Ariolimax californicus J.G. Cooper, 1872
Ariolimax columbianus (A.A. Gould, 1851)
Ariolimax costaricensis T.D.A. Cockerell, 1890
Ariolimax dolichophallus A.R. Mead, 1943
Hesperarion hemphilli (W.G. Binney, 1875)
Zacoleus idahoensis H.A. Pilsbry, 1903
Udosarx lyrata G.R. Webb, 1959
Hesperarion mariae R.M. Branson, 1991
Magnipelta mycophaga H.A. Pilsbry, 1953
Hesperarion niger (J.G. Cooper, 1872)
Hesperarion plumbeus B. Roth, 2004