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- Mollusca (133 221)
- Subphylum Aculifera
- Subphylum Conchifera
- Subphylum Placophora accepted as Polyplacophora
- Superclass Aplacophora
- Class Amphineura accepted as Aculifera
- Class Bivalvia (25 077)
- Class Caudofoveata (143)
- Class Cephalopoda (1 917)
- Class Conchifera accepted as Bivalvia
- Class Cricoconarida † (1)
- Class Gastropoda (102 971)
- Subclass Amphigastropoda † (434)
- Subclass Angiogastropoda represented as Gastropoda
- Subclass Apogastropoda
- Subclass Caenogastropoda (53 793)
- Subterclass Sorbeoconcha (147)
- Superorder Hypsogastropoda
- Order Architaenioglossa (4 921)
- Order Caenogastropoda incertae sedis (7 676)
- Suborder Heteroglossa
- Suborder Ptenoglossa
- Superfamily Abyssochrysoidea Tomlin, 1927 (104)
- Superfamily Acteoninoidea Cossmann, 1895 †
- Superfamily Campaniloidea (288)
- Superfamily Cerithioidea J. Fleming, 1822 (3 706)
- Superfamily Cerithiopsoidea accepted as Triphoroidea J. E. Gray, 1847
- Superfamily Epitonioidea S. S. Berry, 1910 (1812) (1 093)
- Superfamily Eulimacea accepted as Eulimoidea R. A. Philippi, 1853
- Superfamily Orthonematoidea Nützel & Bandel, 2000 † (107)
- Superfamily Palaeostyloidea Wenz, 1938 † (17)
- Superfamily Peruneloidea Frýda & Bandel, 1997 † (3)
- Superfamily Soleniscoidea Knight, 1931 † (52)
- Superfamily Subulitoidea Lindström, 1884 † (11)
- Superfamily Triphoroidea J. E. Gray, 1847 (2 156)
- Family Berendinellidae Guzhov, 2005 † (1)
- Family Cerithiopsidae H. Adams & A. Adams, 1853 (1 153)
- Family Eumetulidae A. N. Golikov & Starobogatov, 1975 accepted as Eumetulinae A. N. Golikov & Starobogatov, 1975
- Family Newtoniellidae Korobkov, 1955 (206)
- Family Triforidae accepted as Triphoridae J. E. Gray, 1847
- Family Triphoridae J. E. Gray, 1847 (796)
- Subfamily Iniforinae Kosuge, 1966 (45)
- Subfamily Mastoniinae Kosuge, 1966 accepted as Triphorinae J. E. Gray, 1847
- Subfamily Metaxiinae B. A. Marshall, 1977 (41)
- Subfamily Triphorinae J. E. Gray, 1847 (709)
- Genus Aclophora Laseron, 1958 (12)
- Genus Aclophoropsis B. A. Marshall, 1983 (4)
- Genus Biforina Bucquoy, Dautzenberg & Dollfus, 1884 accepted as Monophorus Granata Grillo, 1877
- Genus Bouchetriphora B. A. Marshall, 1983 (6)
- Genus Brucetriphora Beu, 2004 accepted as Costatophora B. A. Marshall, 1994
- Genus Callitriphora Cotton, 1947 † (1)
- Genus Cautor H. J. Finlay, 1926 (6)
- Genus Cautotriphora Laws, 1940 (6)
- Genus Cheirodonta B. A. Marshall, 1983 (3)
- Genus Cinctrifora Olsson & Harbison, 1953 † (1)
- Genus Coriophora Laseron, 1958 (33)
- Genus Cosmotriphora Olsson & Harbison, 1953 (4)
- Genus Costatophora B. A. Marshall, 1994 (9)
- Genus Distophora Laseron, 1958 accepted as Teretriphora H. J. Finlay, 1926
- Genus Eocautor Eames, 1952 † (1)
- Genus Epetrium G. F. Harris & Burrows, 1891 † (8)
- Genus Euthymella Thiele, 1929 (16)
- Genus Euthymia Jousseaume, 1884 accepted as Euthymella Thiele, 1929 (1)
- Genus Eutriphora Cotton & Godfrey, 1931 (7)
- Genus Hedleytriphora B. A. Marshall, 1983 (5)
- Genus Huetriphora Caro & Bertrand, 2020 (1)
- Genus Hypotriphora Cotton & Godfrey, 1931 (1)
- Genus Inella Bayle, 1879 (76)
- Genus Ino Hinds, 1843 accepted as Inella Bayle, 1879
- Genus Ionthoglossa Vinola-Lopez & Bouchet, 2020 (1)
- Genus Isotriphora Cotton & Godfrey, 1931 (16)
- Genus Latitriphora B. A. Marshall, 1983 (7)
- Genus Liniphora Laseron, 1958 (1)
- Genus Litharium Dall, 1924 (6)
- Genus Macrosinister Laseron, 1954 accepted as Magnosinister Laseron, 1954
- Genus Magnosinister Laseron, 1954 (1)
- Genus Marshallora Bouchet, 1985 (10)
- Genus Mastonia Hinds, 1843 (44)
- Genus Mesophora Laseron, 1958 accepted as Coriophora Laseron, 1958
- Genus Metalepsis Jousseaume, 1884 † accepted as Ogivia G. F. Harris & Burrows, 1891 †
- Genus Monophorus Granata Grillo, 1877 (40)
- Genus Nanaphora Laseron, 1958 (19)
- Genus Norephora Gründel, 1975 accepted as Inella Bayle, 1879
- Genus Notosinister H. J. Finlay, 1926 accepted as Monophorus Granata Grillo, 1877
- Genus Nototriphora B. A. Marshall, 1983 (8)
- Genus Obesula Jousseaume, 1898 (16)
- Genus Ogivia G. F. Harris & Burrows, 1891 † (7)
- Genus Opimaphora Laseron, 1958 (12)
- Genus Orbitophora Laseron, 1958 accepted as Viriola Jousseaume, 1884
- Genus Oriforina Gründel, 1975 † (2)
- Genus Pogonodon Bouchet, 1997 accepted as Ionthoglossa Vinola-Lopez & Bouchet, 2020
- Genus Sagenotriphora B. A. Marshall, 1983 (4)
- Genus Seilarex Iredale, 1924 (3)
- Genus Similiphora Bouchet, 1985 (5)
- Genus Sinistroseila W. R. B. Oliver, 1915 accepted as Viriola Jousseaume, 1884
- Genus Solosinister Laseron, 1954 accepted as Viriola Jousseaume, 1884
- Genus Strobiligera Dall, 1924 (25)
- Genus Stylia Jousseaume, 1884 † accepted as Epetrium G. F. Harris & Burrows, 1891 †
- Genus Subulophora Laseron, 1958 (11)
- Genus Subviriola Amitrov & Zhegallo, 2007 † (1)
- Genus Sychar Hinds, 1843 (1)
- Genus Talophora Gründel, 1975 (1)
- Genus Teretriphora H. J. Finlay, 1926 (6)
- Genus Tetraphora Laseron, 1958 accepted as Costatophora B. A. Marshall, 1994
- Genus Torresophora Laseron, 1958 accepted as Euthymella Thiele, 1929
- Genus Trifora [sic] accepted as Triphora Blainville, 1828
- Genus Triforis Deshayes, 1834 accepted as Triphora Blainville, 1828
- Subgenus Triforis (Biforina) Bucquoy, Dautzenberg & Dollfus, 1884 accepted as Monophorus Granata Grillo, 1877
- Subgenus Triforis (Epetrium) G. F. Harris & Burrows, 1891 † accepted as Epetrium G. F. Harris & Burrows, 1891 †
- Subgenus Triforis (Granulotriforis) Kosuge, 1967 accepted as Trituba (Granulotriforis) Kosuge, 1967
- Subgenus Triforis (Inella) Bayle, 1879 accepted as Inella Bayle, 1879
- Subgenus Triforis (Iniforis) Jousseaume, 1884 accepted as Iniforis Jousseaume, 1884
- Subgenus Triforis (Ino) Hinds, 1843 accepted as Inella Bayle, 1879
- Subgenus Triforis (Mastonia) Hinds, 1843 accepted as Mastonia Hinds, 1843
- Species Triforis (Mastonia) amoena Hervier, 1898 accepted as Triphora amoena Hervier, 1898
- Variety Triforis (Mastonia) amoena var. basirufa Hervier, 1899
- Species Triforis (Mastonia) auberti Abrard, 1947 † accepted as Mastonia auberti (Abrard, 1947) †
- Species Triforis (Mastonia) fulvescens Hervier, 1898 accepted as Mastonia fulvescens (Hervier, 1898)
- Species Triforis (Mastonia) lamberti Hervier, 1898 accepted as Mastonia lamberti (Hervier, 1898)
- Species Triforis (Mastonia) leucomys Hervier, 1898 accepted as Nanaphora leucomys (Hervier, 1898)
- Species Triforis (Mastonia) loyaltyensis Hervier, 1898 accepted as Mastonia loyaltyensis (Hervier, 1898)
- Species Triforis (Mastonia) lucidula Hervier, 1898 accepted as Monophorus lucidulus (Hervier, 1898)
- Species Triforis (Mastonia) mediotincta Hervier, 1898 accepted as Mastonia mediotincta (Hervier, 1898)
- Species Triforis (Mastonia) monacha Hervier, 1898 accepted as Monophorus monachus (Hervier, 1898)
- Species Triforis (Mastonia) papillata Hervier, 1898 accepted as Mastonia papillata (Hervier, 1898)
- Species Triforis (Mastonia) quadrimaculata Hervier, 1898 accepted as Monophorus quadrimaculatus (Hervier, 1898)
- Species Triforis (Mastonia) taeniolata Hervier, 1898 accepted as Triphora taeniolata Hervier, 1898
- Species Triforis (Mastonia) troglodytes Hervier, 1898 accepted as Mastonia troglodytes (Hervier, 1898)
- Species Triforis (Mastonia) turricula Hervier, 1898 accepted as Obesula turricula (Hervier, 1898)
- Species Triforis (Mastonia) ustulata Hervier, 1898 accepted as Coriophora ustulata (Hervier, 1898)
- Subgenus Triforis (Mastoniaeforis) Jousseaume, 1884 accepted as Mastoniaeforis Jousseaume, 1884
- Subgenus Triforis (Metalepsis) Jousseaume, 1884 † accepted as Ogivia G. F. Harris & Burrows, 1891 †
- Subgenus Triforis (Monophorus) Granata Grillo, 1877 accepted as Monophorus Granata Grillo, 1877
- Subgenus Triforis (Paramendax) A. W. B. Powell, 1937 accepted as Paramendax A. W. B. Powell, 1937
- Subgenus Triforis (Stylia) Jousseaume, 1884 † accepted as Epetrium G. F. Harris & Burrows, 1891 †
- Subgenus Triforis (Sychar) Hinds, 1843 accepted as Sychar Hinds, 1843
- Subgenus Triforis (Tauroforis) Sacco, 1895 † accepted as Trituba Jousseaume, 1884
- Subgenus Triforis (Triforis) Deshayes, 1834 accepted as Triphora Blainville, 1828
- Subgenus Triforis (Trituba) Jousseaume, 1884 accepted as Trituba Jousseaume, 1884
- Subgenus Triforis (Viriola) Jousseaume, 1884 accepted as Viriola Jousseaume, 1884
- Species Triforis abnormalis G. B. Sowerby III, 1903 accepted as Ataxocerithium abnormale (G. B. Sowerby III, 1903)
- Species Triforis adversa (Montagu, 1803) accepted as Marshallora adversa (Montagu, 1803)
- Species Triforis aequilirata O. Boettger, 1902 † accepted as Triphora eugeniae O. Boettger, 1902 †
- Species Triforis affinis Deshayes, 1865 † accepted as Triphora affinis Deshayes, 1865 †
- Species Triforis ambiguus Deshayes, 1864 † accepted as Inella ambigua (Deshayes, 1864) †
- Species Triforis americanus Aldrich, 1885 † accepted as Sinistrella americana (Aldrich, 1885) †
- Species Triforis anelpistos Bouchet & Fechter, 1981 accepted as Trituba anelpistos (Bouchet & Fechter, 1981)
- Species Triforis antepallaxa B. A. Marshall, 1977 accepted as Trituba (Granulotriforis) antepallaxa (B. A. Marshall, 1977)
- Species Triforis apicina (A. W. B. Powell, 1937) accepted as Paramendax apicina A. W. B. Powell, 1937
- Species Triforis arthuri Jousseaume, 1884 accepted as Nototriphora decorata (C. B. Adams, 1850)
- Species Triforis asper [sic] accepted as Strobiligera brychia (Bouchet & Guillemot, 1978)
- Species Triforis aspera Jeffreys, 1885 accepted as Strobiligera brychia (Bouchet & Guillemot, 1978)
- Species Triforis aspera Deshayes, 1864 † accepted as Triphora aspera Deshayes, 1864 †
- Species Triforis atlantica E. A. Smith, 1890 accepted as Triphora atlantica E. A. Smith, 1890
- Species Triforis attenuatispira (A. W. B. Powell, 1937) accepted as Paramendax attenuatispira (A. W. B. Powell, 1937)
- Species Triforis bacillus Deshayes, 1864 † accepted as Triphora bacillus Deshayes, 1864 †
- Species Triforis barbadensis Coomans & Faber, 1984 accepted as Trituba barbadensis (Coomans & Faber, 1984)
- Species Triforis bathyraphe E. A. Smith, 1890 accepted as Triphora bathyraphe E. A. Smith, 1890
- Species Triforis benoitiana Aradas, 1869 accepted as Monophorus perversus (Linnaeus, 1758)
- Species Triforis bigemma (R. B. Watson, 1880) accepted as Strobiligera bigemma (R. B. Watson, 1880)
- Species Triforis bigranosa Koenen, 1891 † accepted as Triphora bigranosa Koenen, 1891 †
- Species Triforis bilineata O. Meyer, 1886 † accepted as Triphora bilineata O. Meyer, 1886 †
- Species Triforis bilineata Benoist, 1874 †
- Species Triforis biplicatus A. Rouault, 1850 † accepted as Ogivia biplicata (A. Rouault, 1850) †
- Species Triforis bitubulatus Baudon, 1856 † accepted as Trituba bitubulata (Baudon, 1856) †
- Species Triforis bitubulatus Baudon, 1856 † accepted as †
- Species Triforis blacki B. A. Marshall, 1977 accepted as Trituba (Granulotriforis) blacki (B. A. Marshall, 1977)
- Species Triforis breviculus Cossmann, 1889 † accepted as Oriforina brevicula (Cossmann, 1889) †
- Species Triforis calculiferus Gould, 1861 accepted as Iniforis calculifera (A. Gould, 1861)
- Species Triforis calypsonis Maury, 1917 † accepted as Triphora calypsonis Maury, 1917 †
- Species Triforis chevallieri Cossmann, 1896 † accepted as Trituba chevallieri (Cossmann, 1896) †
- Species Triforis cincta Kaunhowen, 1898 † accepted as Triphora cincta Kaunhowen, 1898 †
- Species Triforis cingulata Dunker, 1860 accepted as Viriola tricincta (Dunker, 1882)
- Species Triforis clarae O. Boettger, 1902 † accepted as Triphora clarae O. Boettger, 1902 †
- Species Triforis clathratus A. Gould, 1861 accepted as Euthymella clathrata (A. Gould, 1861)
- Species Triforis clio Hedley, 1899 accepted as Triphora clio Hedley, 1899
- Species Triforis colon Dall, 1881 accepted as Inella colon (Dall, 1881)
- Species Triforis connata (Montrouzier, 1862) accepted as Viriola connata (Montrouzier, 1862)
- Species Triforis conoidalis A. Rouault, 1850 † accepted as Ogivia conoidalis (A. Rouault, 1850) †
- Species Triforis cornuta Hervier, 1898 accepted as Triphora cornuta Hervier, 1898
- Species Triforis costulata Deshayes, 1864 † accepted as Triphora costulata Deshayes, 1864 †
- Species Triforis crassula E. von Martens, 1880 accepted as Mastonia crassula (E. von Martens, 1880)
- Species Triforis cylindrellus Dall, 1881 accepted as Triphora cylindrella Dall, 1881
- Species Triforis decorata (C. B. Adams, 1850) accepted as Nototriphora decorata (C. B. Adams, 1850)
- Species Triforis delicatula Thiele, 1912 accepted as Triphora delicatula (Thiele, 1912)
- Species Triforis diozodes Cossmann, 1889 † accepted as Triphora diozodes Cossmann, 1889 †
- Species Triforis distinctus O. Meyer, 1886 † accepted as Triphora distincta O. Meyer, 1886 †
- Species Triforis distinguenda Dunker, 1881
- Species Triforis dolicha R. B. Watson, 1886 accepted as Coriophora dolicha (R. B. Watson, 1886)
- Species Triforis dollfusi Cossmann, 1893 † accepted as Triphora dollfusi Cossmann, 1893 †
- Species Triforis dominici Gougerot, 1966 † accepted as Trituba dominici (Gougerot, 1966) †
- Species Triforis dujardini Mayer, 1862 †
- Species Triforis dunkeri Jousseaume, 1884 accepted as Viriola tricincta (Dunker, 1882)
- Species Triforis elatior Koenen, 1891 † accepted as Inella elatior (Koenen, 1891) †
- Species Triforis epallaxa (Verco, 1909) accepted as Trituba (Granulotriforis) epallaxa (Verco, 1909)
- Species Triforis episcopalis Hervier, 1898 accepted as Monophorus episcopalis (Hervier, 1898)
- Species Triforis eugeniae O. Boettger, 1902 † accepted as Triphora eugeniae O. Boettger, 1902 †
- Species Triforis excellens E. A. Smith, 1903 accepted as Triphora excellens E. A. Smith, 1903
- Species Triforis excelsior Melvill & Standen, 1899 accepted as Viriola excelsior (Melvill & Standen, 1899)
- Species Triforis exilis Dunker, 1860 accepted as Triphora exilis (Dunker, 1860)
- Species Triforis fasciata Tenison Woods, 1879 accepted as Hedleytriphora fasciata (Tenison Woods, 1879)
- Species Triforis fenestratus Cossmann, 1889 † accepted as Trituba fenestrata (Cossmann, 1889) †
- Species Triforis fontasensis Doncieux, 1908 † accepted as Triphora fontasensis Doncieux, 1908 †
- Species Triforis formosula Hervier, 1898 accepted as Iniforis formosula (Hervier, 1898)
- Species Triforis fulvescens Hervier, 1898 accepted as Triphora fulvescens Hervier, 1898
- Species Triforis fusca Dunker, 1860 accepted as Coriophora fusca (Dunker, 1860)
- Species Triforis goubini Hervier, 1898 accepted as Triphora goubini Hervier, 1898
- Species Triforis gracilior E. A. Smith, 1903 accepted as Triphora gracilior E. A. Smith, 1903
- Species Triforis graniferus Brazier, 1894 accepted as Costatophora granifera (Brazier, 1894)
- Species Triforis grignonensis Deshayes, 1864 † accepted as Epetrium grignonense (Deshayes, 1864) †
- Species Triforis grimaldii Dautzenberg & H. Fischer, 1906 accepted as Cosmotriphora melanura (C. B. Adams, 1850)
- Species Triforis guttata Guppy, 1867 † accepted as Triphora guttata Guppy, 1867 †
- Species Triforis herouvallensis de Raincourt, 1877 † accepted as Inella herouvallensis (de Raincourt, 1877) †
- Species Triforis hildeverti Doncieux, 1908 † accepted as Triphora hildeverti Doncieux, 1908 †
- Species Triforis hircus Dall, 1881 accepted as Triphora hircus Dall, 1881
- Species Triforis ibex Dall, 1881 accepted as Strobiligera ibex (Dall, 1881)
- Species Triforis idoneus Melvill & Standen, 1901 accepted as Triphora idonea Melvill & Standen, 1901
- Species Triforis imperatrix O. Boettger, 1902 † accepted as Triphora imperatrix O. Boettger, 1902 †
- Species Triforis inaequipartitus Deshayes, 1864 † accepted as Ogivia inaequipartita (Deshayes, 1864) †
- Species Triforis incisus Pease, 1861 accepted as Triphora incisa Pease, 1861
- Species Triforis inclita Deshayes, 1864 † accepted as Laeocochlis inclita (Deshayes, 1864) †
- Species Triforis innocens G. B. Sowerby III, 1921 accepted as Triphora innocens G. B. Sowerby III, 1921
- Species Triforis intercalaris Gould, 1861 accepted as Triphora intercalaris A. Gould, 1861
- Species Triforis interfilatus Gould, 1861 accepted as Triphora interfilata A. Gould, 1861
- Species Triforis intermedius Dall, 1881 accepted as Inella intermedia (Dall, 1881)
- Species Triforis isleanus Vélain, 1877 accepted as Triphora isleana Vélain, 1877
- Species Triforis jousseaumei Hervier, 1898 accepted as Mastoniaeforis jousseaumei (Hervier, 1898)
- Species Triforis kanainus Jousseaume, 1884 accepted as Subulophora peasei (Tryon, 1872)
- Species Triforis lacteus Dunker, 1874
- Species Triforis lamberti Hervier, 1898 accepted as Mastonia lamberti (Hervier, 1898)
- Species Triforis leucomys Hervier, 1898 accepted as Nanaphora leucomys (Hervier, 1898)
- Species Triforis lilaceocinctus E. A. Smith, 1903 accepted as Triphora lilaceocincta E. A. Smith, 1903
- Species Triforis lilacina Dall, 1889 accepted as Triphora lilacina Dall, 1889
- Species Triforis loyaltyensis Hervier, 1898 accepted as Mastonia loyaltyensis (Hervier, 1898)
- Species Triforis lucidula Hervier, 1898 accepted as Notosinister lucidulus (Hervier, 1898)
- Species Triforis macandraeae A. Adams, 1856 accepted as Laeocochlis sinistrata (Nyst, 1835)
- Species Triforis major O. Meyer, 1886 † accepted as Triphora major O. Meyer, 1886 †
- Species Triforis malayanus P. J. Fischer, 1921 † accepted as Triphora malayana P. J. Fischer, 1921 †
- Species Triforis martini Dickerson, 1917 †
- Species Triforis mediotincta Hervier, 1898 accepted as Mastonia mediotincta (Hervier, 1898)
- Species Triforis melantera Hervier, 1898 accepted as Triphora melantera Hervier, 1898
- Species Triforis meridionalis O. Meyer, 1886 † accepted as Triphora meridionalis O. Meyer, 1886 †
- Species Triforis minuatus Deshayes, 1864 † accepted as Inella minuata (Deshayes, 1864) †
- Species Triforis mirifica Deshayes, 1863 accepted as Triphora mirifica Deshayes, 1863
- Species Triforis mitella Dall, 1892 † accepted as Triphora mitella Dall, 1892 †
- Species Triforis monacha Hervier, 1898 accepted as Monophorus monachus (Hervier, 1898)
- Species Triforis montrouzieri Hervier, 1898 accepted as Differoforis montrouzieri (Hervier, 1898)
- Species Triforis multigyrata Yokoyama, 1922 † accepted as Latitriphora multigyrata (Yokoyama, 1922) †
- Species Triforis nivea M. Sars, 1859 accepted as Laeocochlis sinistrata (Nyst, 1835)
- Species Triforis niveus [sic] accepted as Laeocochlis sinistrata (Nyst, 1835)
- Species Triforis nodosoplicata Benoist, 1874 † accepted as Triphora nodosoplicata Benoist, 1874 †
- Species Triforis otsuensis Yokoyama, 1920 accepted as Bouchetriphora otsuensis (Yokoyama, 1920)
- Species Triforis papaveracea Benoist, 1874 † accepted as Triphora papaveracea Benoist, 1874 †
- Species Triforis papillata Hervier, 1898 accepted as Mastonia papillata (Hervier, 1898)
- Species Triforis passyi Deshayes, 1864 † accepted as Laeocochlis passyi (Deshayes, 1864) †
- Species Triforis perversus (Linnaeus, 1758) accepted as Monophorus perversus (Linnaeus, 1758)
- Species Triforis pezanti Cossmann, 1913 † accepted as Triphora pezanti Cossmann, 1913 †
- Species Triforis picturatus G. B. Sowerby III, 1901 accepted as Euthymella elegans (Hinds, 1843)
- Species Triforis planata Tenison Woods, 1879 † accepted as Triphora planata Tenison Woods, 1879 †
- Species Triforis plicatus Deshayes, 1834 † accepted as Trituba plicata (Deshayes, 1834) †
- Species Triforis poecila Hervier, 1898 accepted as Iniforis poecila (Hervier, 1898)
- Species Triforis praelonga Koenen, 1891 † accepted as Triphora praelonga Koenen, 1891 †
- Species Triforis pura E. A. Smith, 1903 accepted as Triphora pura E. A. Smith, 1903
- Species Triforis quadrimaculata Hervier, 1898 accepted as Notosinister quadrimaculatus (Hervier, 1898)
- Species Triforis recta E. A. Smith, 1890 accepted as Inella recta (E. A. Smith, 1890)
- Species Triforis regina O. Boettger, 1902 † accepted as Triphora regina O. Boettger, 1902 †
- Species Triforis rufula R. B. Watson, 1886 accepted as Monophorus rufulus (R. B. Watson, 1886)
- Species Triforis rutilans Hervier, 1898 accepted as Subulophora rutilans (Hervier, 1898)
- Species Triforis senafirensis Sturany, 1903 accepted as Viriola senafirensis (Sturany, 1903)
- Species Triforis seranus P. J. Fischer, 1921 † accepted as Costatophora serana (P. J. Fischer, 1921)
- Species Triforis similis O. Meyer, 1886 †
- Species Triforis singularis Deshayes, 1864 † accepted as Ogivia singularis (Deshayes, 1864) †
- Species Triforis staadti Cossmann, 1907 † accepted as Triphora staadti Cossmann, 1907 †
- Species Triforis sulcata Tenison Woods, 1879 † accepted as Triphora sulcata Tenison Woods, 1878 †
- Species Triforis superstes Bouchet & Fechter, 1981 accepted as Trituba superstes (Bouchet & Fechter, 1981)
- Species Triforis taeniolata Hervier, 1898 accepted as Triphora taeniolata Hervier, 1898
- Species Triforis tanseiae Kosuge, 1967 accepted as Trituba (Granulotriforis) tanseiae (Kosuge, 1967)
- Species Triforis tasmanica Tenison Woods, 1876 accepted as Isotriphora tasmanica (Tenison Woods, 1876)
- Species Triforis terebrata Heilprin, 1887 † accepted as Triphora terebrata Heilprin, 1887 †
- Species Triforis tertia Lozouet, 1999 † accepted as Trituba tertia (Lozouet, 1999) †
- Species Triforis thetis Hedley, 1899 accepted as Mastonia thetis (Hedley, 1899)
- Species Triforis torquatus Hedley, 1899 accepted as Coriophora ustulata (Hervier, 1898)
- Species Triforis torticulus Dall, 1881 accepted as Strobiligera torticula (Dall, 1881)
- Species Triforis tricarinata S. Meunier, 1880 † accepted as Triphora tricarinata S. Meunier, 1880 †
- Species Triforis tricincta Dunker, 1882 accepted as Viriola tricincta (Dunker, 1882)
- Species Triforis triforis (A. d'Orbigny, 1850) † accepted as Trituba triforis (A. d'Orbigny, 1850) †
- Species Triforis trilirata Deshayes, 1863 accepted as Viriola trilirata (Deshayes, 1863)
- Species Triforis triserialis Dall, 1881 accepted as Inella triserialis (Dall, 1881)
- Species Triforis troglodytes Hervier, 1898 accepted as Mastonia troglodytes (Hervier, 1898)
- Species Triforis tui B. A. Marshall, 1977 accepted as Trituba (Granulotriforis) tui (B. A. Marshall, 1977)
- Species Triforis ustulata Hervier, 1898 accepted as Coriophora ustulata (Hervier, 1898)
- Species Triforis variegatus A. Adams, 1854 accepted as Nototriphora decorata (C. B. Adams, 1850)
- Species Triforis vermicularis Koenen, 1891 † accepted as Triphora vermicularis Koenen, 1891 †
- Species Triforis violacea (Quoy & Gaimard, 1834) accepted as Iniforis violacea (Quoy & Gaimard, 1834)
- Species Triforis washingtoniana Dickerson, 1915 † accepted as Triphora washingtoniana Dickerson, 1915 †
- Species Triforis wilkinsoni Tenison Woods, 1878 † accepted as Callitriphora wilkinsoni (Tenison Woods, 1878) †
- Genus Triphora Blainville, 1828 (229)
- Genus Triphoris Deshayes, 1830 accepted as Triphora Blainville, 1828
- Genus Viriola Jousseaume, 1884 (29)
- Genus Viriolopsis B. A. Marshall, 1983 (3)
- Genus Austrosinister Laseron, 1954
- Genus Eorex Nützel, 1998 † (1)
- Genus Triphorus [sic] accepted as Triphora Blainville, 1828
- Family Acanthonematidae Wenz, 1938 †
- Family Ampezzanildidae Bandel, 1994 † (1)
- Family Aqabarellidae Alhejoj, Bandel & Al-Najjar, 2016 accepted as Tornidae Sacco, 1896 (1884)
- Family Coelostylinidae Cossmann, 1908 † (16)
- Family Lyocyclidae Thiele, 1925 (37)
- Family Plicatusidae Pan & Erwin, 2002 †
- Family Pragoscutulidae Frýda, 1998 †
- Family Pseudomelaniidae R. Hoernes, 1884 † (81)
- Family Spanionematidae A. N. Golikov & Starobogatov, 1987 †
- Family Spirostylidae Cossmann, 1909 †
- Family Trajanellidae Pchelintsev, 1951 † accepted as Pseudomelaniidae R. Hoernes, 1884 †
- Genus Boreioconus Guzhov, 2015 † (1)
- Genus Costasphaera Gründel & Nützel, 2015 † (1)
- Genus Dicolpus R. A. Philippi, 1887 †
- Genus Nixipileolus Guzhov, 2015 † (1)
- Genus Sassenfjordia Kaim, Hryniewicz, C. Little & Nakrem, 2017 † (1)
- Genus Spirocyclina Kittl, 1894 † accepted as Spirocyclus Wenz, 1938 †
- Genus Spirocyclus Wenz, 1938 †
- Order Littorinimorpha (17 225)
- Order Neogastropoda (23 824)
- Order Stenoglossa accepted as Neogastropoda
- Subclass Gastropoda incertae sedis (309)
- Subclass Heterobranchia (39 217)
- Subclass Neomphaliones accepted as Vetigastropoda
- Subclass Neritimorpha (1 915)
- Subclass Orthogastropoda represented as Gastropoda
- Subclass Patellogastropoda (514)
- Subclass Prosobranchia
- Subclass Psilogastropoda represented as Gastropoda
- Subclass Vetigastropoda (6 789)
- Class Lamellibranchiata accepted as Bivalvia
- Class Loricata accepted as Polyplacophora
- Class Mollusca incertae sedis † (372)
- Class Monoplacophora (229)
- Class Pelecypoda accepted as Bivalvia
- Class Polyplacophora (1 381)
- Class Polyplaxiphora accepted as Polyplacophora
- Class Rostroconchia † (64)
- Class Scaphopoda (753)
- Class Solenoconchia accepted as Scaphopoda
- Class Solenogastres (313)
- Subclass Chaetodermomorpha accepted as Caudofoveata