Amygdalum pallidulum (W.H. Dall, 1916)
Choromytilus palliopunctatus (P.P. Carpenter, 1857)
Lithophaga palmerae (FOSSIL) D.K. Krumm & D.S. Jones,1993 †
Dacrydium panamense J. Knudsen, 1970
Musculus panhai R.G. Moolenbeek, 2009
Modiolus pantanellii (FOSSIL) Futterer, 1897 †
Lithophaga papyracea (FOSSIL) G.P. Deshayes, 1824 †
Arcuatula papyria (T.A. Conrad, 1846)
Lithophaga paraplumula (K.H. Kleemann& P. Maestrati, 2012)
Lithophaga parapurpurea (K.H. Kleemann, 2008)
Modiolus paronai (FOSSIL) Bittner, 1895 †
Musculus partumetum unknown
Leiosolenus patagonicus (A.V.M.D. D'Orbigny,1842)
Modiolus patagonicus (A.V.M.D. D'Orbigny,1842)
Amygdalum peasei (W. Newcomb, 1870)
Modiolus pectinata (FOSSIL) J.B.P.A. Lamarck †
Mytilus pectinatus (FOSSIL) Sowerby, 1821 †
Arvella pectinula (A.A. Gould, 1841)
Adipicola pelagica (E. Forbes in S. Woodward,1854)
Crenella pellucida (J.G. Jeffreys, 1859)
Dacrydium pelseneeri C. Hedley, 1906
Modiolus penetectus (J.C. Verco, 1907)
Arcuatula perfragilis (R.W. Dunker, 1857)
Mytilus periscus (FOSSIL) Cox, 1936 †
Lithophaga permianus (FOSSIL) Frebold, 1933 †
Perna perna (C. Linnaeus, 1758)
Perna perna picta (I. von Born, 1780)
Modiolus peronianus C.F. Laseron, 1956
Inoperna perplicata (FOSSIL) (Etallon, 1863 †)
Modiolus perrarus (FOSSIL) Kalishevich, 1981 †
Modiolus perryi (FOSSIL) Kirkland, 1996 †
Solamen persicum (J.F. Gmelin, 1791)
Rhomboidella perstriata (C. Hedley, 1906)
Lithophaga peruviana (A.V.M.D. D'Orbigny,1846)
Gregariella petagnae (A. Scacchi, 1832)