Between brackets is the number of accepted species

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- Mollusca (132 791)
- Subphylum Aculifera
- Subphylum Conchifera
- Subphylum Placophora accepted as Polyplacophora
- Superclass Aplacophora
- Class Amphineura accepted as Aculifera
- Class Bivalvia (25 009)
- Class Caudofoveata (143)
- Class Cephalopoda (1 834)
- Class Conchifera accepted as Bivalvia
- Class Cricoconarida † (1)
- Class Gastropoda (102 697)
- Subclass Amphigastropoda † (390)
- Subclass Angiogastropoda represented as Gastropoda
- Subclass Apogastropoda
- Subclass Caenogastropoda (53 636)
- Subterclass Sorbeoconcha (147)
- Superorder Hypsogastropoda
- Order Architaenioglossa (4 918)
- Order Caenogastropoda incertae sedis (7 676)
- Order Littorinimorpha (17 179)
- Superfamily Calyptraeoidea Lamarck, 1809 (203)
- Superfamily Capuloidea J. Fleming, 1822 (218)
- Superfamily Cassoidea accepted as Tonnoidea Suter, 1913 (1825)
- Superfamily Cingulopsoidea Fretter & Patil, 1958 (193)
- Superfamily Crepiduloidea J. Fleming, 1822 accepted as Calyptraeoidea Lamarck, 1809
- Superfamily Cypraeoidea Rafinesque, 1815 (1 285)
- Superfamily Eulimoidea R. A. Philippi, 1853 accepted as Vanikoroidea Gray, 1840
- Superfamily Ficoidea Meek, 1864 (1840) (71)
- Superfamily Heteropoda Lamarck, 1812 accepted as Pterotracheoidea Rafinesque, 1814
- Superfamily Hipponicoidea Troschel, 1861 (99)
- Superfamily Littorinoidea Children, 1834 (1 372)
- Superfamily Naticoidea Guilding, 1834 (688)
- Superfamily Pterotracheoidea Rafinesque, 1814 (63)
- Superfamily Rissoacea accepted as Rissooidea Gray, 1847
- Superfamily Rissoinoidea W. Stimpson, 1865 accepted as Rissooidea Gray, 1847
- Superfamily Rissooidea Gray, 1847 (2 311)
- Superfamily Stromboidea Rafinesque, 1815 (835)
- Superfamily Tonnoidea Suter, 1913 (1825) (788)
- Superfamily Truncatelloidea J. E. Gray, 1840 (6 902)
- Superfamily Vanikoroidea Gray, 1840 (1 331)
- Superfamily Velutinoidea Gray, 1840 (648)
- Superfamily Vermetoidea Rafinesque, 1815 (172)
- Family Sakarahellidae Bandel, 2006 † (1)
- Family Vermetidae Rafinesque, 1815 (171)
- Subfamily Dendropomatinae Bandel & Kowalke, 1997
- Subfamily Laxispirinae Bandel, 2006 †
- Subfamily Vermetinae Rafinesque, 1815
- Genus Aletes P. P. Carpenter, 1857 accepted as Thylacodes Guettard, 1770
- Genus Anguillospira Cossmann, 1912 † (1)
- Genus Bivonia Gray, 1842 accepted as Dendropoma Mörch, 1861
- Genus Burtinella Mörch, 1861 † accepted as Rotularia Defrance, 1827 †
- Genus Cayo Bieler, T. M. Collins, Golding & Rawlings, 2023 (4)
- Genus Ceraesignum Golding, Bieler, Rawlings & T. M. Collins, 2014 (2)
- Genus Cerithiovermetus Bandel, 2006 (2)
- Genus Cladopoda Gray, 1850 accepted as Thylacodes Guettard, 1770
- Genus Cupolaconcha Golding, Bieler, Rawlings & T. M. Collins, 2014 (5)
- Genus Dendropoma Mörch, 1861 (29)
- Genus Discovermetulus Rovereto, 1904 †
- Genus Dofania Mörch, 1860
- Genus Eualetes Keen, 1971 (2)
- Genus Laxispira Gabb, 1877 † (1)
- Genus Macrophragma P. P. Carpenter, 1857 accepted as Petaloconchus H. C. Lea, 1843
- Genus Magilina Vélain, 1877
- Genus Microrbis Tabanelli, 2008 † (1)
- Genus Novastoa Finlay, 1926 (6)
- Genus Petaloconchus H. C. Lea, 1843 (31)
- Genus Serpulorbis Sasso, 1827 accepted as Thylacodes Guettard, 1770
- Genus Siphonium J. E. Gray, 1850 accepted as Dendropoma Mörch, 1861
- Genus Spiroglyphus Daudin, 1800
- Genus Tetranemia Mörch, 1859 accepted as Thylacodes Guettard, 1770
- Genus Thylacodes Guettard, 1770 (55)
- Genus Thylacodus Mörch, 1860 accepted as Petaloconchus H. C. Lea, 1843
- Genus Thylaeodus Mörch, 1860 (5)
- Species Thylaeodus contortus (P. P. Carpenter, 1857)
- Species Thylaeodus equatorialis Spotorno & Simone, 2013
- Species Thylaeodus indentatus (P. P. Carpenter, 1857)
- Species Thylaeodus rugulosus (Monterosato, 1878)
- Species Thylaeodus semisurrectus (Bivona e Bernardi, 1832)
- Genus Tripsycha Keen, 1961 (1)
- Genus Tulaxoda Blainville, 1828 accepted as Thylacodes Guettard, 1770
- Genus Tulaxodus Guettard, 1770 accepted as Thylacodes Guettard, 1770
- Genus Veristoa Iredale, 1937 accepted as Dendropoma Mörch, 1861
- Genus Vermetidae incertae sedis
- Genus Vermetus Daudin, 1800 (26)
- Genus Vermiculus "Da Costa, 1776" accepted as Dofania Mörch, 1860
- Genus Vermitoma Kuroda, 1928
- Superfamily Xenophoroidea Troschel, 1852 (1840) accepted as Stromboidea Rafinesque, 1815
- Order Neogastropoda (23 716)
- Order Stenoglossa accepted as Neogastropoda
- Subclass Gastropoda incertae sedis (308)
- Subclass Heterobranchia (39 156)
- 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