Geotrochus obscura J.J. Vermeulen, M. Schilthuizen& T.S. Liew MS Malaysia, Borneo
Helicarion obscurior Hyman, Lamborena& Köhler, 2017
Nipponochlamys obtusa (C.A. Westerlund, 1883) Japan
Parakaliella obtusangula (O.W.H. Reinhardt, 1883) Japan
Erepta odontina P.M.A. Morelet, 1851 Mascarene Islands
Geotrochus oedobasis J.J. Vermeulen, T.S. Liew& M. Schilthuizen, 2015
Helicarion ogasawarana H.A. Pilsbry, 1902 Japan
Trochochlamys okinoshimana (H.A. Pilsbry& Y. Hirase, 1904) Japan, Kochi
Inozonites orthostoma (L. Pfeiffer, 1845)
Helicarion osimakiheijii J.T. Kuroda, 1953 Japan
Parakaliella otakiana (Y. Hirase, 1909) Japan
Irenella otareae A. Garrett Fiji Islands
Parakaliella pagoduloides (G.P.L.K. Gude, 1900) Japan, Hyogo
Geotrochus pallida (E.A. Smith, 1895) Malaysia, Borneo
Hemiglypta panayensis (W.J. Broderip, 1842) Philippines, Mindoro Island43 mm
Hemiglypta panayensis connectens O.F. von Möllendorff,1898 Philippines, Surigao90,3 mm
Lepidotrichia pandana (P. Bartsch, 1942)
Petalochlamys par (P.B. Schmacker& O. Böttger, 1891) Japan
Geotrochus paraguensis (E.A. Smith, 1893) Malaysia, Borneo
Cucullarion parkini J. Stanisic, 1998 Australia, Brisbane
Sivella paviei (L.J. Morlet, 1884) Vietnam, Tonkin
Petalochlamys perfragilis (H.A. Pilsbry, 1901) Japan, Kagoshima
Petalochlamys perfragilis sakui H.A. Pilsbry & Y. Hirase,1908 Japan, Tanegashima Island
Dupontia perlucida (A. Adams, 1867) Mascarene Islands
Panulena perrugosa T. Iredale, 1945 Norfolk Island, EXTINCT
Orpiella pfeifferi (R.A. Philippi, 1845)
Mathewsoconcha phillipii (J.E. Gray, 1834) Norfolk Island
Caldwellia philyrina (P.M.A. Morelet, 1851) Madagascar
Parakaliella phyllophila (A. Adams, 1868) Japan
Helicarion planilabris J.C. Cox, 1866 New South Wales
Helicarion planospirus (L. Pfeiffer, 1853)
Roybellia platysoma (E.R. Sykes, 1900) Norfolk Island
Dendrotrochus ponapensis H.B. Baker, 1941 Micronesia
Levidens ponderi I. Hyman, 2007 New South Wales
Helicarion porrectus T. Iredale, 1941 Australia, Dungog