Corylophidae LeConte, 1852
Clypastraea amabilis (LeConte, 1852)
Clypastraea angusticolle (Scott, 1908)
Clypastraea balteata (Matthews, 1899)
Clypastraea biguttata (LeConte, 1879)
Clypastraea decora (Casey, 1900)
Clypastraea fasciata (Say, 1827)
Clypastraea fuscum Harold, 1875
Clypastraea lepida (LeConte, 1852)
Clypastraea lugubris (LeConte, 1852)
Clypastraea lunata (LeConte, 1852)
Clypastraea montana (Casey, 1900)
Clypastraea nigra (Casey, 1900)
Clypastraea obesa (Casey, 1900)
Clypastraea obscura (LeConte, 1852)
Clypastraea ornata (Casey, 1900)
Clypastraea parvula (Casey, 1900)
Clypastraea specularis (Casey, 1900)
Sacium nanum Muls.Rey, 1861
Sacium pusillum (Gyll., 1810)