Theodoxus kalodictya (FOSSIL) (N.I. Andrusov, 1909 †)
Theodoxus karasuna A. Mousson
Theodoxus koslinskyi (FOSSIL) (Porumbaru, 1881 †)
Theodoxus lamellatus (FOSSIL) (Š. Brusina, 1892 †)
Theodoxus leobersdorfensis (FOSSIL) (Handmann, 1887 †)
Theodoxus licherdopoli (FOSSIL) (Stefanescu, 1896 †)
Theodoxus lineatus (FOSSIL) (Sinzov, 1896 †)
Theodoxus lituratus K.E.I. von Eichwald, 1838
Theodoxus longispina C.A. Récluz
Theodoxus lorkovici (FOSSIL) (Š. Brusina, 1878 †)
Theodoxus luteofasciatus (K. Miller, 1879)
Theodoxus lutetianus (FOSSIL) Monfort, 1810 †
Theodoxus macedonicus (FOSSIL) W.A. Wenz, 1943 †
Theodoxus macri (G.B. Sowerby, 1849)
Theodoxus maculosus (FOSSIL) Gozhik in Gozhik& Datsenko, 2007 †
Theodoxus maresi (J.R. Bourguignat, 1864)
Theodoxus marteli (P.M. Pallary, 1920)
Theodoxus marteli nigra (P.M. Pallary, 1918)
Theodoxus mayeri (FOSSIL) (C.G. Semper, 1867 †)
Theodoxus meridionalis R.A. Philippi, 1836
Theodoxus micans (FOSSIL) (Gaudry& Fischer in Gaudry, 1867 †)
Theodoxus milachevitchi A.N. Golikov& Y.I. Starobogatov, 1966
Theodoxus milessii (FOSSIL) Papp, 1979 †
Theodoxus militaris (FOSSIL) (M. von Neumayr, 1869 †)
Theodoxus miljkovici (FOSSIL) (Š. Brusina, 1902 †)
Theodoxus millepunctatus (FOSSIL) (Š. Brusina, 1902 †)
Theodoxus moeschi (FOSSIL) É.A.A. Locard, 1893 †
Theodoxus moosbrunnensis (FOSSIL) Papp, 1953 †
Theodoxus morellii (FOSSIL) (L.M.D. Bellardi& O.G. Michelotti, 1841 †)
Theodoxus morulus (FOSSIL) Kühn, 1963 †
Theodoxus mutinensis (FOSSIL) C. d'Ancona, 1869 †
Theodoxus neumayri (FOSSIL) (Burgerstein, 1877 †)
Theodoxus niloticus L.A. Reeve, 1856
Theodoxus nitens (FOSSIL) Gozhik, 2002 †
Theodoxus nivosus (FOSSIL) (Š. Brusina, 1874 †)