Dallocardia muricata (C. Linnaeus, 1758) Cuba49 mm
Fulvia mutica (L.A. Reeve, 1844) Japan, Tosa74 mm
Ciliatocardium mutuense (FOSSIL) (S. Nomura& K.M. Hatai, 1936 †)
Cardium nanum (FOSSIL) Khomenko, 1931 † Russia, Sakhalin
Discors naricum (FOSSIL) E.W. Vredenburg, 1928 † Pakistan, Sind, Mirpur Khas
Fulvia natalensis (C.F.F. von Krauss, 1848) South Africa19,5 mm
Laevicardium nemo E. Fischer-Piette, 1977
Laevicardium nemocardiforme (FOSSIL) A.I. Kafanov & Savizky,1983 † Russia, Sachalin
Vasticardium neokenyanum Hylleberg, 2015
Pseudocatillus nevesskayae (FOSSIL) D. Esu & A.M. Popov,2012 † Italy, Marche
Protocardia newberryana (FOSSIL) W.M. Gabb, 1881 †
Vasticardium ngai Thach, 2016
Nemocardium nicoletti (FOSSIL) † USA, Louisiana, Caldwell
Nemocardium nicolletti (FOSSIL) (T.A. Conrad, 1862 †) USA, Alabama, Choctaw
Fulvia nienkeae J.J. Ter Poorten, 2012 New Caledonia, Grand Passage33,2 mm
Granocardium nipponense (FOSSIL) Tashiro, 1976 † Japan, Amakusa-Shimoshima28 mm
Fragum nivale L.A. Reeve, 1845 Red Sea42,8 mm
Nemocardium nodaense (FOSSIL) L. Krishtofovich, 1947 † Russia, Sakhalin
Cardium nodosulum (FOSSIL) Wood, 1840 † UK, England, Norfolk
Cardium nodosum Montague, 1803
Europicardium nolfi F. Swinnen, 2010 Angola
Trifaricardium nomurai J.T. Kuroda & T. Habe,1951 Philippines, Balicasag Island23,8 mm
Yagudinella notabile (FOSSIL) (N.P. Mohr, 1786 †)
Serripes notabilis Sowerby, 1915 Japan, Oumu
Cardium nuculoides (FOSSIL) Stoppani, 1861 †
Clinocardium nuttallii (T.A. Conrad, 1837) Alaska, Wrangell Island83,5 mm
Parvicardium nystianum (FOSSIL) (A.V.M.D. D'Orbigny,1852 †) Belgium, Vlaanderen, Limburg
Cardium obliquum (FOSSIL) J.B.P.A. Lamarck, 1805 † France, Picardie, Oise
Laevicardium oblongum (J.F. Gmelin, 1791) Spain65 mm
Apiocardia obovale (Sowerby, 1833) Panama13 mm
Ciliatocardium obstinatus (FOSSIL) K.B. Barinov, 1992 † Russia, Kamchatka, Karaginskiy
Serripes ochotensis (FOSSIL) Ilyina, 1963 † Western Kamchatka
Discors ogormani (FOSSIL) A.E.M. Cossmann, 1923 † France, Aquitaine27 mm
Hedecardium ogurai (FOSSIL) (Y. Otuka, 1938 †) Japan, Hiroshima
Acrosterigma okinawaensis (J.T. Kuroda, 1960) Okinawa74 mm