Indocrassatella oblongata (M. Yokoyama, 1920)
Indocrassatella oblongata uchidana (FOSSIL) (M. Yokoyama, 1926 †)
Crassatella ogormani (FOSSIL) A.E.M. Cossmann †
Chattina omanensis (E.A. Smith, 1906)
Crassatina ornata (J.E. Gray in E. Griffith& E. Pidgeon, 1833)
Nipponocrassatella osawanoensis (FOSSIL) (Tsuda 1959) †
Crassatella oversa (FOSSIL) Wood †
Crassinella pacifica (C.B. Adams, 1852)
Crassinella pacifica mexicana H.A. Pilsbry & H.N. Lowe,1932
Crassatina paeteli (H. von Maltzan, 1885)
Crassatella pallida A. Adams & L.A. Reeve,1850
Crassatella paramesus (FOSSIL) W.H. Dall, 1916 †
Crassatella parisiensis (FOSSIL) A.V.M.D. D'Orbigny,1850 †
Crassatella patagonica (FOSSIL) H.F.A. von Ihering,1907 †
Crassatina pauxillus (FOSSIL) (M. Yokoyama, 1925 †)
Crassatella pedroi (FOSSIL) DeVries, 2016 †
Chattonia penjica (FOSSIL) V.N. Sinelnikova, 1997 †
Scambula perplana (FOSSIL) T.A. Conrad, 1869 †
Cypricardella petschorica (FOSSIL) Guskov, 1984 †
Hybolophus picaderus (FOSSIL) (A.A. Olsson, 1964 †)
Chattina picta (A. Adams & L.A. Reeve,1850)
Indocrassatella pilula (K.H. Barnard, 1964)
Crassatella pizarroi (FOSSIL) G.D. Hanna & Israelsky,1925 †
Crassatella plumbea (FOSSIL) (J.H. Chemnitz, 1824 †)
Crassatella ponderosa (FOSSIL) (J.F. Gmelin, 1791 †)
Tilicrassatella ponderosa (FOSSIL) (R.A. Philippi, 1887 †)
Spissatella poroleda (FOSSIL) Finlay, 1926 †
Crassatella portelli (FOSSIL) DeVries, 2016 †
Bathytormus praecuratus (FOSSIL) (A.E.M. Cossmann, 1892 †)
Salaputium probleemum (J.C. Verco, 1907)
Salaputium productum (J.C. Verco, 1895)
Bathytormus protextus (FOSSIL) (T.A. Conrad, 1832 †)
Crassatella pseudolamellosa (FOSSIL) Berezovsky, 2017 †
Bathytormus pteropsis (FOSSIL) (T.A. Conrad, 1860 †)
Crassatina puellula (FOSSIL) (Mayer-Eymar 1898) †