Alvania angioyi J.J. Van Aartsen, 1982
Alvania angularis A. Warén, 1996
Mohrensternia angulata (FOSSIL) (K.E.I. von Eichwald,1830 †)
Haurakia angulata (C. Hedley, 1907)
Rissoa angulatacuta (FOSSIL) (F. Sacco, 1895 †)
Porosalvania angulifera S. Gofas, 2007
Rissoa angustior (T.A. de M. Monterosato,1917)
Crisilla angustostriata J. van der Linden, 2005
Alvania annobonensis E. Rolán, 2004
Lironoba anomala A.W.B. Powell, 1940
Setia anselmoi (J.J. Van Aartsen& W. Engl, 1999)
Benthonellania antepelagica (FOSSIL) P. Lozouet, 1990 †
Powellisetia antipoda (A.W.B. Powell, 1955)
Setia antipolitana (J. van der Linden& W.M. Wagner, 1987)
Onoba antleri Güller & Zelaya, 2017
Alvania antwerpiensis (FOSSIL) M. Glibert, 1952 †
Pusillina aquensis P. Lozouet, 2015
Manzonia arata S. Gofas, 2007
Attenuata archensis (W.L. May, 1913)
Alvania areolifera (FOSSIL) (C.L.F. von Sandberger,1860 †)
Crepitacella aresca (FOSSIL) W.P. Woodring, 1928 †
Alvania argentea (G.B. III Sowerby, 1892)
Alvania argillensis (FOSSIL) P. Lozouet, 1998 †
Alvania arguta É.A.A. Locard & E. Caziot,1900
Powellisetia arnaudi W.F. Ponder, 1983
Alvania arubensis D. De Jong & H.E. Coomans,1988
Alvania aspera (R.A. Philippi, 1844)
Alvania asphaltodus (FOSSIL) C. Beets, 1942 †
Cingula asser P. Bartsch, 1910
Plagyostila asturiana P. Fischer in L. de Folin,1872
Frigidoalvania asura (M. Yokoyama, 1926)
Lucidestea atkinsoni (J.E. Tenison-Woods,1876)
Gofasia atlantidis S. Gofas, 2007
Cingula atomaria A.A. Gould, 1860
Rissoa atomus E.A. Smith, 1890