Helicina abbotti E.G. Vanatta, 1920
Blandia abbottiana E. Chitty, 1857
Helicina acobambensis H.A. Pilsbry, 1945
Ustronia acuminata (G.T. Velazquez in F. Poey,1852)
Geophorus acutissimus (G.B. Sowerby, 1842)
Geophorus acutus (L. Pfeiffer, 1848)
Stoastomops adamsi H.B. Baker, 1934
Blandia adamsiana E. Chitty, 1857
Lucidella adamsiana (L. Pfeiffer, 1848)
Helicina adspersa L. Pfeiffer, 1839
Alcadia affinis (C.B. Adams, 1846)
Blandia agassiziana (C.B. Adams, 1851)
Geophorus agglutinans (G.B. Sowerby, 1842)
Geophorus agglutinans albocarinata (O.F. von Möllendorff,1891)
Geophorus agglutinans negrosensis P. Bartsch, 1918
Geophorus agglutinans romblonensis P. Bartsch, 1918
Geophorus agglutinans siquijorensis P. Bartsch, 1918
Geophorus agglutinans tagbilleranus P. Bartsch, 1918
Schasicheila alata (L. Pfeiffer, 1849)
Fadyenia albersiana E. Chitty, 1857
Semitrochatella alboviridis (B.H. Wrightin L. Pfeiffer, 1864)
Fadyenia alderiana (E. Chitty, 1857)
Orobophana alrici (J.C.H. Crosse, 1894)
Alcadia alta (G.B. Sowerby, 1866)
Sulfurina amaliae (W. Kobelt, 1886)
Oxyrhombus amoena (L. Pfeiffer, 1849)
Helicina ampliata (FOSSIL) Arkell, 1933 †
Helicina ampliata C.B. Adams, 1850
Helicina anaaensis A. Mousson, 1869
Pleuropoma andamanica (W.H. Benson)
Helicina angulata G.B. Sowerby, 1873
Helicina angulifera A.J. Wagner, 1910
Fadyenia anthoniana (C.B. Adams, 1851)
Helicina antillarum G.B. Sowerby, 1842
Helicina antoni L. Pfeiffer, 1849