Stewartia anodonta (FOSSIL) (T. Say, 1824 †)
Stewartia anodonta intermixta (FOSSIL) A.A. Olsson & A. Harbison,1953 †
Lucinoma antarctica (R.A. Philippi, 1855)
Saxolucina antarctipleura (FOSSIL) J.D. Stilwell & al.,2004 †
Rostrilucina anterostrata R. von Cosel & P. Bouchet,2008
Cardiolucina antjamensis (FOSSIL) C. Beets, 1986 †
Neophysema aphanes D.W. Taylor & E.A. Glover,2005
Megaxinus appendiculatus (É.A.A. Locard, 1898)
Liralucina approximata (W.H. Dall, 1901)
Codakia aquensis (FOSSIL) (Holazapfel 1889) †
Lucina aquiana (FOSSIL) Clark, 1895 †
Divalinga arabica H. Dekker & J. Goud, 1994
Megaxinus arabicus E.A. Glover & D.W. Taylor,1997
Gonimyrtea araea (FOSSIL) (R. Tate, 1887 †)
Loripes araiogramma P.G. Oliver& H.C.G. Chesney, 1997
Epicodakia araneosa (FOSSIL) (R. Tate, 1887 †)
Eophysema arapaoa (FOSSIL) (C.A. Fleming, 1950 †)
Phacoides argentea L.A. Reeve, 1848
Pseudomiltha argus (FOSSIL) (Melleville, 1843 †)
Lucinoma asapheus P.G. Oliver, C.L. Rodrigues& C.M. Cunha, 2011
Myrtea asphaltica (FOSSIL) Cooke, 1919 †
Wallucina assimilis (G.F. Angas, 1867)
Fimbria astartiformis (FOSSIL) (Münster, 1841 †)
Schafhaeutlia astartiformis (FOSSIL) (Münster, 1840 †)
Lucinoma atalantae R. von Cosel, 2006
Loripes atavus (FOSSIL) L. Waagen, 1881 †
Lucinoma atlantis R.A. Mclean, 1936
Hadralucina augustana (FOSSIL) (Gardner, 1951 †)
Perampliata aulihan (FOSSIL) Stefanini, 1939 †
Lucina aurantia G.P. Deshayes, 1832
Pteromyrtea auriculata (FOSSIL) (J.A. Bartrum, 1919 †)
Loripinus aurora (D.W. Taylor & E.A. Glover,2005)
Pillucina australis E.A. Glover & D.W. Taylor,2001
Cardiolucina australopilula D.W. Taylor & E.A. Glover,1997
Gonimyrtea avia E.A. Glover & D.W. Taylor,2007