Autocoptis arcuata (C.D. Weinland& E.C. Von Martens, 1859)
Tomelasmus arcustriatus (B.H. Wright in L. Pfeiffer, 1863) Cuba
Holospira arellanoi (P. Bartsch, 1945) Mexico, Queretaro
Autocoptis argiphrix F.G. Thompson& C.J. Franz, 1976
Holospira arizonensis R.E.C. Stearns, 1890 USA, Arizona15 mm
Gongylostoma artemisiae (J. Gundlach in L. Pfeiffer, 1863) Cuba
Liocallonia arthuri C. de la Torre& P. Bartsch, 1972 Cuba
Badiofaux asinorum C. de la Torre& P. Bartsch, 1972 Cuba
Urocoptis aspera (C.B. Adams, 1849) Cuba
Tomelasmus assimilis (R. Arango, 1884) Cuba
Crycoryne astraxis F.G. Thompson, 1971 Mexico, Durango
Ptychodonta astrophorea (W.H. Dall, 1897) Hidalgo, Mexico
Torrecoptis atkinsi (C. de la Torre& W.J. Clench, 1930) Cuba13,6 mm
Ventricochis atra C. de la Torre& P. Bartsch, 1972 Cuba
Ventricochis atropurpurea (R. Arango, 1882) Cuba
Ventricochis atropurpurea encinarensis C. de la Torre& P. Bartsch, 1972 Cuba
Goniapex attenuapex F.G. Thompson, 1988 Chihuahua, Mexico
Liocallonia attenuata C. de la Torre& P. Bartsch, 1972 Cuba
Poeycoptis auberiana (A.V.M.D. D'Orbigny,1842) Cuba
Cochlodinella augustini C. de la Torre& P. Bartsch, 1972 Cuba
Holospira aurantiaca F.G. Thompson& E.L. Mihalcik, 2005 Puebla, Mexico
Oligostylus australis F.G. Thompson, 1963 El Salvador
Ventricochis ayuaensis C. de la Torre& P. Bartsch, 1972 Cuba
Tomelasmus azucarensis C. de la Torre& P. Bartsch, 1972 Cuba
Holospira bachia P. Bartsch, 1926 Mexico
Torrecoptis bacillaris (C. de la Torre, 1912) Cuba
Torrecoptis bacillaris petrophilla (H.A. Pilsbry, 1929) Cuba16 mm
Torrecoptis baculum (H.A. Pilsbry, 1903) Cuba
Brachypodella bahamensis (L. Pfeiffer, 1860) Bahamas
Coelostemma balesi H.A. Pilsbry, 1954 Mexico, Acapulco
Coelostemma balsasensis (P. Bartsch, 1926) Mexico, Acapulco
Gongylostomella banaoensis C. de la Torre& P. Bartsch, 1972 Cuba
Urocoptis baquieana E. Chitty, 1855 Jamaica
Brachypodella baracoensis C. de la Torre& P. Bartsch, 1972 Cuba
Pseudopineria barbadensis O. Kraus, 1996