Triphora nodosoplicata (FOSSIL) (É.A. Benoist, 1874 †) France, Aquitaine6 mm
Inella noduloides E. Rolán& R. Fernández-Garcés, 2008 Bahamas
Teretriphora novapostrema (J.C. Verco, 1910) South Australia
Coriophora novem (G.W. Nowell-Usticke,1969) Virgin Islands
Inella numerosa F.P. Jousseaume, 1898 Yemen
Obesula obesula (F.P. Jousseaume, 1884) Canary Islands5,7 mm
Inella obliqua (W.L. May, 1915) Tasmania
Mastonia obtusa C.F. Laseron, 1958 New South Wales
Viriolopsis occidua B.A. Marshall, 1983 Western Australia
Viriola oceanica C.F. Laseron, 1958 Queensland
Litharium oceanida (W.H. Dall, 1924) Hawaii3 mm
Mastoniaeforis ofuensis (F. Baker& V.D.P. Spicer, 1935)
Monophorus olivaceus (W.H. Dall, 1889) Tobago Island7,7 mm
Isotriphora onca M.R. Fernandes, A. Pimenta& J.H. Leal, 2013 Brazil, Trindade Island5,6 mm
Iniforis ordinata C.F. Laseron, 1958 Hawaii4 mm
Triphora oreada P. Bartsch, 1915
Cosmotriphora oreodoxa (A.A. Olsson& A. Harbison, 1953) USA, Louisiana
Cosmotriphora ornata (G.P. Deshayes, 1832) Bahamas8 mm
Triphora osclausum E. Rolán& R. Fernández-Garcés, 1995 Cuba
Marshallora ostenta E. Rolán& R. Fernández-Garcés, 2008 USA, Louisiana
Bouchetriphora otsuensis (M. Yokoyama, 1920) Indo-Pacific
Triphora oweni F. Baker, 1926 Galapagos
Mastoniaeforis pagodiformis (FOSSIL) Darragh, 2017 †
Viriola pagodus (R.B. Hinds, 1843) Hawaii53 mm
Coriophora pallenta (C.F. Laseron, 1958) Queensland
Cheirodonta pallescens (J.G. Jeffreys, 1867) Italy, Ancona5 mm
Bouchetriphora pallida (W.H. Pease, 1871)
Costatophora pallida (S. Kosuge, 1962) Philippines, Mactan Island7 mm
Triphora palmeri A.M. Strong& L.G. Hertlein, 1939 West America
Triphora panamensis P. Bartsch, 1907 West Panama
Obesula pantherina F.P. Jousseaume, 1898 Djibouti2,7 mm
Monophorus pantherinus E. Rolán & A. Peñas, 2001 Canary Islands, Tenerife15,47 mm
Triphora papaveracea (FOSSIL) (É.A. Benoist, 1874 †) France, Aquitaine6,3 mm
Mastonia papillata (R.P.J. Hervier, 1898) Tonga5 mm
Triphora patricia K.H.J. Thiele, 1925