Tropidomya abbreviata (E. Forbes, 1843)
Rhinoclama abrupta (J.A. Allen & R.E. Morgan,1981)
Cardiomya abyssicola A.E. Verrill & K.J. Bush,1898
Cuspidaria abyssopacifica T.A. Okutani, 1975
Myonera acutecarinata (P. Dautzenberg& H. Fischer, 1906)
Rhinoclama adamsi (R.E. Morgan & D. Heppell,1981)
Cuspidaria adelaidensis (FOSSIL) R. Tate, 1887 †
Leiomya adunca (A.A. Gould, 1861)
Cuspidaria alaeformis (FOSSIL) Shumard †
Cardiomya alcocki (E.A. Smith, 1894)
Myonera alleni J. Poutiers & F.R. Bernard,1995
Rhinoclama alta (J.C. Verco, 1908)
Cuspidaria altenai J. Knudsen, 2005
Cardiomya alternata (A.V.M.D. D'Orbigny,1853)
Cardiomya alveata (C. Hedley, 1907)
Cardiomya anaticepsella (FOSSIL) C.J.S. Hickman, 2014 †
Cardiomya andamanica H.B. Preston, 1916
Cuspidaria angasi (E.A. Smith, 1885)
Myonera angularis (J.G. Jeffreys, 1876)
Cardiomya angusticauda O.A. Scarlato, 1972
Cuspidaria annandalei H.B. Preston, 1915
Cuspidaria apodema W.H. Dall, 1916
Cuspidaria approximata E.A. Smith, 1896
Cuspidaria arcoida T.A. Okutani & R. Kawamura,2002
Cuspidaria arctica (G.O. Sars, 1859)
Cuspidaria arcuata (W.H. Dall, 1881)
Cuspidaria ascoldica O.A. Scarlato, 1972
Myonera atlantica J.A. Allen & R.E. Morgan,1981
Cuspidaria attenuata (FOSSIL) †
Rhinoclama aupouria (R.K. Dell, 1950)
Cuspidaria azorica (E.A. Smith, 1885)
Cardiomya balboae W.H. Dall, 1916
Cuspidaria barnardi J. Knudsen, 1970
Cardiomya behringensis (W. Leche, 1883)
Cuspidaria beneansata (FOSSIL) J. Marwick, 1931 †