Perrottetia aberrata (L.F.A. Souleyet, 1852)
Streptartemon abunaensis (F.C. Baker, 1913)
Raffraya acicula (P.M.A. Morelet, 1877)
Parvedentulina acutapex K.C. Emberton & T.A. Pearce,2000
Oophana acuticarinata W.S.S. Van Benthem-Jutting,1961
Gulella adamsiana (L. Pfeiffer, 1859)
Ptychotrema aequatoriale (H.A. Pilsbry, 1919)
Edentulina affinis C.R. Böttger, 1913
Discartemon afthonodontia T. Siriboon & S. Panha,2014
Gulella albersi (L. Pfeiffer, 1854)
Gulella alleni B. Verdcourt, 1974
Gulella alutacea T. Kira, 1955
Streptaxis alveus (R.W. Dunker, 1845)
Gulella amaniensis B. Verdcourt, 1953
Gulella ambalaniranae K.C. Emberton, 2001
Gulella ambanikelia K.C. Emberton, 2001
Parvedentulina ambatomitatoae K.C. Emberton, 2002
Parvedentulina ambatosorotrae K.C. Emberton, 2002
Gulella ambatovakiae K.C. Emberton, 2001
Parvedentulina ambatovakiae K.C. Emberton, 2002
Gulella ambodipelomosiae K.C. Emberton, 2002
Edentulina ambongoaboae K.C. Emberton, 1999
Gulella amboniensis P. Tattersfield, 1998
Edentulina ambra K.C. Emberton, 1999
Edentulina analamerae (K.C. Emberton, 1999)
Haploptychius anceyi (J.F. Mabille, 1887)
Haploptychius andamanicus (W.H. Benson, 1860)
Parvedentulina andapae K.C. Emberton, 2002
Parvedentulina andavakoerae K.C. Emberton, 2002
Gulella andreana E. Fischer-Piette, Ch.P. Blanc& D. Vukadinovic, 1974
Gulella andriantanteliae K.C. Emberton, 2010
Parvedentulina andriantanteliae K.C. Emberton, 2010
Parvedentulina andringitrae K.C. Emberton, 2002
Tayloria angustistriata L. Pfeiffer
Haploptychius anhduongae Thach, 2017