctes Cope, 1881 † (original description)
Deltatherium Cope, 1881 † (original description)
Lipomyzon Cope, 1881 accepted as Chasmistes Jordan, 1878 (original description)
Milneria Dall, 1881 (original description)
Mioclaenus Cope, 1881 † (original description)
Periptychus Cope, 1881 † (original description)
Ptilodus Cope, 1881 † (original description)
Triisodon Cope, 1881 † (original description)