Rabdotus novoleonis H.A. Pilsbry, 1953 Mexico
Naesiotus nuciformis S.A.A. Petit De La Saussaye, 1853 Galapagos
Vermiculatus nucinus (L.A. Reeve, 1850) South America36,8 mm
Naesiotus nucula (L. Pfeiffer, 1854) Galapagos11,25 mm
Naesiotus nudus P.H. Reibisch, 1892 Galapagos
Naesiotus nux (W.J. Broderip, 1832) Galapagos19 mm
Drymaeus nystianus (L. Pfeiffer, 1853) Ecuador21,4 mm
Bostryx obeliscus A. Zilch, 1954 Peru
Bostryx obliquiportus W.K. Weyrauch, 1960 Peru, Lima
Bostryx obliquistriatus (S.I. Da Costa, 1901) Peru, Cajamarca28,9 mm
Drymaeus occidentalis K. Miller, 1879 Ecuador
Vermiculatus ochraceus (P.M.A. Morelet, 1863) Peru, Cuzco36 mm
Drymaeus ochrocheilus E.A. Smith, 1877 Ecuador37,1 mm
Naesiotus ochsneri W.H. Dall, 1917 Galapagos
Bulimus oldhamianus (FOSSIL) Hislop, 1859 †
Naesiotus olla W.H. Dall, 1893 Galapagos8 mm
Bostryx olmosensis A.S.H. Breure, 1978 Peru
Vermiculatus omissus (W.K. Weyrauch, 1967) Peru, Huallanca
Naesiotus orbignyi (L. Pfeiffer, 1846) Bolivia18,1 mm
Mesembrinus oreades (A.V.M.D. D'Orbigny,1835) Argentina, Corrientes31,6 mm
Drymaeus orobaena (A.V.M.D. D'Orbigny,1835) Bolivia
Bostryx orophilus P.M.A. Morelet, 1863 Peru, Ancash20,7 mm
Bulimulus orthodoxus H. Drouët, 1859 French Guyana
Drymaeus orthostoma E.A. Smith, 1877 Ecuador34,7 mm
Bostryx ortizi W.K. Weyrauch, 1967 Peru, Cajamarca17,7 mm
Scutalus ortizpuentei W.K. Weyrauch, 1967 Peru, Cajamarca48,3 mm
Bulimulus ouallensis A.S.H. Breure& Hovestadt, 2016
Naesiotus oxylabris (A. Doering, 1879) Argentina, Cordoba18 mm
Naesiotus pachys (H.A. Pilsbry, 1897) Brazil, Bahia
Drymaeus paeteli J.A. Albers, 1854 Peru
Drymaeus palassus A.S.H. Breure& A. Eskens, 1981 Peru
Bulimus pallens L.A. Reeve, 1849 17,9 mm
Drymaeus pallidior W.H. Dall, 1893 Costa Rica
Naesiotus pallidior (G.B. I Sowerby, 1833) Mexico, Baja California Sur, La Paz
Naesiotus pallidus P.H. Reibisch, 1892 Galapagos11,3 mm