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Mollusca (132 848)
Subphylum Aculifera
Subphylum Conchifera
Subphylum Placophora accepted as Polyplacophora
Superclass Aplacophora
Class Amphineura accepted as Aculifera
Class Bivalvia (25 011)
Class Caudofoveata (143)
Class Cephalopoda (1 834)
Class Conchifera accepted as Bivalvia
Class Cricoconarida † (1)
Class Gastropoda (102 752)
Subclass Amphigastropoda † (396)
Subclass Angiogastropoda represented as Gastropoda
Subclass Apogastropoda
Subclass Caenogastropoda (53 669)
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)
Subfamily Alycaeinae W. T. Blanford, 1864 (370)
Subfamily Craspedopomatinae Kobelt & Möllendorff, 1898 accepted as Craspedopomatidae Kobelt & Möllendorff, 1898
Subfamily Cyclophoridae incertae sedis (36)
Subfamily Cyclophorinae J. E. Gray, 1847 (1 105)
Tribe Caspicyclotini Wenz, 1938 (4)
Tribe Cyathopomatini Kobelt & Möllendorff, 1897 (132)
Tribe Cyclophorini J. E. Gray, 1847 (672)
Tribe Cyclotini L. Pfeiffer, 1853 (164)
Genus Afrocyclus Cole, 2019 (5)
Genus Chondrocyclus Ancey, 1898 (14)
Genus Cyclotes [sic] accepted as Cyclotus Swainson, 1840
Genus Cyclotus Swainson, 1840 (111)
Subgenus Cyclotus (Adelomorpha) Tapparone Canefri, 1886 accepted as Pseudocyclotus Thiele, 1894
Subgenus Cyclotus (Aperostoma) Troschel, 1847 accepted as Aperostoma Troschel, 1847
Subgenus Cyclotus (Aulacopoma) Möllendorff, 1897 represented as Cyclotus Swainson, 1840
Subgenus Cyclotus (Caspicyclotus) Forcart, 1935 represented as Caspicyclotus Forcart, 1935
Subgenus Cyclotus (Cyclotus) Swainson, 1840 represented as Cyclotus Swainson, 1840
Species Cyclotus (Cyclotus) angulatus E. von Martens, 1874 represented as Cyclotus angulatus E. von Martens, 1874
Species Cyclotus (Cyclotus) atratus Ancey, 1890 represented as Cyclotus atratus Ancey, 1890
Species Cyclotus (Cyclotus) auriculatus Kobelt, 1884 represented as Cyclotus auriculatus Kobelt, 1884
Species Cyclotus (Cyclotus) batchianensis L. Pfeiffer, 1861 represented as Cyclotus batchianensis L. Pfeiffer, 1861
Species Cyclotus (Cyclotus) bernsteini E. von Martens, 1863 represented as Cyclotus bernsteini E. von Martens, 1863
Species Cyclotus (Cyclotus) biangulatus E. von Martens, 1891 represented as Cyclotus biangulatus E. von Martens, 1891
Species Cyclotus (Cyclotus) bonensis P. Sarasin & F. Sarasin, 1899 represented as Cyclotus bonensis P. Sarasin & F. Sarasin, 1899
Species Cyclotus (Cyclotus) buginensis P. Sarasin & F. Sarasin, 1899 represented as Cyclotus buginensis P. Sarasin & F. Sarasin, 1899
Species Cyclotus (Cyclotus) caroli Kobelt, 1884 represented as Cyclotus caroli Kobelt, 1884
Species Cyclotus (Cyclotus) euzonus Dohrn, 1889 represented as Cyclotus euzonus Dohrn, 1889
Species Cyclotus (Cyclotus) fasciatus E. von Martens, 1864 represented as Cyclotus fasciatus E. von Martens, 1864
Species Cyclotus (Cyclotus) floresianus E. von Martens, 1891 represented as Cyclotus floresianus E. von Martens, 1891
Species Cyclotus (Cyclotus) jellesmae P. Sarasin & F. Sarasin, 1899 represented as Cyclotus jellesmae P. Sarasin & F. Sarasin, 1899
Species Cyclotus (Cyclotus) latruncularius P. Sarasin & F. Sarasin, 1899 represented as Cyclotus latruncularius P. Sarasin & F. Sarasin, 1899
Species Cyclotus (Cyclotus) lowianus (L. Pfeiffer, 1864) represented as Cyclotus lowianus (L. Pfeiffer, 1864)
Species Cyclotus (Cyclotus) mindaiensis (Bock, 1881) represented as Cyclotus mindaiensis (Bock, 1881)
Species Cyclotus (Cyclotus) mindoricus Quadras & Möllendorff, 1896 represented as Cyclotus mindoricus Quadras & Möllendorff, 1896
Species Cyclotus (Cyclotus) minor (E. von Martens, 1872) represented as Cyclotus minor (E. von Martens, 1873)
Species Cyclotus (Cyclotus) nigrispirus P. Sarasin & F. Sarasin, 1899 represented as Cyclotus nigrispirus P. Sarasin & F. Sarasin, 1899
Species Cyclotus (Cyclotus) palawanicus E. A. Smith, 1895 represented as Cyclotus palawanicus E. A. Smith, 1895
Species Cyclotus (Cyclotus) pruinosus E. von Martens, 1863 represented as Cyclotus pruinosus E. von Martens, 1863
Species Cyclotus (Cyclotus) pyrostoma E. A. Smith, 1896 represented as Cyclotus pyrostoma E. A. Smith, 1896
Species Cyclotus (Cyclotus) semiliratus Möllendorff, 1896 represented as Cyclotus semiliratus Möllendorff, 1896
Species Cyclotus (Cyclotus) smithi Kobelt, 1902 represented as Cyclotus smithi Kobelt, 1902
Species Cyclotus (Cyclotus) sulcatus Möllendorff, 1890 represented as Cyclotus sulcatus Möllendorff, 1890
Species Cyclotus (Cyclotus) trusanensis Godwin-Austen, 1889 represented as Cyclotus trusanensis Godwin-Austen, 1889
Species Cyclotus (Cyclotus) variegatus Swainson, 1840 represented as Cyclotus variegatus Swainson, 1840
Species Cyclotus (Cyclotus) volvuloides (G. B. Sowerby I, 1850) accepted as Tropidophora semidecussata var. volvuloides (G. B. Sowerby I, 1850)
Subgenus Cyclotus (Eucyclotus) Möllendorff, 1890 accepted as Eucyclotus Möllendorff, 1890
Subgenus Cyclotus (Millotorbis) Fischer-Piette & Bedoucha, 1965 accepted as Millotorbis Fischer-Piette & Bedoucha, 1965
Subgenus Cyclotus (Nakadaella) Ancey, 1904 accepted as Nakadaella Ancey, 1904
Subgenus Cyclotus (Neocyclotus) Crosse & P. Fischer, 1886 accepted as Neocyclotus Crosse & P. Fischer, 1886
Subgenus Cyclotus (Opisthoporus) W. H. Benson, 1851 accepted as Opisthoporus W. H. Benson, 1851
Subgenus Cyclotus (Platyrhaphe) Möllendorff, 1890 accepted as Platyrhaphe Möllendorff, 1890
Subgenus Cyclotus (Procyclotus) P. Fischer, 1891 represented as Cyclotus Swainson, 1840
Subgenus Cyclotus (Pseudocyclophorus) Möllendorff, 1890 represented as Cyclotus Swainson, 1840
Subgenus Cyclotus (Siphonocyclus) Möllendorff, 1900 accepted as Cyclostoma (Opisthoporus) W. H. Benson, 1851
Species Cyclotus acanthoderma Tapparone Canefri, 1886 accepted as Pseudocyclotus acanthoderma (Tapparone Canefri, 1886)
Species Cyclotus alabastris Craven, 1881 accepted as Chondrocyclus alabastris (Craven, 1881)
Species Cyclotus amabilis Fulton, 1905
Species Cyclotus amboinensis (L. Pfeiffer, 1854)
Species Cyclotus amethystinus Guppy, 1868 accepted as Amphicyclotulus amethystinus (Guppy, 1868)
Species Cyclotus angulatus E. von Martens, 1874
Species Cyclotus anocamptus Möllendorff, 1895 accepted as Platyrhaphe anocampta (Möllendorff, 1895)
Species Cyclotus anthopoma Möllendorff, 1895 accepted as Platyrhaphe anthopoma (Möllendorff, 1895)
Species Cyclotus approximans Heude, 1882
Species Cyclotus asperulus (G. B. Sowerby I, 1843) accepted as Cyclopilsbrya asperula (G. B. Sowerby I, 1843)
Species Cyclotus atratus Ancey, 1890
Species Cyclotus auriculatus Kobelt, 1884
Species Cyclotus bairdianus Chitty, 1857 accepted as Cycladamsia bairdiana (Chitty, 1857)
Species Cyclotus batchianensis L. Pfeiffer, 1861
Species Cyclotus beilanensis Preston, 1913
Species Cyclotus belfordi Hedley, 1891 accepted as Dominamaria belfordi (Hedley, 1891)
Species Cyclotus bemarahae K. C. Emberton, 2004
Species Cyclotus berendti L. Pfeiffer, 1861 accepted as Neocyclotus dysoni berendti (L. Pfeiffer, 1861)
Species Cyclotus bernardii (L. Pfeiffer, 1862) accepted as Opisthoporus bernardii (L. Pfeiffer, 1862)
Species Cyclotus bernsteini E. von Martens, 1863
Species Cyclotus beswicki Chitty, 1857 accepted as Cyclopilsbrya beswicki (Chitty, 1857)
Species Cyclotus biangulatus E. von Martens, 1891
Species Cyclotus bicarinatus E. von Martens, 1864
Species Cyclotus biggsi Schlesch, 1934 accepted as Caspicyclotus sieversi (L. Pfeiffer, 1871)
Species Cyclotus birostris (L. Pfeiffer, 1855) accepted as Opisthoporus birostris (L. Pfeiffer, 1855)
Species Cyclotus bisinuatus E. von Martens, 1864 accepted as Neocyclotus bisinuatus (E. von Martens, 1864)
Species Cyclotus bogotensis (L. Pfeiffer, 1855) accepted as Aperostoma bogotense (L. Pfeiffer, 1855)
Species Cyclotus bonensis P. Sarasin & F. Sarasin, 1899
Species Cyclotus bongaoensis E. A. Smith, 1894 accepted as Platyrhaphe bongaoensis (E. A. Smith, 1894)
Species Cyclotus borealis (Möllendorff, 1885)
Species Cyclotus boucardi Angas, 1878 accepted as Barbacyclus boucardi (Angas, 1878)
Species Cyclotus bourguignati Doumet-Adanson, 1885 accepted as Caspicyclotus sieversi (L. Pfeiffer, 1871)
Species Cyclotus boxalli Godwin-Austen, 1889
Species Cyclotus buginensis P. Sarasin & F. Sarasin, 1899
Species Cyclotus campanulatus E. von Martens, 1865
Species Cyclotus canaliculatus Möllendorff, 1895
Species Cyclotus carinornatus Bollinger, 1918
Species Cyclotus carinulatus E. von Martens, 1864
Species Cyclotus caroli Kobelt, 1884
Species Cyclotus celebensis E. A. Smith, 1896 accepted as Pterocyclos celebensis (E. A. Smith, 1896)
Species Cyclotus charmian F. W. Hutton, 1883 accepted as Gonatorhaphe fornicata (L. Pfeiffer, 1854)
Species Cyclotus chinensis (L. Pfeiffer, 1855)
Species Cyclotus cinctus F. E. Edwards, 1852 † accepted as Bembridgia cincta (F. E. Edwards, 1852) †
Species Cyclotus cingulatus (G. B. Sowerby I, 1843) accepted as Aperostoma cingulatum (G. B. Sowerby I, 1843)
Species Cyclotus cochinchinensis (L. Pfeiffer, 1857) accepted as Rhiostoma cochinchinense (L. Pfeiffer, 1857)
Species Cyclotus confluens (L. Pfeiffer, 1860)
Species Cyclotus conicus E. von Martens, 1860 accepted as Lagocheilus conicus (E. von Martens, 1860)
Species Cyclotus conoideus Möllendorff, 1902
Species Cyclotus conoideus (L. Pfeiffer, 1846) accepted as Cyclotopsis conoidea (L. Pfeiffer, 1846)
Species Cyclotus cooperi Tryon, 1863 accepted as Dicrista cooperi (Tryon, 1863)
Species Cyclotus coquandi [sic] † accepted as Bembridgia elegantilites (Boubée, 1831) †
Species Cyclotus corniculus (Mousson, 1849) accepted as Opisthoporus corniculus (Mousson, 1849)
Species Cyclotus corpulentus E. A. Smith, 1878 accepted as Neocyclotus corpulentus (E. A. Smith, 1878)
Species Cyclotus corrugatior Chitty, 1857 accepted as Poteria corrugatior (Chitty, 1857)
Species Cyclotus corrugatissimus Chitty, 1857 accepted as Poteria corrugatissima (Chitty, 1857)
Species Cyclotus corrugatus (Menke, 1829) sensu Chitty, 1857 accepted as Cyclochittya magister (Bartsch, 1942)
Species Cyclotus crassus (C. B. Adams, 1851) accepted as Poteria crassa (C. B. Adams, 1851)
Species Cyclotus cycloatus Chitty, 1857 accepted as Poteria lineata (Gray, 1850)
Species Cyclotus cyclophoroides Möllendorff, 1890
Species Cyclotus danieli (Morlet, 1886)
Species Cyclotus daucinus (L. Pfeiffer, 1857)
Species Cyclotus dautzenbergi de Morgan, 1886 accepted as Cyclotus solutus solutus (Stoliczka, 1872)
Species Cyclotus dautzenbergi (Sykes, 1902)
Species Cyclotus deburghaeanus Chitty, 1857 accepted as Cycladamsia seminuda (C. B. Adams, 1851)
Species Cyclotus deflexus (Möllendorff, 1897) accepted as Cyclotus (Siphonocyclus) yeni Zilch, 1956
Species Cyclotus dentistigmatus Chitty, 1857 accepted as Cyclochittya dentistigmata (Chitty, 1857)
Species Cyclotus difficillimus Schmacker & O. Boettger, 1890
Species Cyclotus dimidiatus Kobelt, 1896
Species Cyclotus discoideus (G. B. Sowerby I, 1843)
Species Cyclotus discoideus F. Haas, 1912
Species Cyclotus discriminendus B. Rensch, 1934
Species Cyclotus distomellus (G. B. Sowerby I, 1843)
Species Cyclotus dohrni Kobelt, 1902
Species Cyclotus dunkeri L. Pfeiffer, 1857 accepted as Incidostoma dunkeri (L. Pfeiffer, 1857)
Species Cyclotus dysoni (L. Pfeiffer, 1851) accepted as Neocyclotus dysoni (L. Pfeiffer, 1853)
Species Cyclotus erroneus Heude, 1890 accepted as Platyrhaphe (Platyrhaphe) erronea (Heude, 1890)
Species Cyclotus euryomphalus (L. Pfeiffer, 1857) accepted as Opisthoporus euryomphalus (L. Pfeiffer, 1857)
Species Cyclotus eurystoma Möllendorff, 1894 accepted as Platyrhaphe eurystoma (Möllendorff, 1894)
Species Cyclotus euzonus Dohrn, 1889
Species Cyclotus exaratus F. Sandberger, 1870 † accepted as Palaeocyclotus exaratus (F. Sandberger, 1870) †
Species Cyclotus fasciatus E. von Martens, 1864
Species Cyclotus filoliratus G. B. Sowerby III, 1892 accepted as Aperostoma filoliratum (G. B. Sowerby III, 1892)
Species Cyclotus filoliratus G. B. Sowerby III, 1892
Species Cyclotus fischeri Hidalgo, 1867 accepted as Aperostoma fischeri (Hidalgo, 1867)
Species Cyclotus floresianus E. von Martens, 1891
Species Cyclotus fodiens Heude, 1882 accepted as Platyrhaphe (Platyrhaphe) fodiens (Heude, 1882)
Species Cyclotus fooni Thach & F. Huber, 2021
Species Cyclotus fortunei L. Pfeiffer, 1852
Species Cyclotus fossor Heude, 1886 accepted as Platyrhaphe fossor (Heude, 1886)
Species Cyclotus fulminulatus E. von Martens, 1865
Species Cyclotus gallorum K. C. Emberton, 2004
Species Cyclotus gassiesianus Crosse, 1867
Species Cyclotus gemma Chitty, 1857 accepted as Poteria gemma (Chitty, 1857)
Species Cyclotus giganteus (Reeve, 1842) accepted as Aperostoma giganteum (Reeve, 1842)
Species Cyclotus gordoni (W. H. Benson, 1863)
Species Cyclotus gradatus Möllendorff, 1894 accepted as Platyrhaphe gradata (Möllendorff, 1894)
Species Cyclotus granadensis (Shuttleworth, 1857) accepted as Neocyclotus granadensis (Shuttleworth, 1857)
Species Cyclotus granulatus L. Pfeiffer, 1863 accepted as Neocyclotus granulatus (L. Pfeiffer, 1863)
Species Cyclotus grenadensis (Shuttleworth, 1857) accepted as Neocyclotus granadensis (Shuttleworth, 1857)
Species Cyclotus griffithsi K. C. Emberton, 2004
Species Cyclotus grohi (Thach & F. Huber, 2018)
Species Cyclotus guttatus (L. Pfeiffer, 1853)
Species Cyclotus gwendolenae (Godwin-Austen, 1889)
Species Cyclotus hainanensis (H. Adams, 1870)
Species Cyclotus harryleei (Thach & F. Huber, 2018)
Species Cyclotus hebraicus (R. P. Lesson, 1831)
Species Cyclotus herzi O. Boettger, 1889 accepted as Caspicyclotus sieversi (L. Pfeiffer, 1871)
Species Cyclotus hirasei Pilsbry, 1901 accepted as Platyrhaphe hirasei (Pilsbry, 1901)
Species Cyclotus horridus Hedley, 1891 accepted as Dominamaria horrida (Hedley, 1891)
Species Cyclotus huberi Thach, 2018
Species Cyclotus hunanensis Gredler, 1881 accepted as Platyrhaphe hunana (Gredler, 1881)
Species Cyclotus hunanus Gredler, 1881 accepted as Platyrhaphe (Platyrhaphe) hunana (Gredler, 1881)
Species Cyclotus hungerfordi (Godwin-Austen, 1889)
Species Cyclotus hungerfordianus Möllendorff, 1887 accepted as Platyrhaphe lowi lowi (de Morgan, 1885)
Species Cyclotus illotus A. Gould, 1859 accepted as Platyrhaphe illota (A. Gould, 1859)
Species Cyclotus inca (A. d'Orbigny, 1835) accepted as Aperostoma inca (A. d'Orbigny, 1835)
Species Cyclotus incomptus Reeve, 1863 accepted as Incidostoma hedui (Bartsch & J. P. E. Morrison, 1942)
Species Cyclotus inutilis Chitty, 1857 accepted as Poteria inutilis (Chitty, 1857)
Species Cyclotus iris (Godwin-Austen, 1889)
Species Cyclotus irregularis (L. Pfeiffer, 1855) accepted as Incidostoma irregulare (L. Pfeiffer, 1855)
Species Cyclotus isipingoensis Sturany, 1898 accepted as Afrocyclus isipingoensis (Sturany, 1898)
Species Cyclotus jellesmae P. Sarasin & F. Sarasin, 1899
Species Cyclotus jugosus (C. B. Adams, 1851) accepted as Cyclopilsbrya jugosa (C. B. Adams, 1851)
Species Cyclotus kaimanaensis Dharma, 2021
Species Cyclotus kalryenense W. T. Blanford & H. F. Blanford, 1861 accepted as Cyathopoma kalryenense (W. T. Blanford & H. F. Blanford, 1861)
Species Cyclotus kowaldi Hedley, 1891 accepted as Dominamaria kowaldi (Hedley, 1891)
Species Cyclotus labuanensis (L. Pfeiffer, 1864)
Species Cyclotus laevigatus F. Sandberger, 1870 † accepted as Procyclotopsis laevigata (F. Sandberger, 1870) †
Species Cyclotus latecostatus Kobelt, 1884 accepted as Platyrhaphe latecostata (Kobelt, 1884)
Species Cyclotus lateplicatus Möllendorff, 1896 accepted as Platyrhaphe lateplicata (Möllendorff, 1896)
Species Cyclotus latistrigus E. von Martens, 1864 accepted as Opisthoporus latistrigus (E. von Martens, 1864)
Species Cyclotus latruncularius P. Sarasin & F. Sarasin, 1899
Species Cyclotus lepidotus Vermeulen, 1996
Species Cyclotus leytensis Möllendorff, 1890
Species Cyclotus lindstedti (L. Pfeiffer, 1857)
Species Cyclotus lineatus Gray, 1850 accepted as Poteria lineata (Gray, 1850)
Species Cyclotus linitus Godwin-Austen, 1889 accepted as Platyrhaphe linita (Godwin-Austen, 1889)
Species Cyclotus liratulus E. von Martens, 1864 accepted as Pseudocyclotus liratulus (E. von Martens, 1864)
Species Cyclotus liratus Möllendorff, 1902
Species Cyclotus lombockensis E. A. Smith, 1898
Species Cyclotus longipilus E. von Martens, 1865
Species Cyclotus lowianus (L. Pfeiffer, 1864)
Species Cyclotus lubricus (Dautzenberg & Fischer, 1908) accepted as Opisthoporus lubricus Dautzenberg & H. Fischer, 1908
Species Cyclotus macassaricus P. Sarasin & F. Sarasin, 1899
Species Cyclotus major E. von Martens, 1872 accepted as Cyclotus meyeri P. Sarasin & F. Sarasin, 1899
Species Cyclotus majusculum (Morelet, 1851) accepted as Annularita majuscula (Morelet, 1851)
Species Cyclotus malabaricus W. T. Blanford & H. F. Blanford, 1860 accepted as Cyathopoma malabaricum (W. T. Blanford & H. F. Blanford, 1860)
Species Cyclotus mamillaris Odhner, 1919
Species Cyclotus martensi Maltzan, 1888 accepted as Rolleia martensi (Maltzan, 1888)
Species Cyclotus masbatensis Pilsbry, 1928
Species Cyclotus meyeri P. Sarasin & F. Sarasin, 1899
Species Cyclotus microchilus (Crosse, 1868)
Species Cyclotus micromamillaris K. C. Emberton, 2004
Species Cyclotus micron Pilsbry, 1900 accepted as Nakadaella micron (Pilsbry, 1900)
Species Cyclotus mindaiensis (Bock, 1881)
Species Cyclotus mindoricus Quadras & Möllendorff, 1896
Species Cyclotus minimus L. Pfeiffer, 1859 accepted as Ceratodiscus minimus (L. Pfeiffer, 1859)
Species Cyclotus minor E. A. Smith, 1894 accepted as Cyclotus smithi Kobelt, 1902
Species Cyclotus minor (E. von Martens, 1873)
Species Cyclotus minutus H. Adams, 1866 accepted as Platyrhaphe minuta (H. Adams, 1866)
Species Cyclotus mucronatus (G. B. Sowerby I, 1843) accepted as Platyrhaphe mucronata (G. B. Sowerby I, 1843)
Species Cyclotus namorokae K. C. Emberton, 2004
Species Cyclotus natalensis L. Pfeiffer, 1862 accepted as Maizania natalensis (L. Pfeiffer, 1862)
Species Cyclotus natunensis E. A. Smith, 1894
Species Cyclotus niasensis Fulton, 1907
Species Cyclotus nigrispirus P. Sarasin & F. Sarasin, 1899
Species Cyclotus nodosus Chitty, 1857 accepted as Poteria nodosa (Chitty, 1857)
Species Cyclotus notatior Chitty, 1857 accepted as Cyclobakeria notatior (Chitty, 1857)
Species Cyclotus notatus Chitty, 1857 accepted as Poteria notata (Chitty, 1857)
Species Cyclotus novaespei Chitty, 1857 accepted as Cyclobakeria novaespei (Chitty, 1857)
Species Cyclotus novoguineensis Tapparone Canefri, 1883
Species Cyclotus novussaltus Chitty, 1857 accepted as Poteria novussaltus (Chitty, 1857)
Species Cyclotus nudus F. E. Edwards, 1852 † accepted as Cyclotellina nuda (F. E. Edwards, 1852) †
Species Cyclotus nudus Pilsbry & Hirase, 1904 accepted as Platyrhaphe hirasei nudus (Pilsbry & Hirase, 1904)
Species Cyclotus obesus E. von Martens, 1863
Species Cyclotus obscuratus B. Rensch, 1931
Species Cyclotus obtusicosta F. Sandberger, 1870 † accepted as Procyclotopsis obtusicosta (F. Sandberger, 1870) †
Species Cyclotus palawanicus E. A. Smith, 1895
Species Cyclotus pallescens (C. B. Adams, 1851) accepted as Poteria pallescens (C. B. Adams, 1851)
Species Cyclotus pandarus P. Sarasin & F. Sarasin, 1899
Species Cyclotus papuanus Kobelt, 1911 accepted as Cyclotus distomellus (G. B. Sowerby I, 1843)
Species Cyclotus parvulus E. von Martens, 1863 accepted as Platyrhaphe parvula (E. von Martens, 1863)
Species Cyclotus pazi Crosse, 1866 accepted as Incidostoma pazi (Crosse, 1866)
Species Cyclotus peramplas E. von Martens, 1903
Species Cyclotus perdistinctus L. Pfeiffer, 1858 accepted as Cyclocubana perdistincta (L. Pfeiffer, 1858)
Species Cyclotus perezi Hidalgo, 1866 accepted as Incidostoma perezi (Hidalgo, 1866)
Species Cyclotus petricosus (Morelet, 1851) accepted as Chondrothyra petricosa (Morelet, 1851)
Species Cyclotus plicosus E. von Martens, 1863 accepted as Platyrhaphe plicosa (E. von Martens, 1863)
Species Cyclotus poirieri Tapparone Canefri, 1883 accepted as Lagocheilus poirieri (Tapparone Canefri, 1883)
Species Cyclotus politus (G. B. Sowerby I, 1843)
Species Cyclotus popayanus (I. Lea, 1838) accepted as Incidostoma popayanum (I. Lea, 1838)
Species Cyclotus porrectus Möllendorff, 1898
Species Cyclotus portlandensis Chitty, 1857 accepted as Poteria corrugata (Menke, 1829)
Species Cyclotus portoricensis O. Boettger, 1887 accepted as Amphicyclotulus portoricensis (O. Boettger, 1887)
Species Cyclotus pretiosus Chitty, 1857 accepted as Cycladamsia rubra (Chitty, 1857)
Species Cyclotus primaevus F. Sandberger, 1870 † accepted as Cyclophorus primaevus (F. Sandberger, 1870) †
Species Cyclotus primigenius Matheron, 1888 † accepted as Aperostoma primigenia (Matheron, 1888) †
Species Cyclotus prominulus (A. d'Orbigny, 1838) accepted as Neocyclotus prominulus (A. d'Orbigny, 1838)
Species Cyclotus pruinosus E. von Martens, 1863
Species Cyclotus pseudoreticulatus B. Rensch, 1933
Species Cyclotus pterocycloides (L. Pfeiffer, 1855)
Species Cyclotus ptychoraphe E. von Martens, 1864 accepted as Platyrhaphe ptychoraphe (E. von Martens, 1864)
Species Cyclotus ptychorhaphe E. von Martens, 1864 accepted as Platyrhaphe ptychoraphe (E. von Martens, 1864)
Species Cyclotus pulchellus (Morlet, 1889) accepted as Rhiostoma cambodjense (Morelet, 1875)
Species Cyclotus pulchellus Möllendorff, 1902
Species Cyclotus pusillus (G. B. Sowerby I, 1843) accepted as Platyrhaphe pusilla (G. B. Sowerby I, 1843)
Species Cyclotus pyrostoma E. A. Smith, 1896
Species Cyclotus quitensis L. Pfeiffer, 1852 accepted as Incidostoma quitense (L. Pfeiffer, 1852)
Species Cyclotus ranae B. Rensch, 1931
Species Cyclotus reticulatus E. von Martens, 1864
Species Cyclotus ruber Chitty, 1857 accepted as Cycladamsia rubra (Chitty, 1857)
Species Cyclotus rudisplanusque Chitty, 1857 accepted as Cycladamsia rudisplanusque (Chitty, 1857)
Species Cyclotus rugatellus Tapparone Canefri, 1883 accepted as Pseudocyclotus rugatellus (Tapparone Canefri, 1883)
Species Cyclotus rugatus Guppy, 1864 accepted as Neocyclotus rugatus (Guppy, 1864)
Species Cyclotus rupisfontis Chitty, 1857 accepted as Cyclopilsbrya rupisfontis (Chitty, 1857)
Species Cyclotus scalaris K. Miller, 1907 † accepted as Pomatias (Neobembridgia) arneggensis Wenz, 1923 †
Species Cyclotus scalaris L. Pfeiffer, 1852 accepted as Platyrhaphe scalaris (L. Pfeiffer, 1852)
Species Cyclotus schomburgianus Möllendorff, 1883
Species Cyclotus seducensis P. Sarasin & F. Sarasin, 1899 accepted as Cyclotus minor (E. von Martens, 1873)
Species Cyclotus semicanum (Morelet, 1851) accepted as Annularops semicana (Morelet, 1851)
Species Cyclotus semiliratus Möllendorff, 1896
Species Cyclotus sericatum (Morelet, 1851) accepted as Chondrothyra pudica (A. d'Orbigny, 1842)
Species Cyclotus setosus (Möllendorff, 1894)
Species Cyclotus siamensis (E. von Martens, 1860)
Species Cyclotus sieversi L. Pfeiffer, 1871 accepted as Caspicyclotus sieversi (L. Pfeiffer, 1871)
Species Cyclotus simonianus (Heude, 1886)
Species Cyclotus simplicissimus B. Rensch, 1933
Species Cyclotus smithi Kobelt, 1902
Species Cyclotus soembaensis Schepman, 1892
Species Cyclotus solutus (Stoliczka, 1872)
Species Cyclotus sontraensis Thach & F. Huber, 2020
Species Cyclotus spiniferus (Morelet, 1861)
Species Cyclotus stenomphalus Heude, 1882
Species Cyclotus stoevi Thach & F. Huber, 2021
Species Cyclotus stramineus (G. B. Sowerby I, 1843) accepted as Neocyclotus stramineus (G. B. Sowerby I, 1843)
Species Cyclotus subcanaliculatus Schepman, 1918 accepted as Cyclotus hebraicus (R. P. Lesson, 1831)
Species Cyclotus subflammulatus L. Pfeiffer, 1861
Species Cyclotus subpictus Sinzov, 1877 †
Species Cyclotus succinctus E. von Martens, 1864
Species Cyclotus sulcatus Möllendorff, 1890
Species Cyclotus suluanus E. A. Smith, 1894
Species Cyclotus sumatranus (E. von Martens, 1864)
Species Cyclotus swinhoei H. Adams, 1866 accepted as Platyrhaphe swinhoei (H. Adams, 1866)
Species Cyclotus taivanus H. Adams, 1870
Species Cyclotus tanegashimanus Pilsbry & Y. Hirase, 1908 accepted as Cyclotus (Procyclotus) campanulatus tanegashimanus Pilsbry & Y. Hirase, 1908
Species Cyclotus tener (Menke, 1856)
Species Cyclotus tourannensis (Souleyet, 1852)
Species Cyclotus trailli L. Pfeiffer, 1862 accepted as Cyclotopsis trailli (L. Pfeiffer, 1862)
Species Cyclotus translucidus (G. B. Sowerby I, 1843) accepted as Aperostoma translucidum (G. B. Sowerby I, 1843)
Species Cyclotus trinitensis Guppy, 1864 accepted as Aperostoma translucidum trinitense (Guppy, 1864)
Species Cyclotus tristis Tapparone Canefri, 1883 accepted as Pseudocyclotus tristis (Tapparone Canefri, 1883)
Species Cyclotus trusanensis Godwin-Austen, 1889
Species Cyclotus tubaeformis Möllendorff, 1882
Species Cyclotus tubuliferus (L. Pfeiffer, 1854)
Species Cyclotus tunicatus Tapparone Canefri, 1886 accepted as Pseudocyclotus tunicatus (Tapparone Canefri, 1886)
Species Cyclotus umbraticus van Benthem Jutting, 1949 accepted as Pterocyclos umbraticus (van Benthem Jutting, 1949)
Species Cyclotus varians (C. B. Adams, 1851) accepted as Poteria varians (C. B. Adams, 1851)
Species Cyclotus variegatus Swainson, 1840
Species Cyclotus vespertinum (Morelet, 1851) accepted as Chondropoma vespertinum (Morelet, 1851)
Species Cyclotus vicinus E. A. Smith, 1896
Species Cyclotus volvuloides (G. B. Sowerby I, 1850) accepted as Tropidophora semidecussata var. volvuloides (G. B. Sowerby I, 1850)
Species Cyclotus westmorelandensis Chitty, 1857 accepted as Cyclopilsbrya westmorelandensis (Chitty, 1857)
Species Cyclotus wuellerstorfianus Zelebor, 1867 accepted as Lagocheilus wuellerstorfianus (Zelebor, 1867)
Species Cyclotus yeni Zilch, 1956
Species Cyclotus zigzag Chitty, 1857 accepted as Poteria zigzag (Chitty, 1857)
Genus Eucyclotus Möllendorff, 1890
Genus Nakadaella Ancey, 1904 (2)
Genus Opisthophorus [sic] accepted as Opisthoporus W. H. Benson, 1851
Genus Opisthoporus W. H. Benson, 1851 (28)
Genus Opistoporus [sic] accepted as Opisthoporus W. H. Benson, 1851
Genus Platyraphe Möllendorff, 1890 accepted as Platyrhaphe Möllendorff, 1890
Genus Speleocyclotus Vermeulen, Luu, Theary & Anker, 2019 (4)
Genus Tubicyclotus T. Habe, 1965 accepted as Cyclotus Swainson, 1840
Tribe Pterocyclini Kobelt & Möllendorff, 1897 (126)
Genus Aulopoma Troschel, 1847 (4)
Genus Pholeoteras Sturany, 1904 (3)
Subfamily Ferussininae Wenz, 1923 (1915) † (8)
Subfamily Platyrhaphidinae Páll-Gergely, 2024 (76)
Subfamily Spirostomatinae Tielecke, 1940 (4)
Genus Allardia Nicolas, 1898 †
Genus Diaspira Soós, 1911 accepted as Ditropopsis E. A. Smith, 1897
Genus Eotrichophorus D. A. Bullis, Herhold, Czekanski-Moir, Grimaldi & Rundell, 2020 † (2)
Genus Lagochilus P. Fischer, 1885 accepted as Lagocheilus W. T. Blanford, 1864
Genus Lagochilus W. T. Blanford, 1864 accepted as Lagocheilus W. T. Blanford, 1864
Genus Perissocyclos D. A. Bullis, Herhold, Czekanski-Moir, Grimaldi & Rundell, 2020 † (1)
Genus Strophites J. W. Dawson, 1880 † accepted as Dendropupa R. Owen, 1859 †
Genus Trotopyrgula X.-H. Yu, 1987 † (2)
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)
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 (7 676)
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