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- Mollusca (133 260)
- Subphylum Aculifera
- Subphylum Conchifera
- Subphylum Placophora accepted as Polyplacophora
- Superclass Aplacophora
- Class Amphineura accepted as Aculifera
- Class Bivalvia (25 078)
- Class Caudofoveata (143)
- Class Cephalopoda (1 917)
- Class Conchifera accepted as Bivalvia
- Class Cricoconarida † (1)
- Class Gastropoda (103 009)
- Subclass Amphigastropoda † (434)
- Subclass Angiogastropoda represented as Gastropoda
- Subclass Apogastropoda
- Subclass Caenogastropoda (53 818)
- Subterclass Sorbeoconcha (147)
- Superorder Hypsogastropoda
- Order Architaenioglossa (4 921)
- Order Caenogastropoda incertae sedis (7 691)
- Suborder Heteroglossa
- Suborder Ptenoglossa
- Superfamily Abyssochrysoidea Tomlin, 1927 (104)
- Superfamily Acteoninoidea Cossmann, 1895 †
- Superfamily Campaniloidea (290)
- Superfamily Cerithioidea J. Fleming, 1822 (3 708)
- 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)
- 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 (227)
- 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 (548)
- Subfamily Omalaxinae Cossmann, 1916 † (9)
- Subfamily Orectospirinae Habe, 1955 (2)
- Subfamily Pareorinae H. J. Finlay & Marwick, 1937 (50)
- Subfamily Protominae Marwick, 1957 (13)
- Subfamily Tachyrhynchinae A. N. Golikov, 1986 accepted as Turritellinae Lovén, 1847
- Subfamily Turritellinae Lovén, 1847 (470)
- Genus Aculea Perry, 1810 † accepted as Haustator Montfort, 1810
- Genus Archimediella Sacco, 1895 (7)
- Genus Armatus A. N. Golikov, 1986 (1)
- Genus Asiella Kryachkova, 1969 † (1)
- Genus Banzarecolpus A. W. B. Powell, 1957 (2)
- Genus Broderiptella Olsson, 1964 (1)
- Genus Callostracum E. A. Smith, 1909
- Genus Calvertitella Petuch, 1988 † (2)
- Genus Caucasella Hacobjan, 1969 †
- Genus Caviturritella Friend & B. M. Anderson, 2023 (10)
- Genus Colposigma H. J. Finlay & Marwick, 1937 † (7)
- Genus Colpospira J. Donald, 1900 (35)
- Genus Colpospirella A. W. B. Powell, 1951 (1)
- Genus Costacolpus Marwick, 1966 † accepted as Turritelloidea Walther, 1951 †
- Genus Cristispira Allison, 1965 † (3)
- Genus Ctenocolpus Iredale, 1925 accepted as Colpospira J. Donald, 1900
- Genus Eichwaldiella Friedberg, 1933 † accepted as Oligodia Handmann, 1882 †
- Genus Gazameda Iredale, 1924 (12)
- Genus Haustator Montfort, 1810 (44)
- Subgenus Haustator (Kurosioia) Ida, 1952 † accepted as Turritella Lamarck, 1799
- Species Haustator (Kurosioia) gilletti Garrard, 1974 accepted as Turritella martensi Selli, 1974
- Species Haustator (Kurosioia) leeuwinensis Garrard, 1972 accepted as Turritella leeuwinensis (Garrard, 1972)
- Species Haustator adulteratus (Deshayes, 1861) †
- Species Haustator altavillensis (Cossmann & Pissarro, 1902) †
- Species Haustator armenicus Pchelintsev, 1954 †
- Species Haustator ashtamudensis Harzhauser, 2014 †
- Species Haustator ataciana (A. d'Orbigny, 1850) † accepted as Haustator atacianus (A. d'Orbigny, 1850) †
- Species Haustator atacianus (A. d'Orbigny, 1850) †
- Species Haustator bauga (A. d'Orbigny, 1842) †
- Species Haustator bellovacinus (Deshayes, 1861) †
- Species Haustator beyrichi (Hofmann, 1870) †
- Species Haustator caillati (Deshayes, 1861) †
- Species Haustator circumdatus (Deshayes, 1861) †
- Species Haustator comptus (Deshayes, 1861) †
- Species Haustator contractus (J. De C. Sowerby, 1850) †
- Species Haustator dalidagensis Pchelintsev, 1954 †
- Species Haustator desmarestinus (Basterot, 1825) † accepted as Turritella desmarestina Basterot, 1825 †
- Species Haustator differencialis Pchelintsev, 1953 † accepted as Turritella choffati P. Thomas & A. Péron, 1889 †
- Species Haustator dixoni (Deshayes, 1861) †
- Species Haustator djirmanissensis Pchelintsev, 1954 †
- Species Haustator doukantensis (Brébion, 1955) †
- Species Haustator elegans (Deshayes, 1861) †
- Species Haustator elongatus (J. Sowerby, 1814) †
- Species Haustator ferganensis Pchelintsev, 1953 †
- Species Haustator funiculosus (Deshayes, 1832) †
- Species Haustator gallicus Montfort, 1810 † accepted as Haustator imbricatarius (Lamarck, 1804) †
- Species Haustator granulosa (Deshayes, 1832) † accepted as Haustator granulosus (Deshayes, 1832) †
- Species Haustator granulosus (Deshayes, 1832) †
- Species Haustator imbricatarius (Lamarck, 1804) †
- Species Haustator incrassata (J. Sowerby, 1814) †
- Species Haustator interpositus (Deshayes, 1861) †
- Species Haustator kurdistanensis Pchelintsev, 1953 †
- Species Haustator kysylkumensis Pchelintsev, 1953 †
- Species Haustator lamarckii (Defrance, 1828) †
- Species Haustator mitis (Deshayes, 1861) †
- Species Haustator monilifer (Deshayes, 1832) †
- Species Haustator multiplicatus Pchelintsev, 1954 †
- Species Haustator parisi (Stilwell, Zinsmeister & Oleinik, 2004) †
- Species Haustator peraubensis (Cossmann, 1906) †
- Species Haustator pitniakensis Pchelintsev, 1953 † accepted as Turritella pitniakensis (Pchelintsev, 1953) †
- Species Haustator quadrilira (C. W. Johnson, 1898) † accepted as Turritella quadrilira C. W. Johnson, 1898 †
- Species Haustator sedanensis (K. Martin, 1905) †
- Species Haustator slanskyi (Brébion, 1955) †
- Species Haustator solanderi (Mayer-Eymar, 1876) †
- Species Haustator somovitensis Tzankov, 1940 †
- Species Haustator striatellatus Sacco, 1895 † accepted as Helminthia striatellata (Sacco, 1895) †
- Species Haustator subarchiaci Pchelintsev, 1953 †
- Species Haustator subfittoni Pchelintsev, 1953 † accepted as Torquesiella subfittoni (Pchelintsev, 1953) †
- Species Haustator submorgani Pchelintsev, 1953 †
- Species Haustator subtrivigiana (Moret, 1938) †
- Species Haustator subula (Deshayes, 1832) †
- Species Haustator supracretacea (A. d'Orbigny, 1850) †
- Species Haustator tauroperturritus (Sacco, 1895) †
- Species Haustator teschi (K. Martin, 1916) †
- Species Haustator tokodensis (Strausz, 1966) †
- Species Haustator trilira (Conrad, 1860) †
- Species Haustator trisulcata (Lamarck, 1822) accepted as Turritella trisulcata Lamarck, 1822
- Species Haustator uchauxiensis (A. d'Orbigny, 1842) † accepted as Torquesiella uchauxiana (A. d'Orbigny, 1842) †
- Species Haustator uniangularis (Lamarck, 1804) †
- Species Haustator unisulcatus (Lamarck, 1804) †
- Species Haustator variegata (Linnaeus, 1758) accepted as Turritella variegata (Linnaeus, 1758)
- Genus Helminthia Handmann, 1882 (7)
- Genus Incatella DeVries, 2007 (6)
- Genus Kapalmerella Allmon, 2005 † (2)
- Genus Maoricolpus H. J. Finlay, 1926 (10)
- Genus Mariacolpus Petuch, 1988 † (2)
- Genus Nairiella Hacobjan, 1969 † (3)
- Genus Neohaustator Ida, 1952 (3)
- Genus Nodosella Hacobjan, 1969 † (1)
- Genus Oligodia Handmann, 1882 † (5)
- Genus Palmerella Allmon, 1996 † accepted as Kapalmerella Allmon, 2005 †
- Genus Peyrotia Cossmann, 1912 † (1)
- Genus Platycolpus J. Donald, 1900 accepted as Colpospira J. Donald, 1900
- Genus Proto Blainville, 1824 accepted as Turritella Lamarck, 1799
- Genus Ptychidia Handmann, 1882 † (5)
- Genus Roamerella S. K. Donovan & van den Hoek Ostende, 2013 † (1)
- Genus Roemerella Hacobjan, 1969 † accepted as Roamerella S. K. Donovan & van den Hoek Ostende, 2013 †
- Genus Smithia Maltzan, 1883 accepted as Callostracum E. A. Smith, 1909
- Genus Spirocolpus H. J. Finlay, 1926 † (6)
- Genus Stiracolpus H. J. Finlay, 1926 (14)
- Genus Tachyrhinchella Titova, 1994 †
- Genus Tachyrhinchus accepted as Tachyrhynchus Mörch, 1868
- Genus Tachyrhynchus Mörch, 1868 (15)
- Genus Tachyrynchus Mörch, 1868 accepted as Tachyrhynchus Mörch, 1868
- Genus Torcula J. E. Gray, 1847 (1)
- Genus Torculoidella Sacco, 1895 † accepted as Oligodia Handmann, 1882 †
- Genus Torquesia H. Douvillé, 1929 † (7)
- Genus Torquesiella Pchelintsev, 1969 † (2)
- Genus Tropicolpus Marwick, 1931 † (14)
- Genus Turitela [sic] accepted as Turritella Lamarck, 1799
- Genus Turitella [sic] accepted as Turritella Lamarck, 1799
- Genus Turritella Lamarck, 1799 (191)
- Genus Turritellinella Harzhauser & Landau, 2019 (3)
- Genus Vermicularia Lamarck, 1799 (20)
- Genus Vermiculus Lister, 1688 accepted as Vermicularia Lamarck, 1799
- Genus Vermiculus Mörch, 1859 accepted as Vermicularia Lamarck, 1799
- Genus Viennella Harzhauser & Landau, 2019 † (3)
- Genus Zaria J. E. Gray, 1847 accepted as Turritella Lamarck, 1799
- Genus Zeacolpus H. J. Finlay, 1926 (22)
- Subfamily Vermiculariinae Dall, 1913 accepted as Turritellinae Lovén, 1847
- Subfamily Zariinae Gray, 1850 accepted as Turritellidae Lovén, 1847
- Tribe Zeacolpini Marwick, 1971 accepted as Turritellinae Lovén, 1847
- Genus Arcotia Stoliczka, 1868 † (2)
- Genus Leptocolpus H. J. Finlay & Marwick, 1937 † (1)
- Genus Trobus Stephenson, 1955 † (1)
- 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) (1 103)
- 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 (17 231)
- Order Neogastropoda (23 828)
- Order Stenoglossa accepted as Neogastropoda
- Subclass Gastropoda incertae sedis (313)
- Subclass Heterobranchia (39 225)
- Subclass Neomphaliones accepted as Vetigastropoda
- Subclass Neritimorpha (1 916)
- Subclass Orthogastropoda represented as Gastropoda
- Subclass Patellogastropoda (514)
- Subclass Prosobranchia
- Subclass Psilogastropoda represented as Gastropoda
- Subclass Vetigastropoda (6 789)
- 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 (1 381)
- Class Polyplaxiphora accepted as Polyplacophora
- Class Rostroconchia † (64)
- Class Scaphopoda (753)
- Class Solenoconchia accepted as Scaphopoda
- Class Solenogastres (313)
- Subclass Chaetodermomorpha accepted as Caudofoveata