Xeroleuca abadi J. Ahuir Galindo, 2014
Xerosecta abarriana P.M. Pallary, 1923
Caucasigena abchasica W.A. Lindholm, 1927
Helicella aberrans (A. Mousson, 1863)
Caseolus abjectus (R.T. Lowe, 1851)
Geomitra acarinata J. Hemmen & K. Groh, 1985
Actinella actinophora (R.T. Lowe, 1831)
Actinella actinophora descendens (T.V. Wollaston, 1878)
Monachoides aculeatus (K.K. Uvalieva, 1964)
Xerosecta aderoualensis P.M. Pallary, 1923
Xeromagna adolfi (L. Pfeiffer, 1854)
Helicella adolphi (L. Pfeiffer, 1854)
Xerotricha adoptata (A. Mousson, 1872)
Leptaxis advena (P.B. Webb & S. Berthelot,1833)
Helicopsis aelleni B. Hausdorf, 1996
Cernuella aginnica (É.A.A. Locard, 1882)
Xerosecta ahmei (P.M. Pallary, 1898)
Xeropicta akrotirica E. Gittenberger, 1991
Xerocrassa albarracinensis G. Faci, 1991
Xerosecta albezini (P.M. Pallary, 1933)
Xerosecta albezini elevata (P.M. Pallary, 1933)
Monacha albocincta (P. Hesse, 1912)
Angiomphalia almalensis A.A. Schileyko& K.K. Uvalieva, 1978
Trichia alpicola (L. Eder, 1921)
Lindholmomneme altaica (C.A. Westerlund, 1896)
Xeromunda alticola B. Hausdorf, 1995
Suboestophora altimirai (A. Ortiz De Zárate,1962)
Cernuella amanda E.A. Rossmässler, 1838
Xerosecta amelilensis (P.M. Pallary, 1918)
Xerocrassa amphiconus (H. von Maltzan, 1883)
Metafruticicola andria (E.C. Von Martens, 1889)
Leucozonella angulata (C.A. Westerlund, 1896)
Monacha aniliensis P.L. Reischütz& H.A. Sattmann, 1990
Xeroleuca antoinei P.M. Pallary, 1936
Nienhuisiella antonellae F.L. Giusti & G. Manganelli,1987