Ervilia planata (FOSSIL) W.H. Dall, 1898 †
Ervilia podolica (FOSSIL) K.E.I. von Eichwald †
Abra prismatica (G. Montagu, 1808)
Ervilia producta N.H. Odhner, 1922
Semele proficua (R. Pulteney, 1799)
Abra profundorum (E.A. Smith, 1885)
Leptomya psittacus S.C.T. Hanley, 1882
Semele pulchra I, 1832
Thyellisca pulchra (C.B. Adams, 1866)
Leptomya pura (G.F. Angas, 1871)
Semele purpurascens (J.F. Gmelin, 1791)
Semele purpurascens sparsilineata W.H. Dall, 1915
Ervilia purpurea (E.A. Smith, 1906)
Abra pusilla (FOSSIL) (J.B.P.A. Lamarck,1806 †)
Semele radiata (T. Say, 1826)
Abra recluzii (FOSSIL) G.P. Deshayes, 1857 †
Semele recurvum (FOSSIL) Arkell, 1933 †
Abra reflexa (FOSSIL) (K.E.I. von Eichwald †)
Abra regularis (E.A. Smith, 1885)
Abra renieri (H.G. Bronn, 1831)
Leptomya retiaria (F.W. Hutton, 1885)
Semele rosea (G.B. I Sowerby, 1833)
Semele rosea junonia A.E. Verrill, 1870
Leptomya rostrata (H. Adams, 1868)
Semele rubropicta W.H. Dall, 1871
Semele rupicola W.H. Dall, 1915
Semele rupium (G.B. I Sowerby, 1833)
Rochefortina sandwichensis (E.A. Smith, 1885)
Semele sardonica (FOSSIL) W.H. Dall, 1890 †
Semele sayi (FOSSIL) F. Toula, 1909 †
Semele scabra (S.C.T. Hanley, 1843)
Ervilia scaliola A. Issel, 1869
Abra scarlatoi (G.M. Kamenev, 2004)
Abra scotti M. Huber, 2010
Abra segmentum (C.A. Récluz, 1843)