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Mollusca (132 754)
Subphylum Aculifera
Subphylum Conchifera
Subphylum Placophora accepted as Polyplacophora
Superclass Aplacophora
Class Amphineura accepted as Aculifera
Class Bivalvia (24 992)
Class Caudofoveata (143)
Class Cephalopoda (1 832)
Class Conchifera accepted as Bivalvia
Class Cricoconarida † (1)
Class Gastropoda (102 679)
Subclass Amphigastropoda † (387)
Subclass Angiogastropoda represented as Gastropoda
Subclass Apogastropoda
Subclass Caenogastropoda (53 623)
Subterclass Sorbeoconcha (147)
Superorder Hypsogastropoda
Order Architaenioglossa (4 917)
Order Caenogastropoda incertae sedis (7 675)
Suborder Heteroglossa
Suborder Ptenoglossa
Superfamily Abyssochrysoidea Tomlin, 1927 (104)
Superfamily Acteoninoidea Cossmann, 1895 †
Superfamily Campaniloidea (288)
Superfamily Cerithioidea J. Fleming, 1822 (3 706)
Family Alabinidae Dall, 1927 accepted as Bittiinae Cossmann, 1906
Family Amphimelaniidae P. Fischer & Crosse, 1891 (14)
Family Anaplocamidae Dall, 1921 accepted as Pleuroceridae P. Fischer, 1885 (1863)
Family Aplodontidae Kuroda, 1933 accepted as Modulidae P. Fischer, 1884
Family Archimediellidae Starobogatov, 1982 accepted as Turritellinae Lovén, 1847
Family Bathanaliidae Ancey, 1906 accepted as Hauttecoeuriinae Bourguignat, 1885
Family Batillariidae Thiele, 1929 (99)
Family Bittiidae accepted as Bittiinae Cossmann, 1906
Family Brachytrematidae Cossmann, 1906 † (25)
Family Ceriphasiidae Gill, 1863 accepted as Pleuroceridae P. Fischer, 1885 (1863)
Family Cerithideidae Houbrick, 1988 accepted as Potamididae H. Adams & A. Adams, 1854
Family Cerithiidae J. Fleming, 1822 (540)
Subfamily Bittiinae Cossmann, 1906 (185)
Genus Alabina Dall, 1902 (13)
Genus Argyropeza Melvill & Standen, 1901 (5)
Genus Bittiolum Cossmann, 1906 (5)
Genus Bittium Leach, 1847 (97)
Subgenus Bittium (Bittinella) Dall, 1924 accepted as Bittinella Dall, 1924
Subgenus Bittium (Bittiolum) Cossmann, 1906 accepted as Bittiolum Cossmann, 1906
Subgenus Bittium (Bittium) J. E. Gray, 1847 represented as Bittium Leach, 1847
Subgenus Bittium (Brachybittium) Weisbord, 1962 represented as Bittium Leach, 1847
Subgenus Bittium (Cerithidium) Monterosato, 1884 accepted as Cerithidium Monterosato, 1884
Subgenus Bittium (Elachista) Dall & Bartsch, 1901 † accepted as Alabina Dall, 1902
Subgenus Bittium (Goergesia) H. J. Anderson, 1960 † represented as Bittium Leach, 1847
Subgenus Bittium (Lirobittium) Bartsch, 1911 accepted as Lirobittium Bartsch, 1911
Subgenus Bittium (Rasbittium) Gründel, 1976 accepted as Bittium Leach, 1847
Subgenus Bittium (Semibittium) Cossmann, 1896 accepted as Semibittium Cossmann, 1896 †
Subgenus Bittium (Stylidium) Dall, 1907 accepted as Stylidium Dall, 1907
Subgenus Bittium (Styliferina) A. Adams, 1860 accepted as Styliferina A. Adams, 1860
Subgenus Bittium (Zebittium) H. J. Finlay, 1926 accepted as Zebittium H. J. Finlay, 1926
Species Bittium abruptum (R. B. Watson, 1880) accepted as Metaxia abrupta (R. B. Watson, 1880)
Species Bittium acummiense (Deshayes, 1864) †
Species Bittium acutangulum Yokoyama, 1924 accepted as Plesiotrochus acutangulus (Yokoyama, 1924)
Species Bittium adamsi (Dall, 1889) accepted as Finella adamsi (Dall, 1889)
Species Bittium adelomorphum (Cossmann, 1898) †
Species Bittium aedonium (R. B. Watson, 1880)
Species Bittium aeolomitres Melvill & Standen, 1896 accepted as Horologica aeolomitres (Melvill & Standen, 1896)
Species Bittium agibelicum (Zhizhchenko, 1936) †
Species Bittium alabastrulum (Mörch, 1876)
Species Bittium albocinctum Melvill & Standen, 1896 accepted as Cerithiopsis albocincta (Melvill & Standen, 1896)
Species Bittium alternatum (Say, 1822) accepted as Bittiolum alternatum (Say, 1822)
Species Bittium alutaceum A. Gould, 1861 accepted as Cerithium alutaceum (A. Gould, 1861)
Species Bittium amblyterum (R. B. Watson, 1880) accepted as Cerithiella amblytera (R. B. Watson, 1880)
Species Bittium amboynense (R. B. Watson, 1880)
Species Bittium anembatum (Melvill, 1904)
Species Bittium antarctonodosum Stilwell & Zinsmeister, 1992 † accepted as Cerithidea antarctonodosa (Stilwell & Zinsmeister, 1992) †
Species Bittium arenaense Hertlein & A. M. Strong, 1951
Species Bittium armillatum P. P. Carpenter, 1864 accepted as Lirobittium armillatum (P. P. Carpenter, 1864)
Species Bittium arnoldi Bartsch, 1911
Species Bittium asperoides Gabb, 1873 † accepted as Alabina asperoides (Gabb, 1873) †
Species Bittium asperulatum Cossmann & Peyrot, 1922 † accepted as Ataxocerithium asperulatum (Cossmann & Peyrot, 1922) †
Species Bittium asperulum Cossmann & Peyrot, 1922 † accepted as Bittium larrieyense Vignal, 1911 †
Species Bittium astrolabiensis Strebel, 1908 accepted as Cerithiella astrolabiensis (Strebel, 1908)
Species Bittium atramentarium Melvill & Standen, 1901
Species Bittium attenuatum P. P. Carpenter, 1864 accepted as Lirobittium attenuatum (P. P. Carpenter, 1864)
Species Bittium atticum F. Nordsieck, 1977 accepted as Bittium reticulatum (da Costa, 1778)
Species Bittium baicherei Doncieux, 1908 †
Species Bittium bandatum Bozzetti, 2019
Species Bittium barbarensis Bartsch, 1907 † accepted as Lirobittium asperum (Gabb, 1861)
Species Bittium bartolomense Bartsch, 1917
Species Bittium batillarium (Kuroda & T. Habe, 1971)
Species Bittium binodulosum Guzhov, 2022 †
Species Bittium binodulosum Yokoyama, 1920 †
Species Bittium bisculptum Strebel, 1908 accepted as Cerithiella bisculpta (Strebel, 1908)
Species Bittium boeticum (Pease, 1861) accepted as Cerithium boeticum Pease, 1861
Species Bittium botense Csepreghy-Meznerics, 1969 †
Species Bittium brucei Melvill & Standen, 1912 accepted as Cerithiopsis brucei (Melvill & Standen, 1912)
Species Bittium burdwoodianum Melvill & Standen, 1912 accepted as Cerithiella burdwoodiana (Melvill & Standen, 1912)
Species Bittium californicum Dall & Bartsch, 1901 accepted as Alabina californica (Dall & Bartsch, 1901)
Species Bittium canaliculatum Gabb, 1873 † accepted as Alabina asperoides canaliculata (Gabb, 1873) †
Species Bittium canejanense Cossmann & Peyrot, 1922 † accepted as Bittium larrieyense Vignal, 1911 †
Species Bittium capillaceum (Deshayes, 1864) †
Species Bittium caraboboense (Weisbord, 1962)
Species Bittium casmaliense Bartsch, 1911
Species Bittium catalaunense (Deshayes, 1864) †
Species Bittium catalinense Bartsch, 1911 accepted as Lirobittium purpureum (P. P. Carpenter, 1864)
Species Bittium caudatum Melvill, 1904
Species Bittium cerralvoense Bartsch, 1911
Species Bittium challisae Bartsch, 1917
Species Bittium chrysomallum Melvill, 1901
Species Bittium cinctum F. W. Hutton, 1885 † accepted as Seila chathamensis Suter, 1908
Species Bittium cinereoflavum Mörch, 1876 accepted as Cerithiopsis cinereoflava (Mörch, 1876)
Species Bittium circa D. Moreno, 2006
Species Bittium cossmanni Dall, 1892 † accepted as Hemicerithium cossmanni (Dall, 1892) †
Species Bittium costatum Gabb, 1873 † accepted as Schwartziella bryerea (Montagu, 1803)
Species Bittium courtillerianum (Millet, 1865) †
Species Bittium crassicostatum (Etheridge & Bell, 1898) †
Species Bittium crassum Landau, Ceulemans & Van Dingenen, 2018 †
Species Bittium craticulatum A. Gould, 1861
Species Bittium crosio Makiyama, 1927 †
Species Bittium cylindricum (R. B. Watson, 1880) accepted as Socienna cylindrica (R. B. Watson, 1880)
Species Bittium decussatum (P. P. Carpenter, 1857)
Species Bittium delicatum (R. B. Watson, 1880)
Species Bittium depauperatum R. B. Watson, 1897
Species Bittium digitatum (Zhizhchenko, 1934) †
Species Bittium diminutivum (R. A. Philippi, 1845)
Species Bittium diplax R. B. Watson, 1886 accepted as Cerithidium diplax (R. B. Watson, 1886)
Species Bittium dubiosum Friedberg, 1914 † accepted as Theodisca biseriata (Friedberg, 1914) †
Species Bittium duchasteli (Deshayes, 1833) †
Species Bittium eburneum Locard, 1897 accepted as Abyssochrysos eburneus (Locard, 1897)
Species Bittium elachistum Cossmann, 1889 †
Species Bittium elegantissimum (Hedley, 1899)
Species Bittium eniwetokense Ladd, 1972 †
Species Bittium eniwetokensis Ladd, 1972 † accepted as Bittium eniwetokense Ladd, 1972 †
Species Bittium enode (R. B. Watson, 1880) accepted as Cerithiella enodis (R. B. Watson, 1880)
Species Bittium eolomitres Melvill & Standen, 1896 accepted as Horologica eolomitres (Melvill & Standen, 1896)
Species Bittium eschrichtii (Middendorff, 1849) accepted as Neostylidium eschrichtii (Middendorff, 1849)
Species Bittium essomiense (Cossmann, 1888) †
Species Bittium estuarinum Tate, 1893 accepted as Zeacumantus plumbeus (G. B. Sowerby II, 1855)
Species Bittium esuriens P. P. Carpenter, 1864
Species Bittium evanescens Cossmann, 1898 † accepted as Semibittium evanescens (Cossmann, 1898) †
Species Bittium evolutum Cossmann & Peyrot, 1922 † accepted as Bittium vignali (Dollfus, 1909) †
Species Bittium exile (F. W. Hutton, 1873) accepted as Zebittium exile (F. W. Hutton, 1873)
Species Bittium fastigiatum P. P. Carpenter, 1864 accepted as Bittiolum fastigiatum (P. P. Carpenter, 1864)
Species Bittium fetellum Bartsch, 1911 accepted as Lirobittium fetellum (Bartsch, 1911)
Species Bittium furvum R. B. Watson, 1886 accepted as Cacozeliana furva (R. B. Watson, 1886)
Species Bittium fuscocapitulum Hedley & Petterd, 1906 accepted as Cacozeliana fuscocapitulum (Hedley & Petterd, 1906)
Species Bittium galactis Mörch, 1876
Species Bittium gallicum Landau, Ceulemans & Van Dingenen, 2018 †
Species Bittium gemmatum (R. B. Watson, 1880) accepted as Bittium watsoni (Jeffreys, 1885)
Species Bittium geyleri (O. Boettger, 1883) †
Species Bittium giganteum Bartsch, 1911
Species Bittium glareosum A. Gould, 1861
Species Bittium gliberti Van Dingenen, Ceulemans & Landau, 2016 †
Species Bittium grabaui Le Renard, 1994 †
Species Bittium granarium (Kiener, 1841) accepted as Cacozeliana granarium (Kiener, 1841)
Species Bittium granchii Stilwell & Zinsmeister, 1992 †
Species Bittium gravelyi Preston, 1916
Species Bittium hanleyanum Monterosato, 1889 accepted as Bittium simplex (Jeffreys, 1867)
Species Bittium hiloense Pilsbry & Vanatta, 1908 accepted as Bittinella hiloensis (Pilsbry & Vanatta, 1908)
Species Bittium houbricki Ponder, 1993 accepted as Ittibittium houbricki (Ponder, 1993)
Species Bittium ianthinum (A. Gould, 1849) accepted as Cerithium zebrum Kiener, 1841
Species Bittium icarus (Bayle, 1880) accepted as Cacozeliana icarus (Bayle, 1880)
Species Bittium impendens (Hedley, 1899)
Species Bittium incile R. B. Watson, 1897
Species Bittium insulsum Preston, 1908
Species Bittium intaminatum Yokoyama, 1931 †
Species Bittium intangibile (Deshayes, 1864) †
Species Bittium interfossa (P. P. Carpenter, 1864) accepted as Lirobittium interfossa (P. P. Carpenter, 1864)
Species Bittium jadertinum (Brusina, 1865) accepted as Bittium reticulatum (da Costa, 1778)
Species Bittium johnstonae Bartsch, 1911 accepted as Lirobittium johnstonae (Bartsch, 1911)
Species Bittium jucundum (Deshayes, 1864) †
Species Bittium kamalae Banerjee & Halder, 2024 †
Species Bittium kurodai Makiyama, 1927 †
Species Bittium lactescens (Jeffreys, 1867)
Species Bittium lacteum (R. A. Philippi, 1836)
Species Bittium larrieyense Vignal, 1911 †
Species Bittium larum Bartsch, 1911 accepted as Lirobittium larum (Bartsch, 1911)
Species Bittium latreillei [sic] accepted as Bittium latreillii (Payraudeau, 1826)
Species Bittium latreillii (Payraudeau, 1826)
Species Bittium lawleyanum Crosse, 1863 accepted as Zeacumantus plumbeus (G. B. Sowerby II, 1855)
Species Bittium leganyii Csepreghy-Meznerics, 1969 †
Species Bittium leucocephalum R. B. Watson, 1886 accepted as Argyropeza leucocephala (R. B. Watson, 1886)
Species Bittium lima (Bruguière, 1792)
Species Bittium liratum (Cossmann, 1892) †
Species Bittium lozoueti Van Dingenen, Ceulemans & Landau, 2016 †
Species Bittium lusciniae (R. B. Watson, 1880)
Species Bittium mamillanum (R. B. Watson, 1880) accepted as Cerithiella amblytera (R. B. Watson, 1880)
Species Bittium marileutes Melvill & Standen, 1896 accepted as Joculator marileutes (Melvill & Standen, 1896)
Species Bittium maximum F. Nordsieck & García-Talavera, 1979
Species Bittium mexicanum Bartsch, 1911
Species Bittium michaelseni Strebel, 1905 accepted as Eumetula michaelseni (Strebel, 1905)
Species Bittium midwayense Kosuge, 1979
Species Bittium minimum Tenison Woods, 1878 accepted as Cerithiopsis cessicus Hedley, 1906
Species Bittium minutulum Thiele, 1930 accepted as Batillariella minutula (Thiele, 1930)
Species Bittium miradouroense Sacchetti, Landau & Ávila, 2023 †
Species Bittium misellissimum Yokoyama, 1926 †
Species Bittium multiliratum Brusina, 1877 † accepted as Semibittium multiliratum (Brusina, 1877) †
Species Bittium munitum (P. P. Carpenter, 1864) accepted as Lirobittium munitum (P. P. Carpenter, 1864)
Species Bittium nanum (Mayer, 1864)
Species Bittium nicholsi Bartsch, 1911
Species Bittium nigrum (Totten, 1834) accepted as Bittiolum alternatum (Say, 1822)
Species Bittium nitens P. P. Carpenter, 1864
Species Bittium nodosocostatum Doncieux, 1908 †
Species Bittium numamuranum Yokoyama, 1924 † accepted as Bittium alutaceum A. Gould, 1861
Species Bittium oamaruticum Bartrum, 1919 †
Species Bittium oedumi Schnetler, 2001 †
Species Bittium oldroydae Bartsch, 1911 accepted as Lirobittium oldroydae (Bartsch, 1911)
Species Bittium oosimense (R. B. Watson, 1880) accepted as Plesiotrochus oosimensis (R. B. Watson, 1880)
Species Bittium ornatissimum Bartsch, 1911
Species Bittium oryza (Mörch, 1876) accepted as Ittibittium oryza (Mörch, 1876)
Species Bittium paleonotum Stilwell, Zinsmeister & Oleinik, 2004 †
Species Bittium panamense Bartsch, 1911
Species Bittium parcum A. Gould, 1861 accepted as Ittibittium parcum (A. Gould, 1861)
Species Bittium parvulum Nardini, 1934 †
Species Bittium perparvulum R. B. Watson, 1886 accepted as Cerithidium perparvulum (R. B. Watson, 1886)
Species Bittium perpusillum Tryon, 1887 accepted as Bittium glareosum A. Gould, 1861
Species Bittium perspicum G. B. Sowerby III, 1916
Species Bittium peruvianum (A. d'Orbigny, 1841)
Species Bittium philomelae (R. B. Watson, 1880)
Species Bittium pigrum (R. B. Watson, 1880)
Species Bittium pingue Landau, Ceulemans & Van Dingenen, 2018 †
Species Bittium podagrinum Dall, 1892 † accepted as Bittiolum podagrinum (Dall, 1892) †
Species Bittium porcellanum R. B. Watson, 1886
Species Bittium proteum (Jousseaume, 1931) accepted as Dahlakia proteum (Jousseaume, 1931)
Species Bittium pupiforme (R. B. Watson, 1880)
Species Bittium purnimae Banerjee & Halder, 2024 †
Species Bittium purpureum P. P. Carpenter, 1864 accepted as Lirobittium purpureum (P. P. Carpenter, 1864)
Species Bittium pusillum (Gould, 1851) accepted as Cerithium boeticum Pease, 1861
Species Bittium quadricinctum E. A. Smith, 1903
Species Bittium quadricinctum Doncieux, 1908 †
Species Bittium quadrifilatum P. P. Carpenter, 1864 accepted as Lirobittium quadrifilatum (P. P. Carpenter, 1864)
Species Bittium ragusianum Locard & Caziot, 1900 accepted as Bittium reticulatum (da Costa, 1778)
Species Bittium renauleauense Landau, Ceulemans & Van Dingenen, 2018 †
Species Bittium reticulatum (da Costa, 1778)
Subspecies Bittium reticulatum densespiratum Báldi, 1966 †
Subspecies Bittium reticulatum tschokrakense Özsayar, 1977 †
Variety Bittium reticulatum var. bifasciata Bucquoy, Dautzenberg & Dollfus, 1884 accepted as Bittium reticulatum (da Costa, 1778)
Variety Bittium reticulatum var. exigua Bucquoy, Dautzenberg & Dollfus, 1884 accepted as Bittium reticulatum (da Costa, 1778)
Variety Bittium reticulatum var. konkensis Sokolov, 1899 † accepted as Bittium spina (M. Hörnes, 1855) †
Variety Bittium reticulatum var. paludosa Bucquoy, Dautzenberg & Dollfus, 1884 accepted as Bittium scabrum (Olivi, 1792)
Species Bittium retiferum Suter, 1908 accepted as Specula retifera (Suter, 1908)
Species Bittium richei (Doncieux, 1903) †
Species Bittium ridgei Garvie, 1996 †
Species Bittium robustum Harmer, 1918 †
Species Bittium roveretoi Le Renard, 1994 †
Species Bittium rubanocinctum Glibert, 1958 †
Species Bittium rugatum P. P. Carpenter, 1864 accepted as Lirobittium rugatum (P. P. Carpenter, 1864)
Species Bittium sandori Jekelius, 1944 † accepted as Potamides disjunctus (J. De C. Sowerby, 1832) †
Species Bittium sanjuanensis Bartsch, 1917
Species Bittium santamariense Bartsch, 1917
Species Bittium scabrum (Olivi, 1792)
Species Bittium scalatum Dunker, 1871
Species Bittium semigranosum (Lamarck, 1804) †
Species Bittium semigranulosum [sic] † accepted as Bittium semigranosum (Lamarck, 1804) †
Species Bittium semilaevis Tenison Woods, 1878 accepted as Zaclys semilaevis (Tenison Woods, 1878)
Species Bittium serra Bartsch, 1917
Species Bittium seymourianum Strebel, 1908 accepted as Cerithiella seymouriana (Strebel, 1908)
Species Bittium simplex (Jeffreys, 1867) accepted as Bittium lactescens (Jeffreys, 1867)
Species Bittium spina (M. Hörnes, 1855) †
Species Bittium sublima (A. d'Orbigny, 1852) †
Species Bittium submammillatum (de Rayneval & Ponzi, 1854) accepted as Cerithidium submammillatum (de Rayneval & Ponzi, 1854)
Species Bittium subplanatum Bartsch, 1911 accepted as Lirobittium rugatum (P. P. Carpenter, 1864)
Species Bittium tenthrenois Melvill, 1896 accepted as Cerithiopsis tenthrenois (Melvill, 1896)
Species Bittium terebellum (R. A. Philippi, 1844) †
Species Bittium tokudai (Yokoyama, 1930) †
Species Bittium torresiense Melvill & Standen, 1899 accepted as Bittium elegantissimum (Hedley, 1899)
Species Bittium transenna (Bayan, 1873) †
Species Bittium tresquatrum Garvie, 1996 †
Species Bittium tricarinatum Pease, 1861 accepted as Metaxia tricarinata (Pease, 1861)
Species Bittium tuberculosum Yokoyama, 1927 † accepted as Tachyrhynchus tuberculosus (Yokoyama, 1927) †
Species Bittium tulskajense Iljina, 1993 †
Species Bittium tumidum Bartsch, 1907 accepted as Cerithiopsis tumida (Bartsch, 1907)
Species Bittium turbonilloides Tenison Woods, 1879 accepted as Specula turbonilloides (Tenison Woods, 1879)
Species Bittium turritelliformis Angas, 1877 accepted as Seilarex turritelliformis (Angas, 1877)
Species Bittium urasimanum Nomura & Niino, 1940 accepted as Tachyrhynchus urasimanus (Nomura & Niino, 1940)
Species Bittium uveanum Melvill & Standen, 1896 accepted as Joculator uveanus (Melvill & Standen, 1896)
Species Bittium vancouverense Dall & Bartsch, 1910
Species Bittium variegatum Brazier, 1894 accepted as Cacozeliana variegata (Brazier, 1894)
Species Bittium variegatum Kuroda & T. Habe, 1971 accepted as Cerithium variegatum (Kuroda & T. Habe, 1971)
Species Bittium varium (L. Pfeiffer, 1840) accepted as Bittiolum varium (L. Pfeiffer, 1840)
Species Bittium venustellum Yokoyama, 1927 † accepted as Tachyrhynchus venustellus (Yokoyama, 1927) †
Species Bittium venustulum (Millet, 1865) †
Species Bittium vignali (Dollfus, 1909) †
Species Bittium vitreum Suter, 1908 accepted as Tasmalira vitrea (Suter, 1908)
Species Bittium watsoni (Jeffreys, 1885)
Species Bittium xanthum R. B. Watson, 1886
Species Bittium yucatecanum Dall, 1881 accepted as Mathilda yucatecana (Dall, 1881)
Species Bittium zebrum (Kiener, 1841) accepted as Cerithium zebrum Kiener, 1841
Genus Cacozelia Iredale, 1924 accepted as Cacozeliana Strand, 1928
Genus Cacozeliana Strand, 1928 (6)
Genus Cassiella Gofas, 1987 (1)
Genus Cerithidium Monterosato, 1884 (15)
Genus Cerithiolum Tiberi, 1869 accepted as Bittium Leach, 1847
Genus Clathrofenella Kuroda & T. Habe, 1954 accepted as Cerithidium Monterosato, 1884 (1)
Genus Dahlakia H. E. J. Biggs, 1971 (1)
Genus Inobittium Monterosato, 1917 accepted as Bittium Leach, 1847
Genus Ittibittium Houbrick, 1993 (3)
Genus Limatium E. E. Strong & Bouchet, 2018 (2)
Genus Lirobittium Bartsch, 1911 (16)
Genus Manobittium Monterosato, 1917 accepted as Bittium Leach, 1847
Genus Neostylidium Doweld, 2013 (2)
Genus Pictorium E. E. Strong & Bouchet, 2013 (3)
Genus Semibittium Cossmann, 1896 † (7)
Genus Stylidium Dall, 1907 accepted as Neostylidium Doweld, 2013
Genus Varicopeza Gründel, 1976 (2)
Genus Zebittium H. J. Finlay, 1926 (6)
Subfamily Cerithiidae incertae sedis (36)
Subfamily Cerithiinae J. Fleming, 1822 (305)
Subfamily Colininae A. N. Golikov & Starobogatov, 1987 accepted as Cerithiinae J. Fleming, 1822
Subfamily Probittiinae Bandel, 2006 † (1)
Subfamily Pseudotritoniinae A. N. Golikov & Starobogatov, 1987 † accepted as Pseudotritoniidae A. N. Golikov & Starobogatov, 1987 †
Subfamily Rhinoclavinae Gründel, 1982 accepted as Cerithiinae J. Fleming, 1822
Subfamily Tiaracerithiinae Bouniol, 1981 † accepted as Batillariidae Thiele, 1929
Genus Ashrafiella Nevesskaja, Goncharova & Iljina, 1986 † accepted as Bogatschevia A. A. Ali-Zade & Kabakova, 1969 †
Genus Bogatschevia A. A. Ali-Zade & Kabakova, 1969 †
Genus Chavanicerithium Ludbrook, 1957 † (8)
Genus Conocerithium Sacco, 1895 † (2)
Genus Elassum Woodring, 1946 † accepted as Alabina Dall, 1902
Genus Manulona Ludbrook, 1941 † (2)
Genus Occidentocerithium Nützel, Blodgett & Stanley, 2003 † (1)
Genus Texania K. van W. Palmer, 1937 † accepted as Texmelanatria K. van W. Palmer, 1942 †
Family Cerithioidea incertae sedis (5)
Family Dialidae Kay, 1979 (18)
Family Diastomatidae Cossmann, 1894 (32)
Family Ellipstomatidae Hannibal, 1912 accepted as Pleuroceridae P. Fischer, 1885 (1863)
Family Eustomatidae Cossmann, 1906 † (1)
Family Faxiidae Ravn, 1933 † accepted as Sherborniidae Iredale, 1917
Family Finellidae Thiele, 1929 accepted as Scaliolidae Jousseaume, 1912
Family Fossaridae A. Adams, 1860 accepted as Fossarinae A. Adams, 1860
Family Giraudiidae Bourguignat, 1885 accepted as Hauttecoeuriinae Bourguignat, 1885
Family Glauconiidae Pchelintsev, 1953 † accepted as Cassiopidae Beurlen, 1967 †
Family Hemisinidae P. Fischer & Crosse, 1891 (124)
Family Hilacanthidae Bourguignat, 1886 accepted as Hauttecoeuriinae Bourguignat, 1885
Family Juramelanatriidae Bandel, 2006 † accepted as Thiaridae Gill, 1871 (1823)
Family Ladinulidae Bandel, 1992 † (3)
Family Lavigeriidae Thiele, 1925 accepted as Paludomidae Stoliczka, 1868
Family Limnotrochidae Ancey, 1906 accepted as Hauttecoeuriinae Bourguignat, 1885
Family Litiopidae Gray, 1847 (65)
Family Maoraxidae Bandel, Gründel & P. A. Maxwell, 2000 † (1)
Family Melanatriidae Thiele, 1921 accepted as Pachychilidae P. Fischer & Crosse, 1892
Family Melaniidae Children, 1823 accepted as Thiaridae Gill, 1871 (1823)
Family Melanoididae Ihering, 1909 accepted as Thiaridae Gill, 1871 (1823)
Family Melanopsidae H. Adams & A. Adams, 1854 (430)
Family Modulidae P. Fischer, 1884 (50)
Family Nassopsidae Kesteven, 1903 accepted as Hauttecoeuriinae Bourguignat, 1885
Family Obtortionidae Thiele, 1925 accepted as Scaliolidae Jousseaume, 1912
Family Omalaxidae Cossmann, 1916 † accepted as Omalaxinae Cossmann, 1916 †
Family Pachychilidae P. Fischer & Crosse, 1892 (401)
Family Pachymelaniidae Bandel & Kowalke, 1999 accepted as Hemisinidae P. Fischer & Crosse, 1891
Family Paludomidae Stoliczka, 1868 (152)
Family Paramelaniidae J. E. S. Moore, 1898 accepted as Hauttecoeuriinae Bourguignat, 1885
Family Pelycidiidae Ponder & S. J. Hall, 1983 (17)
Family Pickworthiidae Iredale, 1917 (98)
Family Planaxidae J. E. Gray, 1850 (81)
Family Pleuroceridae P. Fischer, 1885 (1863) (247)
Family Popenellidae Bandel, 1992 † (1)
Family Potadomatidae Pilsbry & Bequaert, 1927 accepted as Pachychilidae P. Fischer & Crosse, 1892
Family Potamididae H. Adams & A. Adams, 1854 (226)
Family Prisciphoridae Bandel, Gründel & P. A. Maxwell, 2000 † accepted as Eumetulinae A. N. Golikov & Starobogatov, 1975
Family Procerithiidae Cossmann, 1906 † (35)
Family Propupaspiridae Nützel, Pan & Erwin, 2002 † (2)
Family Prostyliferidae Bandel, 1992 † (1)
Family Pyrazidae Hacobjan, 1972 accepted as Batillariidae Thiele, 1929
Family Reynellonidae Iredale, 1917 accepted as Pickworthiinae Iredale, 1917
Family Rumellidae Ancey, 1906 accepted as Hauttecoeuriinae Bourguignat, 1885
Family Scaliolidae Jousseaume, 1912 (67)
Family Semisulcospiridae J. P. E. Morrison, 1952 (135)
Family Sherborniidae Iredale, 1917 (2)
Family Siliquariidae Anton, 1838 (57)
Family Spekiidae Ancey, 1906 accepted as Hauttecoeuriinae Bourguignat, 1885
Family Strepomatidae Haldeman, 1864 accepted as Pleuroceridae P. Fischer, 1885 (1863)
Family Styliferinidae Bandel, 1992 accepted as Litiopidae Gray, 1847
Family Syrnolopsidae Bourguignat, 1890 accepted as Hauttecoeuriinae Bourguignat, 1885
Family Telescopiidae J. K. Allan, 1950 accepted as Potamididae H. Adams & A. Adams, 1854
Family Tenagodidae Gill, 1871 accepted as Siliquariidae Anton, 1838
Family Terebrellidae Delpey, 1941 † accepted as Metacerithiidae Cossmann, 1906 †
Family Thiaridae Gill, 1871 (1823) (224)
Family Tiphobiidae Bourguignat, 1886 accepted as Hauttecoeuriinae Bourguignat, 1885
Family Turritellidae Lovén, 1847 (547)
Family Vermiculariidae Dall, 1915 accepted as Turritellinae Lovén, 1847
Family Zardinellopsidae Bandel, 2006 † (2)
Family Zemelanopsidae Neiber & Glaubrecht, 2019 (4)
Subfamily Aylacostomatinae Parodiz, 1969 accepted as Hemisinidae P. Fischer & Crosse, 1891
Subfamily Hemisininae P. Fischer & Crosse, 1891 accepted as Hemisinidae P. Fischer & Crosse, 1891
Superfamily Cerithiopsoidea accepted as Triphoroidea J. E. Gray, 1847
Superfamily Epitonioidea S. S. Berry, 1910 (1812) (1 091)
Superfamily Eulimacea accepted as Eulimoidea R. A. Philippi, 1853
Superfamily Orthonematoidea Nützel & Bandel, 2000 † (107)
Superfamily Palaeostyloidea Wenz, 1938 † (17)
Superfamily Peruneloidea Frýda & Bandel, 1997 † (3)
Superfamily Soleniscoidea Knight, 1931 † (52)
Superfamily Subulitoidea Lindström, 1884 † (11)
Superfamily Triphoroidea J. E. Gray, 1847 (2 157)
Family Acanthonematidae Wenz, 1938 †
Family Ampezzanildidae Bandel, 1994 † (1)
Family Aqabarellidae Alhejoj, Bandel & Al-Najjar, 2016 accepted as Tornidae Sacco, 1896 (1884)
Family Coelostylinidae Cossmann, 1908 † (16)
Family Lyocyclidae Thiele, 1925 (37)
Family Plicatusidae Pan & Erwin, 2002 †
Family Pragoscutulidae Frýda, 1998 †
Family Pseudomelaniidae R. Hoernes, 1884 † (81)
Family Spanionematidae A. N. Golikov & Starobogatov, 1987 †
Family Spirostylidae Cossmann, 1909 †
Family Trajanellidae Pchelintsev, 1951 † accepted as Pseudomelaniidae R. Hoernes, 1884 †
Genus Boreioconus Guzhov, 2015 † (1)
Genus Costasphaera Gründel & Nützel, 2015 † (1)
Genus Dicolpus R. A. Philippi, 1887 †
Genus Nixipileolus Guzhov, 2015 † (1)
Genus Sassenfjordia Kaim, Hryniewicz, C. Little & Nakrem, 2017 † (1)
Genus Spirocyclina Kittl, 1894 † accepted as Spirocyclus Wenz, 1938 †
Genus Spirocyclus Wenz, 1938 †
Order Littorinimorpha (17 171)
Order Neogastropoda (23 713)
Order Stenoglossa accepted as Neogastropoda
Subclass Gastropoda incertae sedis (308)
Subclass Heterobranchia (39 154)
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