Teinostoma olssoni (FOSSIL) B.M. Landau, F. Da Silva& S.M. Heitz, 2016 †
Discopsis omalos (L. de Folin, 1870)
Solariorbis oostrombusensis P. Lozouet, 2015
Teinostoma oppletum Hedley, 1898
Solariorbis opsitelotus (FOSSIL) (W.H. Dall, 1892 †)
Tornus orbellus (A. Adams, 1861)
Circulus orbignyi (P. Fischer, 1857)
Caperella orbita (C. Hedley, 1900)
Cyclostremiscus pachynepion H.A. Pilsbry & A.A. Olsson,1945
Solariorbis pachyston (J.C. Verco, 1907)
Solariorbis pacificus H.A. Pilsbry & A.A. Olsson,1952
Anticlimax padangensis (K.H.J. Thiele, 1925)
Tylaxis palaeocenica (FOSSIL) Garvie, 2013 †
Teinostoma pallidulum (P.P. Carpenter, 1847)
Teinostoma panamense F. Rubio, E. Rolán& H.G. Lee, 2011
Cyclostremiscus panamensis (C.B. Adams, 1852)
Tuberes papuensis Rubio & Rolán, 2017
Cochliolepis parasitica (W. Stimpson, 1858)
Teinostoma parvicallum H.A. Pilsbry& J.T.L. McGinty, 1945
Parviturboides parvissimus (C. Hedley, 1899)
Uzumakiella parvulum (C. Hedley, 1899)
Teinostoma parvum (W. Stimpson, 1851)
Cyclostremiscus parvus (C.B. Adams, 1852)
Cochliolepis patricioi F. Rubio, E. Rolán& Y.C. Lee, 2011
Tornus patruelis A. Adams, 1861
Monodosus paucistriatus Rubio & Rolán, 2016
Circulus paulensis (FOSSIL) P. Lozouet, 1998 †
Pleuromalaxis pauli A.A. Olsson& J.T.L. McGinty, 1958
Cyclostremiscus pauli H.A. Pilsbry & A.A. Olsson,1952
Teinostoma pellucidum G.B. I Sowerby
Solariorbis pellucidus H.A. Pilsbry & A.A. Olsson,1952
Vitrinella pelorcei F. Rubio, R. Fernández-Garcés& E. Rolán, 2011
Cyclostremiscus pentagonus (W.M. Gabb, 1873)
Teinostoma percarinatum H.A. Pilsbry & A.A. Olsson,1945
Circulus perlatus J.P.L. Pelseneer, 1903