Gregariella petagnae simplicifilis K.H. Barnard, 1964
Lithophaga petricolides (FOSSIL) †
Lithophaga petricoloides (FOSSIL) †
Brachidontes pharaonis (P. Fischer, 1870)
Modiolula phaseolina (R.A. Philippi, 1844)
Musculus phenax W.H. Dall, 1915
Modiolus philippinarum S.C.T. Hanley, 1844
Lithophaga phosphaticus (FOSSIL) Keeping †
Modiolus pictinatus (FOSSIL) J.B.P.A. Lamarck, 1805 †
Musculus pihetei (FOSSIL) G.P. Deshayes, 1858 †
Vilasina pillula P. Bartsch in O.A. Scarlato,1960
Botula pirriei (FOSSIL) J.D. Stilwell& Zinsmeister, 1992 †
Mytilus planulatus J.B.P.A. Lamarck, 1819
Bathymodiolus platifrons J. Hashimoto & T.A. Okutani,1994
Brachidontes playasensis (H.A. Pilsbry& A.A. Olsson, 1935)
Mytilus pleshakovi (FOSSIL) Simonova, 1941 †
Modiolatus plicatus (J.F. Gmelin, 1791)
Pharomytilus plicatus (FOSSIL) (Sowerby, 1819 †)
Inoperna plicatus (FOSSIL) T.A. Conrad 1873 †
Modiolus plumescens (R.W. Dunker, 1868)
Lithophaga plumula (S.C.T. Hanley, 1843)
Mytilus podkagernensis (FOSSIL) Slodkewitsch & Ilyina,1935 †
Amygdalum politum (A.E. Verrill& S. Smith in A.E. Verrill, 1880)
Crenella porterensis (FOSSIL) C.S. Weaver, 1916 †
Modiolus porterensis (FOSSIL) (Clark †)
Lithophaga portlandicus (FOSSIL) Damon, 1860 †
Modiolus potomacensis (FOSSIL) Clark, 1895 †
Promytilus pottsvillensis (FOSSIL) Hoare & al., 1978 †
Musculus praeniger (FOSSIL) V.N. Sinelnikova, 1990 †
Modiolus praerupta (FOSSIL) G.B. Pritchard, 1901 †
Rhomboidella prideaux (W.E. Leach, 1815)
Rhomboidella prideauxi (W.E. Leach, 1815)
Eyrena primulafontensis (FOSSIL) (Etheridge, 1902 †)
Promytilus priscus (FOSSIL) Newell, 1942 †
Septifer proboulus (FOSSIL) D.T. Dockery, 1982 †