Ariolimax californicus J.G. Cooper, 1872 USA, California
Ariolimax columbianus (A.A. Gould, 1851) Mexico
Ariolimax costaricensis T.D.A. Cockerell, 1890 Costa Rica
Ariolimax dolichophallus A.R. Mead, 1943 California, Saratoga
Hesperarion hemphilli (W.G. Binney, 1875) California. Los Angeles
Zacoleus idahoensis H.A. Pilsbry, 1903 USA, Idaho
Udosarx lyrata G.R. Webb, 1959 Oregon
Hesperarion mariae R.M. Branson, 1991
Magnipelta mycophaga H.A. Pilsbry, 1953 Canada, British Columbia
Hesperarion niger (J.G. Cooper, 1872) California, San Francisco
Hesperarion plumbeus B. Roth, 2004