Invalid names: Dipriodon lunatus Marsh 1889 [synonym], Halodon sculptus Marsh 1889 [synonym], Meniscoessus borealis Simpson 1927 [synonym], Meniscoessus greeni Wilson 1987 [synonym], Oracodon anceps Marsh 1889 [synonym], Oracodon conulus Marsh 1892 [synonym], Selenacodon fragilis Marsh 1889 [synonym], Tripriodon coelatus Marsh 1889 [synonym]