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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)
- Genus Abbottella J. B. Henderson & Bartsch, 1920 (4)
- Genus Abbottipoma Watters, M. L. Smith & Sneddon, 2020 (3)
- Genus Annularella J. B. Henderson & Bartsch, 1920 accepted as Annularisca J. B. Henderson & Bartsch, 1920
- Genus Annularisca J. B. Henderson & Bartsch, 1920 (33)
- Genus Arenabbottella Watters, M. L. Smith & Sneddon, 2020 (14)
- Genus Bermudezsiphona C. de la Torre & Bartsch, 1941 accepted as Opisthosiphon Dall, 1905
- Genus Cubitasiphona C. de la Torre & Bartsch, 1941 accepted as Opisthosiphon (Opisthosiphona) J. B. Henderson & Bartsch, 1920
- Genus Cylindrosiphona C. de la Torre & Bartsch, 1941 accepted as Opisthosiphon (Opisthosiphona) J. B. Henderson & Bartsch, 1920
- Genus Lagopoma Bartsch, 1946 (1)
- Genus Leiabbottella Watters, 2010 (1)
- Genus Leptopisthosiphon Bartsch, 1946 accepted as Opisthosiphon (Opisthosiphona) J. B. Henderson & Bartsch, 1920
- Genus Meganipha F. G. Thompson, 1978 (1)
- Genus Meganiphe [sic] accepted as Meganipha F. G. Thompson, 1978
- Genus Microabbottella Watters, M. L. Smith & Sneddon, 2020 (1)
- Genus Mirisiphon C. de la Torre & Bartsch, 1941 accepted as Opisthosiphon Dall, 1905
- Genus Opisthocoelex C. de la Torre & Bartsch, 1941 accepted as Opisthosiphon (Opisthosiphona) J. B. Henderson & Bartsch, 1920
- Genus Opisthocoelicum C. de la Torre & Bartsch, 1941 accepted as Opisthosiphon (Opisthosiphona) J. B. Henderson & Bartsch, 1920
- Genus Opisthocoelops C. de la Torre & Bartsch, 1941 accepted as Opisthosiphon (Opisthosiphona) J. B. Henderson & Bartsch, 1920
- Genus Opisthosiphon Dall, 1905 (66)
- Subgenus Opisthosiphon (Bermudezsiphona) C. de la Torre & Bartsch, 1941 represented as Opisthosiphon Dall, 1905
- Species Opisthosiphon (Bermudezsiphona) aguilerianum (Arango, 1876) represented as Opisthosiphon aguilerianum (Arango, 1876)
- Species Opisthosiphon (Bermudezsiphona) andrewsi Welch, 1929 represented as Opisthosiphon andrewsi Welch, 1929
- Species Opisthosiphon (Bermudezsiphona) banaoense C. de la Torre & J. B. Henderson, 1921 represented as Opisthosiphon banaoense C. de la Torre & J. B. Henderson, 1921
- Species Opisthosiphon (Bermudezsiphona) bermudezi C. de la Torre & Bartsch, 1941 represented as Opisthosiphon bermudezi C. de la Torre & Bartsch, 1941
- Species Opisthosiphon (Bermudezsiphona) caguanense C. de la Torre & Bartsch, 1942 represented as Opisthosiphon caguanense C. de la Torre & Bartsch, 1941
- Species Opisthosiphon (Bermudezsiphona) conicus Aguayo & Sánchez Roig, 1949 represented as Opisthosiphon conicus Aguayo & Sánchez Roig, 1949
- Species Opisthosiphon (Bermudezsiphona) cucullatum C. de la Torre & Bartsch, 1942 represented as Opisthosiphon cucullatum C. de la Torre & Bartsch, 1941
- Species Opisthosiphon (Bermudezsiphona) detectum C. de la Torre & J. B. Henderson, 1921 represented as Opisthosiphon detectum C. de la Torre & J. B. Henderson, 1921
- Species Opisthosiphon (Bermudezsiphona) evanidum C. de la Torre & J. B. Henderson, 1921 represented as Opisthosiphon evanidum C. de la Torre & J. B. Henderson, 1921
- Species Opisthosiphon (Bermudezsiphona) greenfieldi C. de la Torre & Bartsch, 1942 represented as Opisthosiphon greenfieldi C. de la Torre & Bartsch, 1941
- Species Opisthosiphon (Bermudezsiphona) insulanum C. de la Torre & Bartsch, 1942 represented as Opisthosiphon insulanum C. de la Torre & Bartsch, 1942
- Species Opisthosiphon (Bermudezsiphona) insularum [sic] accepted as Opisthosiphon insulanum C. de la Torre & Bartsch, 1942
- Species Opisthosiphon (Bermudezsiphona) lamellosum C. de la Torre & Bartsch, 1941 represented as Opisthosiphon lamellosum C. de la Torre & Bartsch, 1941
- Species Opisthosiphon (Bermudezsiphona) obtectum C. de la Torre & J. B. Henderson, 1921 represented as Opisthosiphon obtectum C. de la Torre & J. B. Henderson, 1921
- Subspecies Opisthosiphon (Bermudezsiphona) obtectum guayosense C. de la Torre & Bartsch, 1941 represented as Opisthosiphon obtectum guayosense C. de la Torre & Bartsch, 1941
- Subspecies Opisthosiphon (Bermudezsiphona) obtectum obtectum C. de la Torre & J. B. Henderson, 1921 represented as Opisthosiphon obtectum obtectum C. de la Torre & J. B. Henderson, 1921
- Subspecies Opisthosiphon (Bermudezsiphona) obtectum siebaboense C. de la Torre & Bartsch, 1941 represented as Opisthosiphon obtectum seibaboense C. de la Torre & Bartsch, 1941
- Subspecies Opisthosiphon (Bermudezsiphona) obtectum tenuicostum C. de la Torre & J. B. Henderson, 1921 represented as Opisthosiphon obtectum tenuicostum C. de la Torre & J. B. Henderson, 1921
- Species Opisthosiphon (Bermudezsiphona) obturatum C. de la Torre & J. B. Henderson, 1921 represented as Opisthosiphon obturatum C. de la Torre & J. B. Henderson, 1921
- Species Opisthosiphon (Bermudezsiphona) palmeri C. de la Torre & Bartsch, 1941 represented as Opisthosiphon palmeri C. de la Torre & Bartsch, 1941
- Species Opisthosiphon (Bermudezsiphona) plateroense C. de la Torre & Bartsch, 1941 represented as Opisthosiphon plateroense C. de la Torre & Bartsch, 1941
- Species Opisthosiphon (Bermudezsiphona) prominulum C. de la Torre & Bartsch, 1941 represented as Opisthosiphon prominulum C. de la Torre & Bartsch, 1941
- Species Opisthosiphon (Bermudezsiphona) salustii C. de la Torre & J. B. Henderson, 1921 represented as Opisthosiphon salustii C. de la Torre & J. B. Henderson, 1921
- Species Opisthosiphon (Bermudezsiphona) subobtectum C. de la Torre & Bartsch, 1941 represented as Opisthosiphon subobtectum C. de la Torre & Bartsch, 1941
- Subgenus Opisthosiphon (Cubitasiphona) C. de la Torre & Bartsch, 1941 accepted as Opisthosiphon (Opisthosiphona) J. B. Henderson & Bartsch, 1920
- Subgenus Opisthosiphon (Cylindrosiphona) C. de la Torre & Bartsch, 1941 accepted as Opisthosiphon (Opisthosiphona) J. B. Henderson & Bartsch, 1920
- Subgenus Opisthosiphon (Leptopisthosiphon) Bartsch, 1946 represented as Opisthosiphon Dall, 1905
- Subgenus Opisthosiphon (Mirisiphon) C. de la Torre & Bartsch, 1941 accepted as Opisthosiphon (Opisthosiphon) Dall, 1905
- Subgenus Opisthosiphon (Opisthosiphon) Dall, 1905 represented as Opisthosiphon Dall, 1905
- Subgenus Opisthosiphon (Opisthosiphona) J. B. Henderson & Bartsch, 1920 represented as Opisthosiphon Dall, 1905
- Subgenus Opisthosiphon (Solutapex) C. de la Torre & Bartsch, 1941 represented as Opisthosiphon Dall, 1905
- Species Opisthosiphon acklinsensis Bartsch, 1946
- Species Opisthosiphon aguilerianum (Arango, 1876)
- Species Opisthosiphon alleni Bartsch, 1946
- Species Opisthosiphon andrewsi Welch, 1929
- Species Opisthosiphon androsensis Pilsbry, 1930
- Species Opisthosiphon apertum C. de la Torre & J. B. Henderson, 1921
- Species Opisthosiphon bacillum C. de la Torre & Bartsch, 1941
- Species Opisthosiphon bahamensis (L. Pfeiffer, 1865)
- Species Opisthosiphon banaoense C. de la Torre & J. B. Henderson, 1921
- Species Opisthosiphon bermudezi C. de la Torre & Bartsch, 1941
- Species Opisthosiphon berryi W. F. Clapp, 1919
- Species Opisthosiphon bioscai C. de la Torre & J. B. Henderson, 1921
- Species Opisthosiphon caguanense C. de la Torre & Bartsch, 1941
- Species Opisthosiphon caroli Aguayo, 1932
- Species Opisthosiphon claudens C. de la Torre & Bartsch, 1941
- Species Opisthosiphon conicus Aguayo & Sánchez Roig, 1949
- Species Opisthosiphon cucullatum C. de la Torre & Bartsch, 1941
- Species Opisthosiphon cunaguae Welch, 1929
- Species Opisthosiphon dalli C. de la Torre & J. B. Henderson, 1920 accepted as Dallsiphona dalli (C. de la Torre & J. B. Henderson, 1920)
- Species Opisthosiphon detectum C. de la Torre & J. B. Henderson, 1921
- Species Opisthosiphon deviatum C. de la Torre & Bartsch, 1941
- Species Opisthosiphon dubium (Sánchez Roig, 1951)
- Species Opisthosiphon echinatum (L. Pfeiffer, 1857)
- Species Opisthosiphon evanidum C. de la Torre & J. B. Henderson, 1921
- Species Opisthosiphon excurrens (L. Pfeiffer & Gundlach, 1860)
- Species Opisthosiphon greenfieldi C. de la Torre & Bartsch, 1941
- Species Opisthosiphon guanajaense C. de la Torre & Bartsch, 1941
- Species Opisthosiphon insulanum C. de la Torre & Bartsch, 1942
- Species Opisthosiphon insularum [sic] accepted as Opisthosiphon insulanum C. de la Torre & Bartsch, 1942
- Species Opisthosiphon judasense C. de la Torre & J. B. Henderson, 1921
- Species Opisthosiphon lamellicostatum C. de la Torre & J. B. Henderson, 1921
- Species Opisthosiphon lamellosum C. de la Torre & Bartsch, 1941
- Species Opisthosiphon litorale C. de la Torre & Bartsch, 1941
- Species Opisthosiphon lucayanorus Clench, 1963
- Species Opisthosiphon manatiense C. de la Torre & Bartsch, 1941
- Species Opisthosiphon maynardi Vanatta, 1920
- Species Opisthosiphon mayori Bartsch, 1946
- Species Opisthosiphon millsi Bartsch, 1946
- Species Opisthosiphon moreletianum (Petit de la Saussaye, 1850)
- Species Opisthosiphon nicholasi Bartsch, 1946
- Species Opisthosiphon obtectum C. de la Torre & J. B. Henderson, 1921
- Species Opisthosiphon obturatum C. de la Torre & J. B. Henderson, 1921
- Species Opisthosiphon occultum C. de la Torre & J. B. Henderson, 1921
- Species Opisthosiphon opisthocoele (C. de la Torre & Bartsch, 1941)
- Species Opisthosiphon palmeri C. de la Torre & Bartsch, 1941
- Species Opisthosiphon paradoxum (C. de la Torre & J. B. Henderson, 1921)
- Species Opisthosiphon paredonense C. de la Torre & J. B. Henderson, 1921
- Species Opisthosiphon plateroense C. de la Torre & Bartsch, 1941
- Species Opisthosiphon plicatum C. de la Torre & Bartsch, 1941
- Species Opisthosiphon poeyi C. de la Torre & Bartsch, 1941
- Species Opisthosiphon prominulum C. de la Torre & Bartsch, 1941
- Species Opisthosiphon protractum C. de la Torre & J. B. Henderson, 1921
- Species Opisthosiphon pupoides (Morelet, 1849)
- Species Opisthosiphon quesadai Aguayo, 1932
- Species Opisthosiphon quinti C. de la Torre & Bartsch, 1941
- Species Opisthosiphon rivorum Aguayo, 1932 accepted as Opisthosiphon caroli Aguayo, 1932
- Species Opisthosiphon sainzi Aguayo, 1934
- Species Opisthosiphon salustii C. de la Torre & J. B. Henderson, 1921
- Species Opisthosiphon sanchezi C. de la Torre & Bartsch, 1941
- Species Opisthosiphon sculptum (L. Pfeiffer, 1857)
- Species Opisthosiphon simpsoni Bartsch, 1946
- Species Opisthosiphon simulans (C. de la Torre & Bartsch, 1941)
- Species Opisthosiphon sosai C. de la Torre & Bartsch, 1941
- Species Opisthosiphon subobtectum C. de la Torre & Bartsch, 1941
- Species Opisthosiphon subobturatum C. de la Torre & J. B. Henderson, 1921
- Species Opisthosiphon tersum C. de la Torre & J. B. Henderson, 1921
- Species Opisthosiphon thesaurus Watters, 2019
- Species Opisthosiphon torrei Welch, 1929
- Species Opisthosiphon turiguanoense C. de la Torre & Bartsch, 1941
- Genus Petasipoma Bartsch, 1946 accepted as Rolleia Crosse, 1891
- Genus Preclaripoma Watters, M. L. Smith & Sneddon, 2020 (2)
- Genus Rolleia Crosse, 1891 (6)
- Subfamily Annulariinae J. B. Henderson & Bartsch, 1920 (84)
- 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
