Pisidium orientale (L.A. Prozorova, 1995)
Pisidium ovampicum C.M.F. Ancey, 1890
Eupera ovata (G. Mandahl-Barth, 1954)
Pisidium ovatotrigonum (L.V. Krivosheina, 1979)
Pisidium paludosum F.W. Hutton, 1849
Odhneripisidium pamirense Z.I. Izzatullaev& Y.I. Starobogatov, 1986
Byssanodonta paranensis D'Orbigny, 1846
Pisidium parenzani L. Gambetta, 1930
Sphaerium partumeium T. Say, 1822
Eupera parvula (T. Prime, 1865)
Pisidium parvum A. Mori, 1938
Pisidium patagonicum (H.A. Pilsbry, 1911)
Sphaerium patella A.A. Gould, 1850
Pisidium peipsi (V.J. Timm, 1976)
Pisidium personatum A.W. Malm, 1855
Pisidium pipoense C.F. Ituarte, 2000
Pisidium pirogovi (Y.I. Starobogatov, 1984)
Pisidium pirothi C.F. Jickeli, 1881
Eupera pittieri E.C. Von Martens, 1900
Eupera platensis M. Doello-Jurado, 1921
Pisidium platyvalva Z.V. Slugina& Y.I. Starobogatov, 1994
Pisidium plenilunium (J.C. Melvill & R. Standen,1907)
Pisidium ponderi A. Korniushin, 2000
Pisidium popovae Y.I. Starobogatov& E.A. Streletzkaja, 1967
Eupera portoricensis (T. Prime, 1861)
Pisidium prasongi J.G.J. Kuiper, 1974
Eupera primei M.A. Klappenbach, 1967
Sphaerium problematicum C.J. Gabriel, 1939
Sphaerium prominulum (FOSSIL) (A.E. Reuss in A.E. Reuss& Meyer, 1849 †)
Pisidium pseudosphaerium J. Favre, 1927
Pisidium pulchellum L. Jenyns, 1831
Pisidium punctiferum R.J.L. Guppy, 1867
Pisidium pusillum (Turton, 1819)
Sphaerium quirindi A. Korniushin, 2000
Pisidium raddei (W. Dybowski, 1902)