Aperostoma leai P. Bartsch& J.P.E. Morrison, 1942
Fijiopoma liberata (A. Garrett, 1887)
Poteria lineata (E. Chitty, 1857)
Dicrista liobasis F.G. Thompson, 1969
Amphicyclotus liratus (H. Drouët, 1859)
Cyclochittya magister (P. Bartsch, 1942)
Poteria magna E. Chitty, 1857
Amphicyclotus maleri J.C.H. Crosse& P.H. Fischer, 1883
Aperostoma manabense C. de la Torre, P. Bartsch& J.P.E. Morrison, 1942
Poteria manchesterensis (P. Bartsch, 1942)
Poteria marianna (P. Bartsch, 1942)
Bartschivindex martensi (W. Kobelt, 1912)
Poteria martensis (W. Kobelt, 1912)
Buckleyia martinezi (J.G. Hidalgo, 1866)
Incerticyclus martinicensis (R.J. Shuttleworth, 1857)
Amphicyclotus megaplanus J.P.E. Morrison, 1955
Neocyclotus merrilli (P. Bartsch& J.P.E. Morrison, 1942)
Aperostoma mexicanum (K.T. Menke, 1830)
Amphicyclotus mineri P. Bartsch, 1942
Poteria minor (E. Chitty, 1857)
Poteria montegoensis P. Bartsch, 1942
Cyclopomops moricandi (L. Pfeiffer, 1852)
Cyclobakeria nana P. Bartsch, 1942
Incidostoma nanun (P. Bartsch& J.P.E. Morrison, 1942)
Aperostoma nicaraguense P. Bartsch& J.P.E. Morrison, 1942
Poteria niceforana H.A. Pilsbry, 1939
Calaperostoma nigrofasciatum (K. Miller, 1879)
Poteria nodosa E. Chitty, 1857
Poteria notata E. Chitty, 1857
Cyclobakeria notatior (E. Chitty, 1857)
Cyclobakeria novaespei (E. Chitty, 1857)
Poteria novussaltus E. Chitty, 1857
Calacyclotus olssoni (H.A. Pilsbry, 1926)
Poteria orcutti P. Bartsch, 1942
Aperostoma pailaense C. de la Torre, P. Bartsch& J.P.E. Morrison, 1942