Tropidomya abbreviata (E. Forbes, 1843) Strait of Gibraltar9 mm
Rhinoclama abrupta (J.A. Allen& R.E. Morgan, 1981)
Cardiomya abyssicola A.E. Verrill & K.J. Bush,1898 Maryland, Chesapeake County
Cuspidaria abyssopacifica T.A. Okutani, 1975 Japan, Izu Islands
Myonera acutecarinata (P. Dautzenberg& H. Fischer, 1906)
Rhinoclama adamsi (R.E. Morgan& D. Heppell, 1981) Japan
Cuspidaria adelaidensis (FOSSIL) R. Tate, 1887 †
Leiomya adunca (A.A. Gould, 1861) Pacific
Cuspidaria alaeformis (FOSSIL) Shumard † Texas, Grayson County
Cardiomya alcocki (E.A. Smith, 1894) China, Zhejiang12 mm
Myonera alleni J. Poutiers& F.R. Bernard, 1995
Rhinoclama alta (J.C. Verco, 1908) South Australia
Cuspidaria altenai J. Knudsen, 2005
Cardiomya alternata (A.V.M.D. D'Orbigny,1853) America
Cardiomya alveata (C. Hedley, 1907) New South Wales
Cardiomya anaticepsella (FOSSIL) C.J.S. Hickman, 2014 † Oregon
Cardiomya andamanica H.B. Preston, 1916
Cuspidaria angasi (E.A. Smith, 1885) Tasmania
Myonera angularis (J.G. Jeffreys, 1876) Portugal
Cardiomya angusticauda O.A. Scarlato, 1972 Japan
Cuspidaria annandalei H.B. Preston, 1915
Cuspidaria apodema W.H. Dall, 1916 Alaska, Sitka
Cuspidaria approximata E.A. Smith, 1896 Gulf of Oman
Cuspidaria arcoida T.A. Okutani& R. Kawamura, 2002 Japan10,7 mm
Cuspidaria arctica (G.O. Sars, 1859) Norway, Kongsfjorden
Cuspidaria arcuata (W.H. Dall, 1881) Mexico, Yucatan
Cuspidaria ascoldica O.A. Scarlato, 1972 Japan
Myonera atlantica J.A. Allen & R.E. Morgan,1981 Bank Porcupine
Cuspidaria attenuata (FOSSIL) † United States, Alabama, Clarke
Rhinoclama aupouria (R.K. Dell, 1950) New Zealand
Cuspidaria azorica (E.A. Smith, 1885) Azores
Cardiomya balboae W.H. Dall, 1916 Galapagos
Cuspidaria barnardi J. Knudsen, 1970 off S. E. Africa (32"00'S, 32"41'E)
Cardiomya behringensis (W. Leche, 1883) China, Zhejiang12,6 mm
Cuspidaria beneansata (FOSSIL) J. Marwick, 1931 †