Cythnia albida P.P. Carpenter, 1864
Eulima albida (P. Marshall, 1902)
Niso albida W.H. Dall, 1889
Annulobalcis albus P.Y. Dgebuadze, A.E. Fedosov& Y.I. Kantor, 2012
Melanella alertae (R.K. Dell, 1956)
Melanella alfredensis P. Bartsch, 1915
Niso alfredensis P. Bartsch, 1915
Melanella algoensis E.A. Smith, 1901
Hoplopteron alifera (K.H.J. Thiele, 1925)
Eulima almo (P. Bartsch, 1917)
Kittlistylus alter (FOSSIL) F. Haas, 1953 †
Provermicularia alternans (FOSSIL) (Böhm, 1895 †)
Melanella amabilis (J.W. Brazier, 1877)
Hemiliostraca amamiensis (T. Habe, 1961)
Eulima amanda (K.H.J. Thiele, 1925)
Eulima amblia R.B. Watson, 1883
Polygireulima amblytera (A.E. Verrill & K.J. Bush,1900)
Melanella ameliae W. Engl, 2007
Thyonicola americana E.S. Tikasingh, 1961
Melanella amnicreta (FOSSIL) McNeil, 1984 †
Melanella anachorea W.H. Dall, 1927
Menon anceps C. Hedley, 1900
Apicalia angulata A. Warén, 1981
Melanella angulata (C.B. Adams, 1861)
Pyramidelloides angulata (C.F. Jickeli, 1882)
Scalaribalcis angulata (G. Mandahl-Barth, 1949)
Eulima angulosa E. Fischer-Piette& M. Nicklés, 1946
Eulimostraca angusta (R.B. Watson, 1886)
Niso angusta (FOSSIL) G.P. Deshayes, 1862 †
Eulima angustior R.B. Newton, 1891
Crinolamia angustispira P. Bouchet & A. Warén,1986
Euthystylus angustus (FOSSIL) Münster, 1841 †
Eulima anonyma P. Bouchet & A. Warén,1986
Eulima antarctica (FOSSIL) (R.A. Philippi, 1887 †)
Melanella antarctica (H. Strebel, 1908)