Helicina abbotti E.G. Vanatta, 1920 Haiti
Blandia abbottiana E. Chitty, 1857 Jamaica
Helicina acobambensis H.A. Pilsbry, 1945
Ustronia acuminata (G.T. Velazquez in F. Poey, 1852) Cuba15 mm
Geophorus acutissimus (G.B. Sowerby, 1842) Philippines, Cebu15 mm
Geophorus acutus (L. Pfeiffer, 1848)
Stoastomops adamsi H.B. Baker, 1934 Jamaica
Blandia adamsiana E. Chitty, 1857 Jamaica
Lucidella adamsiana (L. Pfeiffer, 1848) Jamaica
Helicina adspersa L. Pfeiffer, 1839 Cuba18 mm
Alcadia affinis (C.B. Adams, 1846) Jamaica
Blandia agassiziana (C.B. Adams, 1851) Jamaica
Geophorus agglutinans (G.B. Sowerby, 1842) Malaysia, Borneo11,4 mm
Geophorus agglutinans albocarinata (O.F. von Möllendorff,1891) Philippines, Aliguay Island15,1 mm
Geophorus agglutinans negrosensis P. Bartsch, 1918 Philippines, Cebu13,5 mm
Geophorus agglutinans romblonensis P. Bartsch, 1918 Philippines, Romblon Island13,9 mm
Geophorus agglutinans siquijorensis P. Bartsch, 1918 Philippines, Siquijor11,4 mm
Geophorus agglutinans tagbilleranus P. Bartsch, 1918 Philippines, Bohol17,6 mm
Schasicheila alata (L. Pfeiffer, 1849) Veracruz, Mexico
Fadyenia albersiana E. Chitty, 1857 Jamaica
Semitrochatella alboviridis (B.H. Wright in L. Pfeiffer, 1864) Cuba
Fadyenia alderiana (E. Chitty, 1857) Jamaica
Orobophana alrici (J.C.H. Crosse, 1894) New Caledonia5 mm
Alcadia alta (G.B. Sowerby, 1866) Puerto Rico5,3 mm
Sulfurina amaliae (W. Kobelt, 1886) Philippines8 mm
Oxyrhombus amoena (L. Pfeiffer, 1849) Nicaragua
Helicina ampliata (FOSSIL) Arkell, 1933 † UK, England, North Yorkshire
Helicina ampliata C.B. Adams, 1850 Jamaica
Helicina anaaensis A. Mousson, 1869 French Polinesia, Gambier Archipelago
Pleuropoma andamanica (W.H. Benson) India, Cuddalore
Helicina angulata G.B. Sowerby, 1873 Brazil, Espirito Santo9 mm
Helicina angulifera A.J. Wagner, 1910 Brazil14,5 mm
Fadyenia anthoniana (C.B. Adams, 1851) Jamaica
Helicina antillarum G.B. Sowerby, 1842 Guadeloupe9,1 mm
Helicina antoni L. Pfeiffer, 1849 Hawaii