Isomeria aequatoriana (J.G. Hidalgo, 1867)
Kimberleytrachia aequum F. Köhler, 2011
Austrochloritis agamemnon G.P.L.K. Gude, 1906
Satsuma akiratadai Kameda & H. Fukuda, 2015
Satsuma albida A. Adams, 1870
Beddomea albizonatus (L.A. Reeve, 1849)
Papuina albocarinata E.A. Smith, 1887
Yakuchloritis albolabris (H.A. Pilsbry & Y. Hirase,1902)
Amphidromus albulus J. Abbas & P. Krull, 2006
Planispira aldrichi J. Henderson, 1898
Torresitrachia alenae R.C. Willan, F. Köhler, V. Kessner& M.F. Braby, 2009
Megalacron alfredi (J.C. Cox, 1871)
Amphidromus alicetandiasae Parsons, 2016
Amplirhagada alicunda F. Köhler, 2011
Amplirhagada alkuonides F. Köhler, 2011
Papuina allasteri J.C. Cox, 1873
Galadistes alleni T. Iredale, 1943
Torresitrachia allouarni F. Köhler, 2011
Isomeria aloagana F.P. Jousseaume, 1887
Kimberleytrachia alphacentauri F. Köhler, 2011
Amplirhagada alta G.A. Solem, 1981
Amplirhagada alta crystalla G.A. Solem, 1981
Amplirhagada alta intermedia G.A. Solem, 1981
Westraltrachia alterna T. Iredale, 1939
Amphidromus alticola H.C. Fulton, 1896
Satsuma amanoi J.T. Kuroda, 1960
Sinumelon amatensis G.A. Solem, 1993
Torresitrachia amaxensis G.A. Solem, 1979
Papuina ambrosia (G.F. Angas, 1867)
Amphidromus ameliae B. Dharma, 2007
Camaena amphicora (J.F. Mabille, 1888)
Westraltrachia ampla G.A. Solem, 1984
Kimberleytrachia amplirhagadoides F. Köhler, 2011
Setobaudinia anatispretia G.A. Solem, 1985
Amplirhagada anderdonensis F. Köhler, 2010