Dallocardia muricata (C. Linnaeus, 1758)
Fulvia mutica (L.A. Reeve, 1844)
Ciliatocardium mutuense (FOSSIL) (S. Nomura & K.M. Hatai,1936 †)
Cardium nanum (FOSSIL) Khomenko, 1931 †
Discors naricum (FOSSIL) E.W. Vredenburg, 1928 †
Fulvia natalensis (C.F.F. von Krauss, 1848)
Laevicardium nemo E. Fischer-Piette, 1977
Laevicardium nemocardiforme (FOSSIL) A.I. Kafanov & Savizky,1983 †
Vasticardium neokenyanum Hylleberg, 2015
Pseudocatillus nevesskayae (FOSSIL) D. Esu & A.M. Popov,2012 †
Protocardia newberryana (FOSSIL) W.M. Gabb, 1881 †
Vasticardium ngai Thach, 2016
Nemocardium nicoletti (FOSSIL) †
Nemocardium nicolletti (FOSSIL) (T.A. Conrad, 1862 †)
Fulvia nienkeae J.J. Ter Poorten, 2012
Granocardium nipponense (FOSSIL) Tashiro, 1976 †
Fragum nivale L.A. Reeve, 1845
Nemocardium nodaense (FOSSIL) L. Krishtofovich, 1947 †
Cardium nodosulum (FOSSIL) Wood, 1840 †
Cardium nodosum Montague, 1803
Europicardium nolfi F. Swinnen, 2010
Trifaricardium nomurai J.T. Kuroda & T. Habe,1951
Yagudinella notabile (FOSSIL) (N.P. Mohr, 1786 †)
Serripes notabilis Sowerby, 1915
Cardium nuculoides (FOSSIL) Stoppani, 1861 †
Clinocardium nuttallii (T.A. Conrad, 1837)
Parvicardium nystianum (FOSSIL) (A.V.M.D. D'Orbigny,1852 †)
Cardium obliquum (FOSSIL) J.B.P.A. Lamarck, 1805 †
Laevicardium oblongum (J.F. Gmelin, 1791)
Apiocardia obovale (Sowerby, 1833)
Ciliatocardium obstinatus (FOSSIL) K.B. Barinov, 1992 †
Serripes ochotensis (FOSSIL) Ilyina, 1963 †
Discors ogormani (FOSSIL) A.E.M. Cossmann, 1923 †
Hedecardium ogurai (FOSSIL) (Y. Otuka, 1938 †)
Acrosterigma okinawaensis (J.T. Kuroda, 1960)