Strumosa abanti (R.A.M. Brandt, 1961)
Oospira abbreviata (E.C. Von Martens, 1867)
Hemiphaedusa abei J.T. Kuroda, 1980
Agathylla abrupta (H.C. Küster, 1845)
Formosana abscedens Hunyadi & Szekeres, 2016
Oospira abstrusa (M. Szekeres, 1970)
Sericata abyssoclista (O. Böttger, 1883)
Oospira acehensis B. Dharma & M. Szekeres,2009
Euxina achrafensis H. Nordsieck, 1995
Nannophaedusa acicula H. Nordsieck, 2012
Lindholmiella aciculata (A.R.J.B. Bavay& P. Dautzenberg, 1909)
Synprosphyma acrostoma (A.R.J.B. Bavay& P. Dautzenberg, 1909)
Euphaedusa aculus (W.H. Benson, 1842)
Euphaedusa aculus fulvella P.M. Heude, 1882
Euphaedusa aculus gracilis T.C. Yen, 1939
Euphaedusa aculus labio P.V. Gredler, 1878
Euphaedusa aculus moellendorffi (E.C. Von Martens, 1874)
Euphaedusa aculus nankingensis P.M. Heude, 1882
Euphaedusa aculus orphanuli (P.M. Heude, 1882)
Euphaedusa aculus papillacea P.V. Gredler, 1884
Euphaedusa aculus shanghaiensis (L. Pfeiffer, 1852)
Mucronaria acuminata (A. Mousson, 1876)
Symptychiella acuminata H. Nordsieck, 2010
Columbinia adamsiana (L. Pfeiffer, 1860)
Euphaedusa adaucta P.V. Gredler, 1889
Stereophaedusa addisoni (H.A. Pilsbry, 1901)
Stereophaedusa addisoni habei J.T. Kuroda, 1963
Medora adensameri H. Nordsieck, 2009
Miranenia admirabilis (F.E. Loosjes& F.E. Loosjes, 1989)
Albinaria adrianae E. Gittenberger, 1979
Isabellaria adriani (E. Gittenberger, 1987)
Tyrannozaptyx adulta F. Käufel, 1930
Incaglaia adusta (O. Böttger, 1880)
Incaglaia adusta callistoglypta (H.A. Pilsbry, 1949)
Incaglaia adusta olssoni (H.A. Pilsbry, 1949)