Spisula crassitesta (FOSSIL) (Finlay, 1927 †)
Zenatia cretacea (FOSSIL) (Woods, 1917 †)
Mactra crossei (R.W. Dunker, 1877)
Mactra cumingii L.A. Reeve, 1854
Mactra cuneata J.F. Gmelin, 1791
Rangia cuneata Sowerby, 1831
Lutraria curta L.A. Reeve, 1854
Leptomactra curtidens (FOSSIL) (W.H. Dall, 1898 †)
Mactra cygnus J.F. Gmelin, 1791
Ovamactra cyma (FOSSIL) W.P. Woodring, 1982 †
Anatina cyprinus (W. Wood, 1828)
Eopapyrina darienensis (FOSSIL) (W.H. Dall, 1898 †)
Mactra darwinii (FOSSIL) Sowerby, 1846 †
Spisula decisa (FOSSIL) †
Leptomactra delumbis (FOSSIL) (T.A. Conrad, 1832 †)
Spisula densa (FOSSIL) W.H. Dall, 1898 †
Pseudocardium densatum (FOSSIL) (T.A. Conrad, 1856 †)
Mactrotoma depressa (L. Spengler, 1802)
Barymactra dernburgi (FOSSIL) Bohm & Weisfermel, 1913 †
Oxyperas deserta (FOSSIL) A.A. Olsson, 1928 †
Mactra deshayesi L.A. Reeve, 1854
Spisula discors (J.E. Gray, 1837)
Mactra dissimilis L.A. Reeve, 1845
Spisula dodona (FOSSIL) W.H. Dall, 1898 †
Mactrinula dolabrata (L.A. Reeve, 1854)
Simomactra dolabriformis (T.A. Conrad, 1867)
Mactra ducomi (FOSSIL) A.E.M. Cossmann& M.A. Peyrot, 1909 †
Mactra eburnea R.A. Philippi, 1849
Mulinia edulis (King, 1831)
Oxyperas egena (L.A. Reeve, 1854)
Harvella elegans (Sowerby, 1825)
Mactrellona elisia (FOSSIL) (W.H. Dall, 1915 †)
Spisula elliptica (J. Brown, 1827)
Oxyperas elongata (J.R.C. Quoy& J.P. Gaimard, 1835)
Resania elongata (FOSSIL) A.G. Beu, 1966 †