Abbottella abbotti P. Bartsch, 1946 Dominican Republic6 mm
Annularisca aberrans C. de la Torre& P. Bartsch, 1941 Cuba
Chondropoma abnatum (J. Gundlach in L. Pfeiffer, 1858) Cuba
Tudora abtiana (L. Pfeiffer, 1862) Cuba
Opisthosiphon acklinsensis P. Bartsch, 1946 Bahamas
Parachondria adamsi (L. Pfeiffer) Jamaica
Abbottella adolphi (L. Pfeiffer, 1858) Dominican Republic7 mm
Abbottella adolphi peninsularis P. Bartsch, 1946 Dominican Republic7 mm
Abbottella aenea G.T. Watters, 2010 Dominican Republic
Chondrothyretes affinis C. de la Torre& P. Bartsch, 1938 Cuba27 mm
Eutudora agassizi (J.G.F. de Charpentier in L. Pfeiffer, 1852) Cuba11,4 mm
Troschelvindex agrestis (L. Pfeiffer, 1862) Cuba
Licina aguadillensis (L. Pfeiffer, 1875) Puerto Rico12 mm
Licina aguadillensis penoensis H.B. Baker, 1940 Puerto Rico12 mm
Wrightudora aguayoi (C. de la Torre& P. Bartsch, 1941) Cuba
Xenopoma aguayoi (C. de la Torre& P. Bartsch, 1941) Cuba13,27 mm
Bermudezsiphona aguilerianum (R. Arango & Y. Molina,1876) Cuba
Annularisca alata (L. Pfeiffer, 1851) Cuba13,6 mm
Annularisca alayoi (M.L. Jaume, 1984) Cuba
Chondropoma alayoi C.G. Aguayo & M.L. Jaume,1957 Cuba
Troschelvindex alayoi C.G. Aguayo & M.L. Jaume,1947 Cuba
Chondropoma alberti W.J. Clench& C.G. Aguayo, 1948 Cuba
Otopoma albicans (J.E. Gray& G.B. I Sowerby, 1839) Yemen, Socotra Island33,4 mm
Otopoma albicans balfouri (H.H. Godwin-Austen,1881) Yemen, Socotra Island45,4 mm
Colobostylus albus (G.B. Sowerby, 1843) Jamaica
Colobostylus albus fuscus (C.B. Adams, 1851) Jamaica
Chondrothyrium alcaldei M.L. Jaume& Sánchez De Fuentes, 1943 Cuba
Opisthosiphon alleni P. Bartsch, 1946 Bahamas
Tropidophora alluaudi P. Dautzenberg, 1894 Madagascar, Diego Suarez19 mm
Tropidophora alluaudi pallida P. Dautzenberg, 1894 Madagascar19,7 mm
Tropidophora alluaudi saturata P. Dautzenberg, 1894 Madagascar, Diego Suarez19,4 mm
Chondropomium alyshae G.T. Watters & G. Duffy,2010 Dominican Republic
Tropidophora ambilobeensis E. Fischer-Piette, F. Blanc& F. Salvat, 1969 Madagascar12,3 mm
Parachondria anatolensis Watters, 2016
Tropidophora anceps (E.C. Von Martens, 1878) Tanzania28 mm