IRMNG Taxon list
Anadenulus cockerelli (Hemphill, 1890)
Arion ater (Linnaeus, 1758)
Arion circumscriptus Johnston, 1828
Arion distinctus Mabille, 1868
Arion fasciatus (Nilsson, 1823)
Arion hortensis Ferussac, 1819
Arion intermedius (Normand, 1852)
Arion owenii Davies, 1979
Arion rufus (Linnaeus, 1758)
Arion silvaticus Lohmander, 1937
Arion subfuscus (Draparnaud, 1805)
Arion sylvaticus Lohmander, 1937 accepted as Arion silvaticus Lohmander, 1937
Binneya guadalupensis Pilsbry, 1927
Binneya notabilis J.G. Cooper, 1863
Gliabates oregonius Webb, 1959
Gliabatus oregonius Webb, 1959 accepted as Gliabates oregonius Webb, 1959
Hemphillia burringtoni Pilsbry, 1948
Hemphillia camelus Pilsbry & Vanatta, 1897
Hemphillia danielsi Vanatta, 1914
Hemphillia dromedarius Branson, 1972
Hemphillia glandulosa Bland & W.G. Binney, 1872
Hemphillia malonei Pilsbry, 1917
Hemphillia pantherina Branson, 1975
Hesperarion hemphilli (W.G. Binney, 1875)
Hesperarion mariae Branson, 1991
Hesperarion niger (J.G. Cooper, 1872)
Magnipelta mycophaga Pilsbry, 1953
Pallifera dorsalis (A. Binney, 1842)
Pallifera fosteri F.C. Baker, 1939
Pallifera hemphilli (W.G. Binney, 1885)
Pallifera marmorea Pilsbry, 1948
Pallifera megaphallica Grimm, 1961
Pallifera ohioensis (Sterki, 1908)
Pallifera pilsbryi C.D. Miles & Mead, 1960
Pallifera ragsdalei
Pallifera secreta (Cockerell, 1900)
Pallifera tournescalis Branson, 1968
Pallifera varia Hubricht, 1953
Prophysaon andersoni (J.G. Cooper, 1872)
Prophysaon boreale Pilsbry, 1948
Prophysaon coeruleum Cockerell, 1890
Prophysaon dubium Cockerell, 1890
Prophysaon fasciatum Cockerell, 1890
Prophysaon foliolatum (Gould, 1851)
Prophysaon humile Cockerell, 1890
Prophysaon obscurum Cockerell, 1890
Prophysaon vanattae Pilsbry, 1948
Udosarx lyrata Webb, 1959
Zacoleus idahoensis Pilsbry, 1903