Heliacus oceanitis (R. Bieler, 1993)
Stellaxis oligostriatum (FOSSIL) F. Sacco, 1896 †
Solatisonax orba R. Bieler, 1993
Architectonica ornata (FOSSIL) (Lea, 1833 †)
Architectonica ornatissima (FOSSIL) Seeley, 1864 †
Stellaxis ornatoparvum (FOSSIL) F. Sacco, 1896 †
Psilaxis oxytropis (A. Adams, 1855)
Architectonica oyamai (FOSSIL) O. Masuda & H. Noda,1976 †
Pseudotorinia panamensis (P. Bartsch, 1918)
Pseudomalaxis pateriformis (FOSSIL) L.W. Stephenson, 1955 †
Pseudomalaxis pateriforrnis (FOSSIL) L.W. Stephenson, 1955 †
Torinia patula (FOSSIL) (J.B.P.A. Lamarck,1804 †)
Climacopoma patulum (FOSSIL) (J.B.P.A. Lamarck,1804 †)
Architectonica perdix R.B. Hinds, 1844
Architectonica perspectiva (C. Linnaeus, 1767)
Discotectonica petasus (J.R. le B. Tomlin, 1928)
Pseudotorinia phorcysi D.C. Cavallari, R.B. Salvador& L.R.L. Simone, 2014
Architectonica pisoliticum (FOSSIL) W.H. Hudleston, 1892 †
Discotectonica placentalis (R.B. Hinds, 1844)
Architectonica plana (FOSSIL) Seeley, 1861 †
Wangaloa plana (FOSSIL) (P. Marshall, 1917 †)
Dinaxis planiformis (FOSSIL) (T.H. Aldrich, 1895 †)
Torinista planispira H.A. Pilsbry & H.N. Lowe,1932
Pseudomalaxis planoconcavus (FOSSIL) (M. Rouault, 1849 †)
Architectonica planorbis (FOSSIL) F.A. Roemer, 1888 †
Pseudotorinia planulata (J.P.S. Grateloup, 1832)
Discotectonica platyplagia (FOSSIL) (R.K. Dell, 1952 †)
Architectonica plesiomorpha (FOSSIL) A.E.M. Cossmann& G. Pissarro, 1902 †
Architectonica plicata (FOSSIL) (J.B.P.A. Lamarck,1804 †)
Architectonica plicatula (FOSSIL) G.P. Deshayes, 1832 †
Architectonica polygonoides (FOSSIL) W.H. Hudleston, 1892 †
Heliacus ponderi (T.A. Garrard, 1978)
Pseudomalaxis praemeridionalis (FOSSIL) A.C. Chapman, 1912 †
Architectonica proestleri A. Alf & K. Kreipl, 2001
Solatisonax propinqua R. Bieler, 1993