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)
- Superfamily Ampullarioidea Gray, 1824 (250)
- Superfamily Cyclophoroidea J. E. Gray, 1847 (3 905)
- Family Aciculidae J. E. Gray, 1850 (104)
- Family Acmeidae Pollonera, 1905 accepted as Aciculidae J. E. Gray, 1850
- Family Alycaeidae W. T. Blanford, 1864 accepted as Alycaeinae W. T. Blanford, 1864
- Family Bolaniidae Wenz, 1915 accepted as Craspedopomatidae Kobelt & Möllendorff, 1898
- Family Cochlostomatidae Kobelt, 1902 (118)
- Family Craspedopomatidae Kobelt & Möllendorff, 1898 (21)
- Family Cyclophoridae J. E. Gray, 1847 (1 604)
- Family Cytoridae Climo, 1969 accepted as Liareinae A. W. B. Powell, 1946
- Family Dicristidae A. N. Golikov & Starobogatov, 1975 accepted as Neocyclotidae Kobelt & Möllendorff, 1897
- Family Diplommatinidae L. Pfeiffer, 1856 (1 026)
- Family Ferussinidae Wenz, 1923 (1915) † accepted as Ferussininae Wenz, 1923 (1915) †
- Family Hainesiidae Thiele, 1929 (220)
- Family Lagocheilidae Stoliczka, 1872 accepted as Cyclophoridae J. E. Gray, 1847
- Family Maizaniidae Tielecke, 1940 (40)
- Family Megalomastomatidae W. T. Blanford, 1864 (100)
- Family Megalostomatidae [sic] accepted as Megalomastomatidae W. T. Blanford, 1864
- Family Neocyclotidae Kobelt & Möllendorff, 1897 (242)
- Subfamily Amphicyclotinae Kobelt & Möllendorff, 1897 (49)
- Subfamily Crocidopomatinae F. G. Thompson, 1967 accepted as Neocyclotinae Kobelt & Möllendorff, 1897
- Subfamily Crocidopominae F. G. Thompson, 1967 accepted as Neocyclotinae Kobelt & Möllendorff, 1897
- Subfamily Neocyclotinae Kobelt & Möllendorff, 1897 (157)
- Genus Calaperostoma Pilsbry, 1935 (13)
- Genus Crocidopoma Shuttleworth, 1856 (7)
- Genus Cyclobakeria Bartsch, 1942 (5)
- Genus Cyclocubana C. de la Torre & Bartsch, 1942 (2)
- Genus Dicrista F. G. Thompson, 1969 (7)
- Genus Fijiopoma Clench, 1949 (1)
- Genus Gassiesia Clench, 1949 (5)
- Genus Gonatorhaphe Möllendorff, 1898 (3)
- Genus Incidostoma Bartsch & J. P. E. Morrison, 1942 (39)
- Genus Kondorhaphe Clench, 1949 (1)
- Genus Lithacaspis F. G. Thompson, 1967 (1)
- Genus Mexcyclotus Bartsch & J. P. E. Morrison, 1942 (1)
- Genus Neocyclotus Crosse & P. Fischer, 1886 (28)
- Subgenus Neocyclotus (Cyclohidalgoa) Bartsch, 1942 accepted as Neocyclotus Crosse & P. Fischer, 1886
- Subgenus Neocyclotus (Incidostoma) Bartsch & J. P. E. Morrison, 1942 accepted as Incidostoma Bartsch & J. P. E. Morrison, 1942
- Subgenus Neocyclotus (Neocyclotus) Crosse & P. Fischer, 1886 represented as Neocyclotus Crosse & P. Fischer, 1886
- Subgenus Neocyclotus (Plectocyclotus) Kobelt & Möllendorff, 1899 represented as Neocyclotus Crosse & P. Fischer, 1886
- Subgenus Neocyclotus (Ptychocochlis) C. T. Simpson, 1895 accepted as Poteria J. E. Gray, 1850
- Species Neocyclotus (Ptychocochlis) bakeri C. T. Simpson, 1895 † accepted as Incerticyclus bakeri (C. T. Simpson, 1895) †
- Species Neocyclotus agassizi (Bartsch & J. P. E. Morrison, 1942)
- Species Neocyclotus aulari (H. B. Baker, 1923)
- Species Neocyclotus bartletti (H. Adams, 1870) accepted as Lagocyclus bartletti (H. Adams, 1870)
- Species Neocyclotus belli R. H. Beddome, 1908 accepted as Aperostoma belli (R. H. Beddome, 1908)
- Species Neocyclotus beswicki (Chitty, 1857) accepted as Cyclopilsbrya beswicki (Chitty, 1857)
- Species Neocyclotus bisinuatus (E. von Martens, 1864)
- Species Neocyclotus bogotensis (L. Pfeiffer, 1855) accepted as Aperostoma bogotense (L. Pfeiffer, 1855)
- Species Neocyclotus boucardi (Angas, 1878) accepted as Barbacyclus boucardi (Angas, 1878)
- Species Neocyclotus burringtoni (Bartsch & J. P. E. Morrison, 1942)
- Species Neocyclotus capscelius F. G. Thompson, 1969
- Species Neocyclotus carabobensis (Bartsch & J. P. E. Morrison, 1942)
- Species Neocyclotus caucaensis S. I. Da Costa, 1901 accepted as Aperostoma caucaense (S. I. Da Costa, 1901)
- Species Neocyclotus cayennensis (Shuttleworth, 1852)
- Species Neocyclotus chrysacme (Bartsch & J. P. E. Morrison, 1942)
- Species Neocyclotus cingulatus (G. B. Sowerby I, 1843) accepted as Aperostoma cingulatum (G. B. Sowerby I, 1843)
- Species Neocyclotus colombiensis S. I. Da Costa, 1901 accepted as Aperostoma colombiense (S. I. Da Costa, 1901)
- Species Neocyclotus connivens (H. Adams, 1867)
- Species Neocyclotus corpulentum [sic] accepted as Neocyclotus corpulentus (E. A. Smith, 1878)
- Species Neocyclotus corpulentus (E. A. Smith, 1878)
- Species Neocyclotus corrugatior (Chitty, 1857) accepted as Poteria corrugatior (Chitty, 1857)
- Species Neocyclotus corrugatissimus (Chitty, 1857) accepted as Poteria corrugatissima (Chitty, 1857)
- Species Neocyclotus corrugatus (G. B. Sowerby I, 1843)
- Species Neocyclotus crassus (C. B. Adams, 1851) accepted as Poteria crassa (C. B. Adams, 1851)
- Species Neocyclotus crosseanus (Hidalgo, 1866) accepted as Lagocyclus crosseanus (Hidalgo, 1866)
- Species Neocyclotus cumingii (G. B. Sowerby I, 1832) accepted as Calaperostoma cumingii (G. B. Sowerby I, 1832)
- Species Neocyclotus cycloatus (Chitty, 1857) accepted as Poteria lineata (Gray, 1850)
- Species Neocyclotus dentistigmatus (Chitty, 1857) accepted as Cyclochittya dentistigmata (Chitty, 1857)
- Species Neocyclotus depressus S. I. Da Costa, 1906 accepted as Aperostoma depressum (S. I. Da Costa, 1906)
- Species Neocyclotus distinctus (G. B. Sowerby I, 1843)
- Species Neocyclotus duffianus (C. B. Adams, 1845) accepted as Incidostoma duffianum (C. B. Adams, 1845)
- Species Neocyclotus dysoni (L. Pfeiffer, 1853)
- Species Neocyclotus fischeri (Hidalgo, 1867) accepted as Aperostoma fischeri (Hidalgo, 1867)
- Species Neocyclotus fonticulus Preston, 1911 accepted as Cyclopilsbrya fonticula (Preston, 1911)
- Species Neocyclotus gemma (Chitty, 1857) accepted as Poteria gemma (Chitty, 1857)
- Species Neocyclotus giganteus (Reeve, 1842) accepted as Aperostoma giganteum (Reeve, 1842)
- Species Neocyclotus glaucostomus (L. Pfeiffer, 1863)
- Species Neocyclotus granadensis (Shuttleworth, 1857)
- Species Neocyclotus granulatus (L. Pfeiffer, 1863)
- Species Neocyclotus grenadensis (Shuttleworth, 1857) accepted as Neocyclotus granadensis (Shuttleworth, 1857)
- Species Neocyclotus haematomma (L. Pfeiffer, 1863) accepted as Lagocyclus haematomma (L. Pfeiffer, 1863)
- Species Neocyclotus hidalgoi (Crosse, 1866) accepted as Calaperostoma hidalgoi (Crosse, 1866)
- Species Neocyclotus incomptus (G. B. Sowerby I, 1850) accepted as Incidostoma incomptum (G. B. Sowerby I, 1850)
- Species Neocyclotus inutilis (Chitty, 1857) accepted as Poteria inutilis (Chitty, 1857)
- Species Neocyclotus jamaicensis (Dillwyn, 1823) accepted as Poteria jamaicensis (Dillwyn, 1823)
- Species Neocyclotus jugosus (C. B. Adams, 1851) accepted as Cyclopilsbrya jugosa (C. B. Adams, 1851)
- Species Neocyclotus kugleri (Bartsch & J. P. E. Morrison, 1942)
- Species Neocyclotus limellum (Bartsch & J. P. E. Morrison, 1942)
- Species Neocyclotus martensi Kobelt, 1912 accepted as Poteria martensi (Kobelt, 1912)
- Species Neocyclotus martinicensis (Shuttleworth, 1857) accepted as Amphicyclotulus martinicensis (Shuttleworth, 1857)
- Species Neocyclotus nodosus (Chitty, 1857) accepted as Poteria nodosa (Chitty, 1857)
- Species Neocyclotus notatior (Chitty, 1857) accepted as Cyclobakeria notatior (Chitty, 1857)
- Species Neocyclotus notatus (Chitty, 1857) accepted as Poteria notata (Chitty, 1857)
- Species Neocyclotus novaespei Chitty, 1857 accepted as Cyclobakeria novaespei (Chitty, 1857)
- Species Neocyclotus pallescens (C. B. Adams, 1851) accepted as Poteria pallescens (C. B. Adams, 1851)
- Species Neocyclotus panamensis Da Costa, 1904
- Species Neocyclotus pazi (Crosse, 1866) accepted as Incidostoma pazi (Crosse, 1866)
- Species Neocyclotus peilei Gude, 1912
- Species Neocyclotus perezi (Hidalgo, 1866) accepted as Incidostoma perezi (Hidalgo, 1866)
- Species Neocyclotus pergrandis Kobelt, 1912 accepted as Incidostoma pergrande (Kobelt, 1912)
- Species Neocyclotus peruvianus S. I. Da Costa, 1906 accepted as Aperostoma peruvianum (S. I. Da Costa, 1906)
- Species Neocyclotus popayanus (I. Lea, 1838) accepted as Incidostoma popayanum (I. Lea, 1838)
- Species Neocyclotus prominulus (A. d'Orbigny, 1838)
- Species Neocyclotus quitensis (L. Pfeiffer, 1852) accepted as Incidostoma quitense (L. Pfeiffer, 1852)
- Species Neocyclotus rugatus (Guppy, 1864)
- Species Neocyclotus rupisfontis (Chitty, 1857) accepted as Cyclopilsbrya rupisfontis (Chitty, 1857)
- Species Neocyclotus sanctamarthae (Pilsbry & G. H. Clapp, 1902)
- Species Neocyclotus simplicostus F. G. Thompson, 1969
- Species Neocyclotus smithi (Pilsbry & G. H. Clapp, 1902)
- Species Neocyclotus stramineus (G. B. Sowerby I, 1843)
- Species Neocyclotus subrugosus (G. B. Sowerby I, 1850) accepted as Poteria subrugosa (G. B. Sowerby I, 1850)
- Species Neocyclotus translucidus (G. B. Sowerby I, 1843) accepted as Aperostoma translucidum (G. B. Sowerby I, 1843)
- Species Neocyclotus varians (C. B. Adams, 1851) accepted as Poteria varians (C. B. Adams, 1851)
- Species Neocyclotus vincentinus (Pilsbry, 1935)
- Species Neocyclotus westmorelandensis (Chitty, 1857) accepted as Cyclopilsbrya westmorelandensis (Chitty, 1857)
- Species Neocyclotus wetmorei (Bartsch & J. P. E. Morrison, 1942)
- Species Neocyclotus zigzag (Chitty, 1857) accepted as Poteria zigzag (Chitty, 1857)
- Genus Paramia Clench, 1949 accepted as Paramiella Clench, 1954
- Genus Paramiella Clench, 1954 (2)
- Genus Platystoma Mörch, 1859 accepted as Neocyclotus Crosse & P. Fischer, 1886
- Genus Plectocyclotus Kobelt & Möllendorff, 1899 accepted as Neocyclotus (Plectocyclotus) Kobelt & Möllendorff, 1899
- Genus Poteria J. E. Gray, 1850 (41)
- Genus Ptychocochlis C. T. Simpson, 1895 accepted as Poteria J. E. Gray, 1850
- Genus Xenocyclus F. G. Thompson, 1969 (1)
- Genus Austrocyclotus Bartsch, 1942 accepted as Neocyclotus Crosse & P. Fischer, 1886
- Genus Buckleyia E. T. Higgins, 1872 accepted as Daronia A. Adams, 1861
- Genus Cycladamsia Bartsch, 1942 (5)
- Genus Cyclochittya J. P. E. Morrison, 1955 (6)
- Genus Cyclojamaicia Bartsch, 1942 (2)
- Genus Cyclopilsbrya Bartsch, 1942 (12)
- Genus Cyclovendreysia Bartsch, 1942 (1)
- Genus Daronia A. Adams, 1861 (6)
- Genus Incerticyclus J. P. E. Morrison, 1955 (3)
- Genus Rugicyclotus J. P. E. Morrison, 1955 (1)
- Family Pollicariidae Thiele, 1929 (6)
- Family Pupinidae L. Pfeiffer, 1853 (421)
- Family Strophostomatidae Wenz, 1915 † accepted as Ferussininae Wenz, 1923 (1915) †
- Genus Carinomphalus W. Yü, 1974 † (1)
- Genus Diplommoptychia Maillard, 1884 †
- Genus Loriolina Huckriede, 1967 † (1)
- Genus Maillardinus Bandel, 1991 † (1)
- Superfamily Viviparoidea Gray, 1847 (764)
- Order Caenogastropoda incertae sedis (7 677)
- Order Littorinimorpha (17 189)
- 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