Between brackets is the number of accepted species

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- Mollusca (132 754)
- Subphylum Aculifera
- Subphylum Conchifera
- Subphylum Placophora accepted as Polyplacophora
- Superclass Aplacophora
- Class Amphineura accepted as Aculifera
- Class Bivalvia (24 992)
- Class Caudofoveata (143)
- Class Cephalopoda (1 832)
- Class Conchifera accepted as Bivalvia
- Class Cricoconarida † (1)
- Class Gastropoda (102 679)
- Subclass Amphigastropoda † (387)
- Subclass Angiogastropoda represented as Gastropoda
- Subclass Apogastropoda
- Subclass Caenogastropoda (53 623)
- Subterclass Sorbeoconcha (147)
- Superorder Hypsogastropoda
- Order Architaenioglossa (4 917)
- Order Caenogastropoda incertae sedis (7 675)
- 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) (1 091)
- 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 (2 157)
- Family Berendinellidae Guzhov, 2005 † (1)
- Family Cerithiopsidae H. Adams & A. Adams, 1853 (1 154)
- 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)
- Species Isotriphora amethystina B. A. Marshall, 1983
- Species Isotriphora aureovincta (Verco, 1910)
- Species Isotriphora bilineata Kosuge, 1962 accepted as Litharium bilineatum (Kosuge, 1962)
- Species Isotriphora disjuncta (Verco, 1909)
- Species Isotriphora echina Laseron, 1954 accepted as Isotriphora tasmanica (Tenison Woods, 1876)
- Species Isotriphora guanahacabibes Rolán & Fernández-Garcés, 2008
- Species Isotriphora guanahacahibes [sic] accepted as Isotriphora guanahacabibes Rolán & Fernández-Garcés, 2008
- Species Isotriphora kurodai Kosuge, 1962 accepted as Litharium kurodai (Kosuge, 1962)
- Species Isotriphora leo M. Fernandes & Pimenta, 2020
- Species Isotriphora nivea (Verco, 1909) accepted as Triphora nivea Verco, 1909
- Species Isotriphora onca M. Fernandes, Pimenta & Leal, 2013
- Species Isotriphora pardus M. Fernandes, 2024
- Species Isotriphora peetersae (Moolenbeek & Faber, 1989)
- Species Isotriphora salisburyensis (Ludbrook, 1957) †
- Species Isotriphora simulata B. A. Marshall, 1983
- Species Isotriphora taenialba Rolán & Espinosa, 1994
- Species Isotriphora tasmanica (Tenison Woods, 1876)
- Species Isotriphora tigrina M. Fernandes, Pimenta & Leal, 2013
- Species Isotriphora tricingulata Rolán & Fernández-Garcés, 2015
- Species Isotriphora uncia M. Fernandes & Pimenta, 2020
- Species Isotriphora vercoi B. A. Marshall, 1983
- 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
- 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 (17 171)
- Order Neogastropoda (23 713)
- Order Stenoglossa accepted as Neogastropoda
- Subclass Gastropoda incertae sedis (308)
- Subclass Heterobranchia (39 154)
- Subclass Neomphaliones accepted as Vetigastropoda
- Subclass Neritimorpha (1 914)
- Subclass Orthogastropoda represented as Gastropoda
- Subclass Patellogastropoda (511)
- Subclass Prosobranchia
- Subclass Psilogastropoda represented as Gastropoda
- Subclass Vetigastropoda (6 782)
- 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 (1 377)
- Class Polyplaxiphora accepted as Polyplacophora
- Class Rostroconchia † (64)
- Class Scaphopoda (752)
- Class Solenoconchia accepted as Scaphopoda
- Class Solenogastres (313)
- Subclass Chaetodermomorpha accepted as Caudofoveata