Mactra grandis J.F. Gmelin, 1791
Mactra grandis mera G.P. Deshayes, 1854
Heteromactra grateloupi (FOSSIL) A.E.M. Cossmann& M.A. Peyrot, 1909 †
Anatina grayi M. Huber, 2015
Mactra guidoi J.H. Signorelli& F. Scarabino, 2010
Pseudocardium haboroensis (FOSSIL) M. Yokoyama, 1927 †
Mactra hamiltonensis (FOSSIL) R. Tate, 1887 †
Spisula hannibali (FOSSIL) Clark & R. Arnold, 1923 †
Hemimactra harrisi (FOSSIL) A.A. Olsson, 1914 †
Mactromeris hemphillii (W.H. Dall, 1894)
Cymbophora hetonaiensis (FOSSIL) T. Nagao & Otatume,1938 †
Mactra hians R.A. Philippi, 1846
Electromactra howchiniana (FOSSIL) (R. Tate, 1887 †)
Spisula hualtaca (FOSSIL) A.A. Olsson, 1928 †
Mactra hybrida (FOSSIL) Dufour, 1881 †
Trinitasia iheringi (W.H. Dall, 1897)
Lutraria impar L.A. Reeve, 1854
Mactra inaequalis L.A. Reeve, 1854
Spisula inaequilatera (FOSSIL) (P. Nyst, 1845 †)
Spisula inaequilateralis (FOSSIL) (Meyer, 1886 †)
Mactra inaequipartita (FOSSIL) A.E.M. Cossmann& M.A. Peyrot, 1909 †
Mactra incarnata L.A. Reeve, 1854
Mactra incerta E.A. Smith, 1885
Anatina inconstans (R. von Cosel, 1995)
Lutraria inhacaensis (P.H. Boshoff, 1965)
Mactra iridescens J.T. Kuroda& T. Habe in T. Habe, 1958
Mactra irizari (FOSSIL) R.O. Wilckens, 1912 †
Mactra isabelleana D'Orbigny, 1846
Mactrotoma isthmica (H.A. Pilsbry & H.N. Lowe,1932)
Mactrotoma isthmica fonsecana L.G. Hertlein & A.M. Strong,1950
Coelomactra iwatensis (FOSSIL) (Hatai 1940) †
Mactra jacksonensis E.A. Smith, 1885
Spisula jacksonensis (FOSSIL) †
Mactrella janeiroensis (FOSSIL) (E.A. Smith, 1915 †)
Nymphactra jonasseni (FOSSIL) J.D. Stilwell& Zinsmeister, 1992 †