Genota omaliusi (FOSSIL) (M. Rouault, 1849 †)
Borsonella omphale W.H. Dall, 1919
Cordieria oppenheimi (FOSSIL) A.E.M. Cossmann & G. Pissarro †,
Awateria optabilis (R. Murdoch & H.H. Suter,1906)
Microdrillia optima (K.H.J. Thiele, 1925)
Zemacies ordinaria (FOSSIL) (P. Marshall, 1918 †)
Filodrillia ordinata C.F. Laseron, 1954
Maoritomella orientalis R.K. Dell, 1956
Asthenotoma ornata (FOSSIL) (J.L.M. Defrance, 1826 †)
Asthenotoma ornata atticae (F. Nordsieck, 1977)
Filodrillia ornata C. Hedley, 1922
Tomopleura oscitans R.N. Kilburn, 1986
Borsonia otwayensis (FOSSIL) A.E.M. Cossmann, 1896 †
Microdrillia ouchitae (FOSSIL) G.F. Harris, 1937 †
Suavodrillia oyamai (FOSSIL) K. Chinzei, 1959 †
Bathytoma pacifica (FOSSIL) R.L. Squires, 2001 †
Maoritomella pagodula (FOSSIL) Powell, 1942 †
Microdrillia pakaurangia (FOSSIL) Powell, 1942 †
Borsonia palensis (FOSSIL) (M. Rouault, 1849 †)
Asthenotoma pannoides (FOSSIL) (A. von Koenen, 1872 †)
Asthenotoma pannus (B. de Basterotin L.M.D. Bellardi, 1847 )
Genota papalis (L.A. Reeve, 1843)
Genota papillaris (R.B. Hinds, 1843)
Bathytoma paracantha (FOSSIL) (J.E. Tenison-Woods,1877 †)
Bathytoma paratractoides N. Puillandre, A.V. Sysoev, B.M. Olivera& P. Bouchet, 2010
Bathytoma parengonia (R.K. Dell, 1956)
Microdrillia patricia (J.C. Melvill, 1904)
Bathytoma paucispiralis (FOSSIL) (Powell, 1942 †)
Typhlodaphne payeni (A. de Rochebrune& J.F. Mabille, 1885)
Moniliopsis paytensis (FOSSIL) A.A. Olsson, 1930 †
Bathytoma pergracilis (FOSSIL) (J. Marwick, 1931 †)
Filodrillia pergradata B.C. Cotton, 1947
Phenatoma perlata (FOSSIL) (H.H. Suter, 1917 †)
Asthenotoma perlonga (FOSSIL) (K. Martin, 1884 †)
Glyptaesopus perornatus (FOSSIL) H.A. Pilsbry& A.A. Olsson, 1941 †