Legumen planulatum (FOSSIL) (T.A. Conrad, 1853 †)
Comus platyaulax (J.R. le B. Tomlin, 1924)
Gouldia platycostata (FOSSIL) Miller III, 1985 †
Tapes platyptycha H.A. Pilsbry, 1901
Mercenaria plena (FOSSIL) T.A. Conrad, 1869 †
Macrocallista pleshakovi (FOSSIL) V.N. Sinelnikova, 1991 †
Circe plicatina (J.B.P.A. Lamarck, 1818)
Katherinella plummeri (FOSSIL) Garvie, 2013 †
Tivela polita (G.B. II Sowerby, 1851)
Lioconcha polita (P.F. Röding, 1798)
Meroena polita (FOSSIL) (J.B.P.A. Lamarck,1806 †)
Paphia polita (G.B. II Sowerby, 1852)
Callista politissima J.T. Kuroda, 1945
Hyphantosoma pollicaris (P.P. Carpenter, 1864)
Pelecyora polytropa (FOSSIL) (Anderson, 1958 †)
Pelecyora polytropa nysti (FOSSIL) (Orbigny, 1852) †
Pelecyora polytropa suborbicularis (FOSSIL) (G.A. Goldfuss, 1841) †
Dosinia ponderosa Gray, 1838
Tivela ponderosa (F.C.L. Kochin R.A. Philippi, 1844)
Kyrina ponsonbyi (G.B. III Sowerby, 1892)
Pitar porrecta (FOSSIL) A. von Koenen, 1894 †
Chionopsis posorensis (FOSSIL) Olsson 1931 †
Chionopsis posorjensis (FOSSIL) (A.A. Olsson, 1931 †)
Pitar potteri J.M. Healy & K.L. Lamprell,1992
Dosinia powelli (FOSSIL) J. Marwick, 1948 †
Katelysia praecursor (FOSSIL) N.H. Ludbrook, 1978 †
Pitar praenominatus (FOSSIL) (G.D. Hanna †)
Pitar pratti (FOSSIL) (d'Archiac & Haime,1853 †)
Claudiconcha prava (FOSSIL) Kilburn & Takard 1975 †
Gouldia primaeva (FOSSIL) L. Waagen, 1881 †
Marama pristina (FOSSIL) J. Marwick, 1927 †
Mercenaria prodroma (FOSSIL) Gardner, 1947 †
Cyclinella producta (P.P. Carpenter, 1856)
Cryptonemella producta (J.T. Kuroda & T. Habe,1951)
Chione propingua (FOSSIL) (J.E. Tenison-Woods,1877 †)