Physa jennessi (W.H. Dall, 1919)
Physella johnsoni (W.J. Clench, 1926)
Physa kanakina J. Gassies, 1857
Physa khabarovskiensis Y.I. Starobogatov, 1992
Physa kuvaevi Y.I. Starobogatov, 1992
Physa lactaena (FOSSIL) H.D. Russell, 1935 †
Haitia lacustris (S. Clessin, 1886)
Mexinauta laetus (E.C. Von Martens, 1898)
Archiphysa laphami (F.C. Baker, 1928)
Archiphysa latchfordii (F.C. Baker, 1928)
Physa loosi E.L. Holmberg, 1909
Archiphysa lordi (W. Baird, 1863)
Physa magnalacustris B. Walker, 1901
Aplexa marmorata L. Guilding, 1828
Mayabina martinidella (F.P. Jousseaume, 1887)
Stenophysa maugeriae (J.E. Gray, 1837)
Physa megalochlamys D.W. Taylor, 1988
Physa meigsii (FOSSIL) W.H. Dall, 1890 †
Physa meneghinii (FOSSIL) F. Sacco, 1886 †
Haitia mexicana (R.A. Philippi, 1841)
Haitia mexicana humerosa (A.A. Gould, 1855)
Haitia mexicana tolucensis (J.C.H. Crosse& P.H. Fischer, 1878)
Physa microstriata J.L. Chamberlin& S.S. Berry, 1930
Physa mirollii D.W. Taylor, 2003
Physa moluccensis R.P. Lesson, 1831
Haitia moreleti D.W. Taylor, 2003
Aplexa moskvichevae Y.I. Starobogatov, 1992
Physa natricina (D.W. Taylor, 1988)
Mexinauta nicaraguanus (P.M.A. Morelet, 1851)
Mexinauta nitens (R.A. Philippi, 1841)
Mexinauta nitens acutalis (J.C.H. Crosse& P.H. Fischer, 1886)
Mayabina nitidula (S. Clessin, 1886)
Physa nodulosa W.A. Biese, 1948
Physella nuttallii (I. Lea, 1864)
Mayabina obtusa (S. Clessin, 1885)