1. Species Geomalacus anguiformis (Morelet, 1845)
2. Species Geomalacus grandis Simroth, 1894
3. Species Geomalacus indifferens (O. Boettger, 1884) †
4. Species Geomalacus maculosus Allman, 1843
5. Species Geomalacus malagensis Wiktor & Norris, 1991
6. Species Geomalacus oliveirae Simroth, 1891
7. Species Geomalacus pliocenicus Sacco, 1886 †
8. Subgenus Geomalacus (Letourneuxia) Bourguignat, 1866 accepted as Letourneuxia Bourguignat, 1866 (superseded generic combination)
   1. Species Geomalacus (Letourneuxia) marocanus Pollonera, 1916 accepted as Letourneuxia numidica Bourguignat, 1866 accepted as Letourneuxia nyctelia (Bourguignat, 1861) (junior synonym)
   2. Species Geomalacus (Letourneuxia) tournieri Pollonera, 1890 accepted as Letourneuxia numidica Bourguignat, 1866 accepted as Letourneuxia nyctelia (Bourguignat, 1861) (junior synonym)
9. Species Geomalacus bayani Jousseaume, 1876 accepted as Arion circumscriptus G. Johnston, 1828 accepted as Arion fasciatus (Nilsson, 1823) (unaccepted > junior subjective synonym)
10. Species Geomalacus bourguignati Mabille, 1867 accepted as Arion distinctus Mabille, 1868
11. Species Geomalacus hiemalis Drouët, 1867 accepted as Arion distinctus Mabille, 1868
12. Species Geomalacus mabillei Baudon, 1868 accepted as Arion distinctus Mabille, 1868
13. Species Geomalacus pliocaenicus [sic] † accepted as Geomalacus pliocenicus Sacco, 1886 † (unaccepted > misspelling)
14. Species Geomalacus vendeanus A. Letourneux, 1869 accepted as Arion distinctus Mabille, 1868
15. Subgenus Geomalacus (Arrudia) Pollonera, 1890 represented as Geomalacus Allman, 1843
    1. Species Geomalacus (Arrudia) anguiformis (Morelet, 1845) represented as Geomalacus anguiformis (Morelet, 1845)
    2. Species Geomalacus (Arrudia) malagensis Wiktor & Norris, 1991 represented as Geomalacus malagensis Wiktor & Norris, 1991
    3. Species Geomalacus (Arrudia) oliveirae Simroth, 1891 represented as Geomalacus oliveirae Simroth, 1891
16. Subgenus Geomalacus (Geomalacus) Allman, 1843 represented as Geomalacus Allman, 1843
    1. Species Geomalacus (Geomalacus) maculosus Allman, 1843 represented as Geomalacus maculosus Allman, 1843

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