Pachymelon amoriaformis (FOSSIL) (J. Marwick, 1926 †)
Melo amphora (J. Lightfoot, 1786)
Neoathleta amphora (FOSSIL) L.M.D. Bellardi 1890 †
Alcithoe amundseni (FOSSIL) J.D. Stilwell& Zinsmeister, 1992 †
Lyria anceps (FOSSIL) O.G. Michelotti, 1861 †
Adelomelon ancilla (J. Lightfoot, 1786)
Adelomelon ancilla barattinii M.A. Klappenbach& E.H. Ureta, 1966
Adelomelon ancilla martensi (H. Strebel, 1906)
Ericusa ancilloides (FOSSIL) R. Tate, 1889 †
Palaeomelon angoli (FOSSIL) C. Nielsen& D. Frassinetti, 2007 †
Eosephaea angusta (FOSSIL) (G.P. Deshayes, 1835 †)
Lyria anna (R.P. Lesson, 1835)
Notopeplum annulatum B.R. Wilson, 1972
Fusivoluta anomala (E.C. Von Martens, 1902)
Falsilyria anoptos (FOSSIL) R.C. Hoerle, 1978 †
Lyria antarctica (FOSSIL) J.D. Stilwell& Zinsmeister, 1992 †
Athleta anticingulata (FOSSIL) (F. McCoy, 1866 †)
Athleta anticingulata persulcata (G.B. Pritchard, 1913)
Ternivoluta antiscalaris (FOSSIL) (F. McCoy, 1866 †)
Zygomelon apheles (FOSSIL) J.D. Stilwell & al.,2004 †
Callipara aphrodite (I.P. Bondarev, 1999)
Alcithoe arabica (J.F. Gmelin, 1791)
Alcithoe arabica depressa H.H. Suter, 1908
Alcithoe arabica swainsoni J. Marwick, 1926
Alcithoe arabica swainsoni motutaraensis A.W.B. Powell, 1928
Alcithoe arabicula (FOSSIL) J. Marwick, 1926 †
Athleta arangia (FOSSIL) K.V.W. Palmer, 1953 †
Harpulina arausiaca (J. Lightfoot, 1786)
Harpulina arausiaca vexillum (J.F. Gmelin, 1791)
Volutifusus asheri (FOSSIL) E.J. Petuch, 1988 †
Scaphella ashleyae (FOSSIL) E.J. Petuch, 1994 †
Melo ashmorensis H. Morrison, 2005
Volutospina athleta (FOSSIL) (D.C. Solanderin G. Brander, 1877 †)
Ericusa atkinsoni (FOSSIL) (G.B. Pritchard, 1896 †)
Scaphella atlantis W.J. Clench, 1946