Doryssa macapa (S. Moricand, 1856)
Madagasikara madagascarensis J.P.S. Grateloup
Madagasikara madagascariensis (J.P.S. Grateloup, 1840)
Tylomelania mahalonensis (J.H. Kruimel, 1913)
Brotia manningi R.A.M. Brandt, 1974
Brotia mariae F. Köhler, 2008
Paracrostoma martini F. Köhler & M. Glaubrecht,2007
Tylomelania marwotoae T. von Rintelen, P. Bouchet& M. Glaubrecht, 2007
Tylomelania masapensis (J.H. Kruimel, 1913)
Tylomelania matannensis T. von Rintelen, P. Bouchet& M. Glaubrecht, 2007
Potadoma medjeorum H.A. Pilsbry& J.C. Bequaert, 1927
Brotia melanioides (FOSSIL) (J. de C. Sowerby,1816 †)
Brotia melanioides bicoronata (FOSSIL) Staadt in A.E.M. Cossmann,1913 †
Brotia microsculpta R.A.M. Brandt, 1968
Doryssa millepunctata (G.W. Tryon, 1865)
Oxymelania moctezumensis H.A. Pilsbry & A. Hinkley,1910
Potadoma moerchi L.A. Reeve, 1859
Tylomelania molesta (P.B. Sarasin& K.F. Sarasin, 1897)
Oxymelania monachus H.A. Pilsbry & A. Hinkley,1910
Potadoma mungwana H.A. Pilsbry& J.C. Bequaert, 1927
Pseudobellardia muttii (FOSSIL) Dominici & T. Kowalke,2014 †
Sulcospira nagiensis (FOSSIL) Matsuoka & Taguchi,2013 †
Bellatara narica (FOSSIL) (E.W. Vredenburg, 1925 †)
Tylomelania neritiformis (P.B. Sarasin& K.F. Sarasin, 1897)
Pachychilus nigratus (F. Poey, 1858)
Nodifaunus nodosus (FOSSIL) A.A. Olsson, 1944 †
Potadoma nyongensis G.C. Spence, 1928
Glyptomelania obeliscus (L.A. Reeve, 1861)
Tinnyea obilici (FOSSIL) (Atanackovic, 1959 †)
Tinnyea obsoleta (FOSSIL) (Lomnicki, 1886 †)
Pachychilus oerstedi O.A.L. Mörch, 1860
Brotia oppenoorthi (FOSSIL) C.H. Oostingh, 1935 †
Eginea ornata (FOSSIL) (G.P. Deshayes, 1862 †)
Doryssa ornata (F. Poey, 1858)
Pachychilus orstedi (O.A.L. Mörch, 1860)