Zagrabica ornata (FOSSIL) Macale?, 2002 †
Stagnicola oronoensis F.C. Baker, 1904
Lymnaea ovalior T.N. Annandale & B. Prashad,1921
Lymnaea ovum (FOSSIL) A. Brongniart, 1810 †
Lymnaea pachyta (C.A. Westerlund, 1885)
Lymnaea pacifampla N.D. Kruglov& Y.I. Starobogatov, 1989
Stagnicola palustris (O.F. Müller, 1774)
Stagnicola palustris nuttalliana I. Lea, 1862
Undulotheca pancici (FOSSIL) (Š. Brusina, 1893 †)
Radix papaianopoli (FOSSIL) Macale?, 2000 †
Myxas papyracea (R. Tate, 1880)
Radix parapsilia M.V. Vinarski & P. Glöer,2009
Galba parva (I. Lea, 1841)
Lanx patelloides (I. Lea, 1856)
Radix paucispira (FOSSIL) (A. Fuchs, 1870 †)
Provalenciennesia pauli (FOSSIL) (R. Hoernes, 1875 †)
Lymnaea pavlovici (FOSSIL) Miloševic, 1981 †
Limnobulla peculiaris (B. Hubendick, 1951)
Valenciennius peltus (FOSSIL) (Š. Brusina, 1878 †)
Fossaria peninsulae (B. Walker, 1908)
Lymnaea peregrina (FOSSIL) G.P. Deshayes, 1838 †
Radix pergamenica (FOSSIL) (P. Oppenheim, 1919 †)
Lymnaea permanenta (FOSSIL) Miloševic, 1981 †
Fossaria perplexa (F.C. Baker & J. Henderson,1929)
Fossaria perpolita (W.H. Dall, 1905)
Radix persica (A. Issel, 1865)
Lymnaea pervia E.C. Von Martens, 1867
Lymnaea petersi W.H. Dall, 1905
Stagnicola petoskeyensis B. Walker, 1908
Valenciennius pflugi (FOSSIL) Özsayar, 1971 †
Radix phrygoovata (FOSSIL) (P. Oppenheim, 1919 †)
Galba phrygopalustris (FOSSIL) (P. Oppenheim, 1919 †)
Lymnaea physcus T.N. Annandale & Surya Rao,1925
Stagnicola pilsbryana (B. Walker, 1908)
Stagnicola pilsbryi H. Hemphill, 1890