Between brackets is the number of accepted species
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- Mollusca (132 851)
- Subphylum Aculifera
- Subphylum Conchifera
- Subphylum Placophora accepted as Polyplacophora
- Superclass Aplacophora
- Class Amphineura accepted as Aculifera
- Class Bivalvia (25 013)
- Class Caudofoveata (143)
- Class Cephalopoda (1 834)
- Class Conchifera accepted as Bivalvia
- Class Cricoconarida † (1)
- Class Gastropoda (102 753)
- Subclass Amphigastropoda † (396)
- Subclass Angiogastropoda represented as Gastropoda
- Subclass Apogastropoda
- Subclass Caenogastropoda (53 670)
- Subterclass Sorbeoconcha (147)
- Superorder Hypsogastropoda
- Order Architaenioglossa (4 919)
- Order Caenogastropoda incertae sedis (7 677)
- Order Littorinimorpha (17 189)
- 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 (1 294)
- 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)
- Family Annulariidae J. B. Henderson & Bartsch, 1920 (716)
- Subfamily Abbottellinae Watters, 2016 (132)
- Subfamily Annulariinae J. B. Henderson & Bartsch, 1920 (84)
- Genus Adamsiella L. Pfeiffer, 1851 (9)
- Genus Annularia Schumacher, 1817 (15)
- Subgenus Annularia (Annularella) J. B. Henderson & Bartsch, 1920 accepted as Annularisca J. B. Henderson & Bartsch, 1920
- Subgenus Annularia (Annularex) C. de la Torre & Bartsch, 1941 accepted as Annularisca J. B. Henderson & Bartsch, 1920
- Species Annularia (Annularex) incerta C. de la Torre & Bartsch, 1941 accepted as Annularisca incerta (C. de la Torre & Bartsch, 1941)
- Species Annularia (Annularex) intercisa C. de la Torre & Bartsch, 1941 accepted as Annularisca intercisa (C. de la Torre & Bartsch, 1941)
- Subgenus Annularia (Annularia) Schumacher, 1817 represented as Annularia Schumacher, 1817
- Subgenus Annularia (Annularisca) J. B. Henderson & Bartsch, 1920 accepted as Annularisca J. B. Henderson & Bartsch, 1920
- Subgenus Annularia (Annularita) J. B. Henderson & Bartsch, 1920 accepted as Annularita J. B. Henderson & Bartsch, 1920
- Subgenus Annularia (Annularodella) C. de la Torre & Bartsch, 1941 accepted as Eutudora (Annularodella) C. de la Torre & Bartsch, 1941
- Subgenus Annularia (Annularodes) J. B. Henderson & Bartsch, 1920 accepted as Annularodes J. B. Henderson & Bartsch, 1920
- Subgenus Annularia (Annularodisca) C. de la Torre & Bartsch, 1941 accepted as Annularodes J. B. Henderson & Bartsch, 1920
- Subgenus Annularia (Annularops) J. B. Henderson & Bartsch, 1920 accepted as Annularops J. B. Henderson & Bartsch, 1920
- Subgenus Annularia (Annularosa) J. B. Henderson & Bartsch, 1920 accepted as Annularisca (Annularosa) J. B. Henderson & Bartsch, 1920
- Subgenus Annularia (Bermudezia) C. de la Torre & Bartsch, 1941 represented as Bermudezia C. de la Torre & Bartsch, 1941
- Subgenus Annularia (Blaesospira) Crosse, 1891 represented as Blaesospira Crosse, 1891
- Subgenus Annularia (Chondropomatus) C. de la Torre & Bartsch, 1941 accepted as Chondropomatus J. B. Henderson & Bartsch, 1920
- Subgenus Annularia (Diplopoma) L. Pfeiffer, 1859 accepted as Diplopoma L. Pfeiffer, 1859
- Subgenus Annularia (Eutudora) J. B. Henderson & Bartsch, 1920 accepted as Eutudora J. B. Henderson & Bartsch, 1920
- Subgenus Annularia (Eutudorisca) J. B. Henderson & Bartsch, 1920 accepted as Eutudorisca J. B. Henderson & Bartsch, 1920
- Subgenus Annularia (Fossularia) C. de la Torre & Bartsch, 1941 accepted as Eutudora (Annularodella) C. de la Torre & Bartsch, 1941
- Subgenus Annularia (Jamaicia) C. B. Adams, 1850 represented as Annularia Schumacher, 1817
- Subgenus Annularia (Juannularia) C. de la Torre & Bartsch, 1941 accepted as Juannularia C. de la Torre & Bartsch, 1941
- Subgenus Annularia (Lugarenia) C. de la Torre & Bartsch, 1941 accepted as Bermudezia C. de la Torre & Bartsch, 1941
- Subgenus Annularia (Subannularia) C. de la Torre & Bartsch, 1941 accepted as Subannularia C. de la Torre & Bartsch, 1941
- Subgenus Annularia (Troschelvindex) H. B. Baker, 1924 accepted as Diplopoma (Troschelvindex) H. B. Baker, 1924
- Species Annularia anomala (C. B. Adams, 1850)
- Species Annularia aurantiaca Schumacher, 1817 accepted as Cyclophorus aurantiacus (Schumacher, 1817)
- Species Annularia barbouri C. de la Torre & Bartsch, 1941 accepted as Diplopoma barbouri (C. de la Torre & Bartsch, 1941)
- Species Annularia barkeri F. Haas, 1951 accepted as Halotudora barkeri (F. Haas, 1951)
- Species Annularia bermudezi C. de la Torre & Bartsch, 1941
- Species Annularia boqueronensis C. de la Torre & Bartsch, 1941 accepted as Eutudora boqueronensis (C. de la Torre & Bartsch, 1941)
- Species Annularia chittyi (C. B. Adams, 1849)
- Species Annularia eburnea (L. Pfeiffer, 1858) accepted as Annularisca eburnea (L. Pfeiffer, 1858)
- Species Annularia fimbriata Schumacher, 1817 accepted as Annularia lincina (Linnaeus, 1758)
- Species Annularia fimbriatula (G. B. Sowerby I, 1825)
- Species Annularia hendersoni C. de la Torre & Bartsch, 1941 accepted as Annularisca hendersoni (C. de la Torre & Bartsch, 1941)
- Species Annularia hilliana (C. B. Adams, 1845)
- Species Annularia holguinensis C. de la Torre & Bartsch, 1941 accepted as Annularisca holguinensis (C. de la Torre & Bartsch, 1941)
- Species Annularia indivisa (Welch, 1929) accepted as Annularodes indivisus (Welch, 1929)
- Species Annularia inquisita (Pilsbry, 1929) accepted as Eutudora inquisita (Pilsbry, 1929)
- Species Annularia lima (C. B. Adams, 1845)
- Species Annularia lincina (Linnaeus, 1758)
- Species Annularia mayensis C. de la Torre & Ramsden, 1914 accepted as Annularisca mayensis (C. de la Torre & Ramsden, 1914)
- Species Annularia mitis (L. Pfeiffer, 1854)
- Species Annularia morenoi C. de la Torre & Bartsch, 1941 accepted as Eutudora morenoi (C. de la Torre & Bartsch, 1941)
- Species Annularia moussoniana (C. B. Adams, 1851)
- Species Annularia occidentale (L. Pfeiffer, 1861) accepted as Diplopoma crenulatum (Potiez & Michaud, 1838)
- Species Annularia pisum (C. B. Adams, 1849)
- Species Annularia pseudalatum Pilsbry & J. B. Henderson, 1912 accepted as Annularisca pseudalata (Pilsbry & J. B. Henderson, 1912)
- Species Annularia pulchra (W. Wood, 1828) accepted as Annularia rosenbergi Bank & Menkhorst, 2008
- Species Annularia ramsdeni Pilsbry & J. B. Henderson, 1912 accepted as Annularisca ramsdeni (Pilsbry & J. B. Henderson, 1912)
- Species Annularia retrorsa (C. B. Adams, 1850)
- Species Annularia rocai C. de la Torre & Bartsch, 1941 accepted as Blaesospira rocai (C. de la Torre & Bartsch, 1941)
- Species Annularia rosenbergi Bank & Menkhorst, 2008
- Species Annularia rosenbergianum (Preston, 1911) accepted as Tudorisca rosenbergiana (Preston, 1911)
- Species Annularia scabricula (G. B. Sowerby I, 1843)
- Species Annularia spinulosa (C. B. Adams, 1849)
- Species Annularia spurca Aguayo, 1934 represented as Annularops coronadoi spurcus (Aguayo, 1934)
- Species Annularia sumichrasti Crosse & P. Fischer, 1874 accepted as Gouldipoma sumichrasti (Crosse & P. Fischer, 1874)
- Species Annularia triplopoma (H. B. Baker, 1934)
- Genus Annularops J. B. Henderson & Bartsch, 1920 (9)
- Genus Bermudezia C. de la Torre & Bartsch, 1941 (10)
- Genus Blaesospira Crosse, 1891 (3)
- Genus Chittypoma Watters, 2006 (4)
- Genus Choanopoma L. Pfeiffer, 1847 accepted as Annularia Schumacher, 1817
- Genus Christophipoma Bartsch, 1946 accepted as Eyerdamia Bartsch, 1946
- Genus Cistulops H. B. Baker, 1924 (1)
- Genus Eyerdamia Bartsch, 1946 (3)
- Genus Juannularia C. de la Torre & Bartsch, 1941 (2)
- Genus Megannularia Watters, 2006
- Genus Saulaepoma Watters, 2006 (1)
- Genus Weinlandipoma Bartsch, 1946 (21)
- Genus Xenopoma Crosse, 1891 (5)
- Genus Xenopomoides C. de la Torre & Bartsch, 1941 (1)
- Subfamily Chondropomatinae J. B. Henderson & Bartsch, 1920 (263)
- Subfamily Licininae J. E. Gray, 1857 accepted as Tudorinae Watters, 2006
- Subfamily Rhytidopomatinae J. B. Henderson & Bartsch, 1920 (46)
- Subfamily Tudorinae Watters, 2006 (187)
- Genus Incertipoma Bartsch, 1946 (1)
- Genus Tessaripoma Watters, 2016 (3)
- Family Bembiciidae H. J. Finlay, 1928 accepted as Lacuninae Gray, 1857
- Family Bohaispiridae B.-Y. Huang, 1983 † (35)
- Family Cyclostomatidae Menke, 1828 accepted as Pomatiidae R. B. Newton, 1891 (1828)
- Family Ericiidae Wenz, 1915 accepted as Pomatiidae R. B. Newton, 1891 (1828)
- Family Lacunidae Gray, 1857 accepted as Littorinidae Children, 1834
- Family Leviathaniidae Harzhauser & S. Schneider, 2014 † (7)
- Family Littorinidae Children, 1834 (305)
- Family Melarhaphidae Starobogatov & Sitnikova, 1983 accepted as Littorininae Children, 1834
- Family Pomatiidae R. B. Newton, 1891 (1828) (281)
- Family Purpuroideidae Guzhov, 2004 † (7)
- Family Risellidae Kesteven, 1903 accepted as Lacuninae Gray, 1857
- Family Skeneopsidae Iredale, 1915 (4)
- Family Tripartellidae Gründel, 2001 †
- Family Zerotulidae Warén & Hain, 1996 (17)
- 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 (2 312)
- 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)
- Superfamily Xenophoroidea Troschel, 1852 (1840) accepted as Stromboidea Rafinesque, 1815
- Order Neogastropoda (23 738)
- Order Stenoglossa accepted as Neogastropoda
- Subclass Gastropoda incertae sedis (308)
- Subclass Heterobranchia (39 172)
- 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
