Agathotoma alcippe (W.H. Dall, 1918)
Mangelia aleutica W.H. Dall, 1871
Pseudorhaphitoma alfredi (E.A. Smith, 1904)
Propebela alitakensis (W.H. Dall, 1919)
Bela alma K.H.J. Thiele, 1925
Pseudorhaphitoma alma (K.H.J. Thiele, 1925)
Antiguraleus alternatus (C.F. Laseron, 1954)
Oenopota althorpensis W.H. Dall, 1919
Mangelia althorpi W.H. Dall, 1919
Pseudorhaphitoma alticostata (G.B. III Sowerby, 1896)
Guraleus alucinans (G.B. III Sowerby, 1896)
Eucithara amabilis (G. Nevill & H. Nevill,1874)
Mangelia amatula W.H. Dall, 1919
Oenopota amiantus W.H. Dall, 1919
Neoguraleus amoenus (E.A. Smith, 1884)
Acmaturris ampla J.H. McLean & L.H. Poorman,1971
Bela ampla E.A. Smith, 1884
Guraleus amplexus (A.A. Gould, 1860)
Mangelia andamanensis H.B. Preston, 1908
Mangelia andersoni (FOSSIL) Wienrich & Janssen,2007 †
Bela anderssoni H. Strebel, 1908
Mangelia androyensis L. Bozzetti, 2009
Eucithara angela (A. Adams & G.F. Angas,1864)
Hemicythara angicostata (L.A. Reeve, 1846)
Eucithara angiostoma (W.H. Pease, 1868)
Mangelia angolensis K.H.J. Thiele, 1925
Leiocithara angulata (L.A. Reeve, 1846)
Mangelia angulicosta (FOSSIL) Scarponi & al., 2016 †
Propebela angulosa (G.O. Sars, 1878)
Pyrgocythara angulosa J.H. McLean & L.H. Poorman,1971
Agathotoma angusta (FOSSIL) (L.M.D. Bellardi, 1847 †)
Mangelia angusta (FOSSIL) (G. Jan, 1842 †)
Fusiguraleus angustatus (FOSSIL) (A.W.B. Powell, 1942 †)
Guraleus anisus (B.C. Cotton, 1947)
Bela ankae (FOSSIL) Gürs, 2001 †