Between brackets is the number of accepted species
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- Mollusca (130 773)
- Subphylum Aculifera
- Subphylum Conchifera
- Subphylum Placophora accepted as Polyplacophora
- Superclass Aplacophora
- Class Amphineura accepted as Aculifera
- Class Bivalvia (24 119)
- Class Caudofoveata (143)
- Class Cephalopoda (1 765)
- Class Conchifera accepted as Bivalvia
- Class Cricoconarida †
- Class Gastropoda (101 657)
- Subclass Amphigastropoda † (360)
- Subclass Angiogastropoda represented as Gastropoda
- Subclass Apogastropoda
- Subclass Caenogastropoda (52 838)
- Subterclass Sorbeoconcha (146)
- Superorder Hypsogastropoda
- Order Architaenioglossa (4 911)
- Order Caenogastropoda incertae sedis (7 638)
- Order Littorinimorpha (17 025)
- Superfamily Calyptraeoidea Lamarck, 1809 (202)
- 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 (1 175)
- 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 (98)
- Superfamily Littorinoidea Children, 1834 (1 364)
- Family Annulariidae J. B. Henderson & Bartsch, 1920 (710)
- Subfamily Abbottellinae Watters, 2016 (130)
- Subfamily Annulariinae J. B. Henderson & Bartsch, 1920 (84)
- Subfamily Chondropomatinae J. B. Henderson & Bartsch, 1920 (263)
- Genus Aguayotudora C. de la Torre & Bartsch, 1941 (12)
- Genus Annularodes J. B. Henderson & Bartsch, 1920 (8)
- Genus Bonairea H. B. Baker, 1924 (1)
- Genus Chondropoma L. Pfeiffer, 1847 (72)
- Genus Chondropomatus J. B. Henderson & Bartsch, 1920 (2)
- Genus Chondropomisca C. de la Torre & Bartsch, 1938 accepted as Chondropoma L. Pfeiffer, 1847
- Genus Chondropomodes C. de la Torre & Bartsch, 1938 represented as Chondropoma L. Pfeiffer, 1847
- Genus Chondropomorus J. B. Henderson & Bartsch, 1920 accepted as Parachondria Dall, 1905
- Genus Chondrops Bartsch, 1946 (3)
- Genus Chondrothyrium J. B. Henderson & Bartsch, 1920 (7)
- Genus Cistula Gray, 1850 accepted as Parachondria Dall, 1905
- Genus Colobostyloides Bartsch, 1946 accepted as Colonina Bartsch, 1946
- Genus Colonella Bartsch, 1946 (3)
- Genus Crossepoma Bartsch, 1946 (8)
- Genus Ctenopoma L. Pfeiffer, 1856 accepted as Rhytidopoma Sykes, 1901
- Genus Cubadamsiella C. de la Torre & Bartsch, 1941 (5)
- Genus Diploma [sic] accepted as Diplopoma L. Pfeiffer, 1859
- Genus Diplopoma L. Pfeiffer, 1859 (39)
- Genus Eutudorex C. de la Torre & Bartsch, 1941 accepted as Ramsdenia Preston, 1913
- Genus Jaumeia Aguayo, 1943 accepted as Ramsdenia Preston, 1913
- Genus Klattea Bartsch, 1946 accepted as Crossepoma Bartsch, 1946
- Genus Levipoma Bartsch, 1946 accepted as Chondropoma L. Pfeiffer, 1847
- Genus Limadora C. de la Torre & Bartsch, 1941 accepted as Ramsdenia Preston, 1913
- Genus Limadorex C. de la Torre & Bartsch, 1941 accepted as Ramsdenia Preston, 1913
- Genus Lindenipoma Bartsch, 1946 accepted as Parachondria Dall, 1905
- Genus Orcuttipoma Bartsch, 1946 accepted as Parachondria Dall, 1905
- Genus Parachondrella J. B. Henderson & Bartsch, 1920 accepted as Parachondria Dall, 1905
- Genus Parachondria Dall, 1905 (66)
- Subgenus Parachondria (Chondropomorus) J. B. Henderson & Bartsch, 1920 represented as Parachondria Dall, 1905
- Subgenus Parachondria (Clenchipoma) Bartsch, 1946 represented as Parachondria Dall, 1905
- Subgenus Parachondria (Clydonopoma) Pilsbry, 1933 accepted as Clydonopoma Pilsbry, 1933
- Subgenus Parachondria (Eccritopoma) Pilsbry, 1933 accepted as Clydonopoma Pilsbry, 1933
- Subgenus Parachondria (Parachondrella) J. B. Henderson & Bartsch, 1920 represented as Parachondria Dall, 1905
- Subgenus Parachondria (Parachondria) Dall, 1905 represented as Parachondria Dall, 1905
- Subgenus Parachondria (Parachondrisca) J. B. Henderson & Bartsch, 1920 accepted as Parachondria Dall, 1905
- Subgenus Parachondria (Parachondrops) J. B. Henderson & Bartsch, 1920 accepted as Parachondrops J. B. Henderson & Bartsch, 1920
- Species Parachondria abnata (L. Pfeiffer, 1858)
- Species Parachondria adamsi (L. Pfeiffer, 1846)
- Species Parachondria adulterina (L. Pfeiffer, 1858)
- Species Parachondria anatolensis Watters, 2016
- Species Parachondria arcisensis Watters, 2016
- Species Parachondria armata (C. B. Adams, 1849)
- Species Parachondria auberiana (A. d'Orbigny, 1842)
- Species Parachondria aurora (C. B. Adams, 1849)
- Species Parachondria avena (C. B. Adams, 1849)
- Species Parachondria barklyana (Chitty, 1853)
- Species Parachondria basicarinata (L. Pfeiffer, 1855)
- Species Parachondria basicarinatus (L. Pfeiffer, 1855) accepted as Parachondria basicarinata (L. Pfeiffer, 1855)
- Species Parachondria blauneri (Shuttleworth, 1854)
- Species Parachondria canescens (L. Pfeiffer, 1852)
- Species Parachondria caricae (L. Pfeiffer, 1858)
- Species Parachondria chordata (L. Pfeiffer, 1858)
- Species Parachondria clenchi (Bartsch, 1946)
- Species Parachondria columna (W. Wood, 1828)
- Species Parachondria consepta (E. von Martens, 1883)
- Species Parachondria conseptus (E. von Martens, 1883) accepted as Parachondria consepta (E. von Martens, 1883)
- Species Parachondria cordovana (L. Pfeiffer, 1857)
- Species Parachondria cordovanus (L. Pfeiffer, 1857) accepted as Parachondria cordovana (L. Pfeiffer, 1857)
- Species Parachondria coroni (Bartsch, 1946)
- Species Parachondria crenulosa (C. B. Adams, 1849)
- Species Parachondria daedala Watters, 2016
- Species Parachondria darlingtoni Clench & Aguayo, 1937
- Species Parachondria decussata (Lamarck, 1822) accepted as Diplopoma decussatum (Lamarck, 1822)
- Species Parachondria decussatus (Lamarck, 1822) accepted as Diplopoma decussatum (Lamarck, 1822)
- Species Parachondria delatreana (A. d'Orbigny, 1842)
- Species Parachondria dentata (Say, 1825)
- Species Parachondria dessalinesi (Bartsch, 1946)
- Species Parachondria dilatata (L. Pfeiffer, 1859)
- Species Parachondria fascia (W. Wood, 1828)
- Species Parachondria fecunda (C. B. Adams, 1849)
- Species Parachondria fraterminor (Pilsbry & A. P. Brown, 1910) accepted as Parachondria avena (C. B. Adams, 1849)
- Species Parachondria gettlemani Watters, 2012
- Species Parachondria gnota (Pilsbry, 1935)
- Species Parachondria gonavensis (Bartsch, 1946)
- Species Parachondria graminosa (H. B. Baker, 1941)
- Species Parachondria graminosus (H. B. Baker, 1941) accepted as Parachondria graminosa (H. B. Baker, 1941)
- Species Parachondria griffithiana (C. B. Adams, 1850)
- Species Parachondria heatheraikenae Watters, 2016
- Species Parachondria hispaniolae (Clench & Aguayo, 1937)
- Species Parachondria holguinensis Aguayo, 1944 accepted as Chondropoma holguinense (Aguayo, 1944)
- Species Parachondria isabellina Watters, 2016
- Species Parachondria joyeuse Watters, 2016
- Species Parachondria kazika (Bartsch, 1946)
- Species Parachondria lindeniana (Weinland, 1880)
- Species Parachondria lineolata (Lamarck, 1822)
- Species Parachondria maritima (C. B. Adams, 1846)
- Species Parachondria mordax (C. B. Adams, 1849)
- Species Parachondria muchai Watters, 2016
- Species Parachondria mutica (C. B. Adams, 1849)
- Species Parachondria olssoni (Pilsbry, 1933)
- Species Parachondria orcutti (Bartsch, 1946)
- Species Parachondria papyracea (C. B. Adams, 1850)
- Species Parachondria pauperata (C. B. Adams, 1849)
- Species Parachondria petitiana (L. Pfeiffer, 1850)
- Species Parachondria pfeifferi Aguayo, 1945 accepted as Chondropoma pfeifferi (Aguayo, 1945)
- Species Parachondria pilsbryi (Bartsch, 1946)
- Species Parachondria pupiformis (G. B. Sowerby I, 1843) accepted as Chondropoma pupiforme (G. B. Sowerby I, 1843)
- Species Parachondria pyrostoma Pilsbry, 1930
- Species Parachondria revincta (Poey, 1851)
- Species Parachondria riisei (L. Pfeiffer, 1852)
- Species Parachondria rubicunda (Morelet, 1849) accepted as Gouldipoma rubicundum (Morelet, 1849)
- Species Parachondria rubicundus (Morelet, 1849) accepted as Parachondria rubicunda (Morelet, 1849)
- Species Parachondria salleana (L. Pfeiffer, 1850)
- Species Parachondria samanicola (Bartsch, 1946) accepted as Diplopoma samanicolum (Bartsch, 1946)
- Species Parachondria santacruzensis (L. Pfeiffer, 1855)
- Species Parachondria scripturatum (Weinland, 1876)
- Species Parachondria sericina (C. B. Adams, 1851)
- Species Parachondria silvatica Watters, 2016
- Species Parachondria simulans (C. B. Adams, 1851)
- Species Parachondria stigmosa Watters, 2016
- Species Parachondria stigmosus Watters, 2016 accepted as Parachondria stigmosa Watters, 2016
- Species Parachondria tappaniana (C. B. Adams, 1851)
- Species Parachondria texta (L. Pfeiffer, 1858)
- Subspecies Parachondria texta booneae (Welch, 1934)
- Subspecies Parachondria texta portillensis C. de la Torre & Bartsch, 1941
- Subspecies Parachondria texta texta (L. Pfeiffer, 1858)
- Species Parachondria trachyderma (Pilsbry, 1933)
- Species Parachondria umbricola (Weinland, 1862)
- Species Parachondria yunquei (H. B. Baker, 1941)
- Genus Parachondrisca J. B. Henderson & Bartsch, 1920 accepted as Parachondria Dall, 1905
- Genus Parachondrodes Clench & Aguayo, 1946 accepted as Parachondria Dall, 1905
- Genus Parachondrops J. B. Henderson & Bartsch, 1920 (9)
- Genus Plicathyrium Jaume & Sánchez de Fuentes, 1943 accepted as Chondrothyrium J. B. Henderson & Bartsch, 1920
- Genus Rhytidopoma Sykes, 1901 (18)
- Genus Rhytidothyra J. B. Henderson & Bartsch, 1920 (2)
- Genus Subannularia C. de la Torre & Bartsch, 1941 (8)
- Genus Torrella J. B. Henderson & Bartsch, 1920 accepted as Rhytidopoma Sykes, 1901
- Genus Torrellisca J. B. Henderson & Bartsch, 1920 accepted as Rhytidopoma Sykes, 1901
- Genus Troschelvindex H. B. Baker, 1924 accepted as Diplopoma (Troschelvindex) H. B. Baker, 1924
- Genus Wrightudora C. de la Torre & Bartsch, 1941 accepted as Ramsdenia Preston, 1913
- Subfamily Licininae J. E. Gray, 1857 accepted as Tudorinae Watters, 2006
- Subfamily Rhytidopomatinae J. B. Henderson & Bartsch, 1920 (46)
- Subfamily Tudorinae Watters, 2006 (183)
- 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 (303)
- 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 (687)
- 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 (2 307)
- Superfamily Stromboidea Rafinesque, 1815 (822)
- Superfamily Tonnoidea Suter, 1913 (1825) (786)
- Superfamily Truncatelloidea J. E. Gray, 1840 (6 892)
- Superfamily Vanikoroidea Gray, 1840 (1 331)
- Superfamily Velutinoidea Gray, 1840 (644)
- Superfamily Vermetoidea Rafinesque, 1815 (172)
- Superfamily Xenophoroidea Troschel, 1852 (1840) accepted as Stromboidea Rafinesque, 1815
- Order Neogastropoda (23 118)
- Order Stenoglossa accepted as Neogastropoda
- Subclass Gastropoda incertae sedis (256)
- Subclass Heterobranchia (39 082)
- Subclass Neomphaliones (132)
- Subclass Neritimorpha (1 891)
- Subclass Orthogastropoda represented as Gastropoda
- Subclass Patellogastropoda (510)
- Subclass Prosobranchia
- Subclass Psilogastropoda represented as Gastropoda
- Subclass Vetigastropoda (6 588)
- Class Lamellibranchiata accepted as Bivalvia
- Class Loricata accepted as Polyplacophora
- Class Mollusca incertae sedis † (360)
- Class Monoplacophora (228)
- Class Pelecypoda accepted as Bivalvia
- Class Polyplacophora (1 378)
- Class Polyplaxiphora accepted as Polyplacophora
- Class Rostroconchia † (58)
- Class Scaphopoda (752)
- Class Solenoconchia accepted as Scaphopoda
- Class Solenogastres (313)
- Subclass Chaetodermomorpha accepted as Caudofoveata