Dosinia auberti E. Fischer-Piette& D. Delmas, 1967
Megapitaria aurantiaca (Sowerby, 1831)
Polititapes aureus (J.F. Gmelin, 1791)
Polititapes aureus lucens (É.A.A. Locard, 1886)
Macrocallista aurilitoralis (FOSSIL) Cox 1952 †
Meretrix aurora J. Hornell, 1917
Kaneharaia ausiensis (FOSSIL) Ilyina, 1957 †
Tivela austeniana (FOSSIL) C.J. Maury, 1912 †
Gafrarium australe (G.B. II Sowerby, 1851)
Tawera australiana M. Huber, 2010
Gouldiopa australis (G.F. Angas, 1865)
Eumarcia austrolissa (FOSSIL) J.D. Stilwell& Zinsmeister, 1992 †
Periglypta avia (FOSSIL) (G.P. Deshayes, 1857 †)
Marcia avitensis (FOSSIL) (A.E.M. Cossmann, 1895 †)
Eumarcia awateria (FOSSIL) A.G. Beu, 1970 †
Lamelliconcha ayabaca (FOSSIL) A.A. Olsson, 1931 †
Chionopsis bainbridgensis (FOSSIL) (W.H. Dall, 1916 †)
Pitar baldryi (FOSSIL) A.A. Olsson, 1930 †
Circe banoni (FOSSIL) (R. Tournouer, 1873 †)
Gafrarium barandae (J.G. Hidalgo, 1885)
Tawera bartrumi (FOSSIL) J. Marwick, 1927 †
Dosinia bartrumi (FOSSIL) C.R. Laws, 1930 †
Chione basteroti (FOSSIL) (G.P. Deshayes, 1843 †)
Dosinia basteroti (FOSSIL) (A.E.R. Agassiz, 1845 †)
Tapes basteroti (FOSSIL) C. Mayer in R. Hoernes,1860 †
Tivelina baudoni (FOSSIL) A.E.M. Cossmann, 1886 †
Pitar baylii (FOSSIL) (L.H. Hupé, 1854 †)
Gemma beatrix riopejensis (FOSSIL) I. Richling, 2004 †
Leukoma beili A.A. Olsson, 1961
Pitar belcheri (G.B. II Sowerby, 1851)
Tapes belcheri Sowerby, 1852
Dosiniopsis bellovacina (FOSSIL) (G.P. Deshayes, 1825 †)
Dosinia benereparata (FOSSIL) C.R. Laws, 1930 †
Eumarcia benhami (FOSSIL) J. Marwick, 1927 †
Meretrix benoisti (FOSSIL) A.E.M. Cossmann& M.A. Peyrot, 1910 †