Ancylastrum mooiensis B. Walker, 1912
Planorbis moquini E. Réquien, 1848
Ancylus moravicus (FOSSIL) Rzehak, 1893 †
Hebetancylus moricandi (A.V.M.D. D'Orbigny,1837)
Atopippeutis muelleri (FOSSIL) D. Kadolsky, 2015 †
Gyraulus multicingulatus (W.A. Wenz, 1919)
Gyraulus multiformis (Zeiten, 1832)
Planorbella multivolvis W. . Case, 1847
Bulinus mutandensis H.B. Preston, 1913
Ancylastrum nana B. Walker, 1912
Bulinus nasutus E.C. Von Martens, 1879
Ferrissia natalensis B. Walker, 1924
Bulinus natalensis H.C. Küster, 1841
Afrogyrorbis natalensis (C.F.F. von Krauss, 1848)
Gyraulus nautiliformis (Gozhik & Prysjazhnjuk,1978)
Gyraulus nedici (Š. Brusina, 1902)
Gyraulus nedyalkovi P. Glöer & D.G. Georgiev,2012
Gyraulus nematophorus (Š. Brusina, 1902)
Ferrissia neozelanica (H.H. Suter, 1905)
Ferrissia neumayri (FOSSIL) (C.F. Fontannes, 1881 †)
Parapholyx nevadensis J. Henderson, 1934
Helisoma newberryi H.C. Lea, 1858
Helisoma newberryi occidentalis G.D. Hanna, 1924
Isidorella newcombi (A. Adams & G.F. Angas,1864)
Biomphalaria nicaraguana (P.M.A. Morelet, 1851)
Helisoma nigricans (J.B. von Spix, 1827)
Anisus nikolensis (W. Dybowski, 1913)
Laevapex nipponica J.T. Kuroda, 1947
Camptoceras nipponica B. Walker, 1919
Planorbis nisseanus (FOSSIL) P.S. Pavlovic, 1931 †
Segmentina nitida (O.F. Müller, 1774)
Polypylis nitidella (E.C. Von Martens, 1877)
Drepanotrema nordestense (I.D. Lucena, 1954)
Gyraulus novaki (Š. Brusina, 1897)
Anisus noziriensis A. Mori, 1938