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- Mollusca (132 738)
- Subphylum Aculifera
- Subphylum Conchifera
- Subphylum Placophora accepted as Polyplacophora
- Superclass Aplacophora
- Class Amphineura accepted as Aculifera
- Class Bivalvia (24 984)
- Class Caudofoveata (143)
- Class Cephalopoda (1 830)
- Class Conchifera accepted as Bivalvia
- Class Cricoconarida † (1)
- Class Gastropoda (102 673)
- Subclass Amphigastropoda † (387)
- Subclass Angiogastropoda represented as Gastropoda
- Subclass Apogastropoda
- Subclass Caenogastropoda (53 618)
- 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)
- 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)
- Subfamily Gyrotominae Hannibal, 1912 accepted as Pleuroceridae P. Fischer, 1885 (1863)
- Genus Alleghenya Clench & Boss, 1967 accepted as Leptoxis Rafinesque, 1819
- Genus Ambloxus Hannibal, 1912 accepted as Elimia H. Adams & A. Adams, 1854
- Genus Anaplocamus Dall, 1896 accepted as Leptoxis Rafinesque, 1819
- Genus Anculopsis Yen, 1947 † (3)
- Genus Anculosa Say, 1821 accepted as Leptoxis Rafinesque, 1819
- Subgenus Anculosa (Lithasia) Haldeman, 1840 accepted as Lithasia Haldeman, 1840
- Subgenus Anculosa (Mudalia) Haldeman, 1840 accepted as Leptoxis Rafinesque, 1819
- Species Anculosa affinis Haldeman, 1841 accepted as Leptoxis dilatata (Conrad, 1835)
- Species Anculosa aldrichi C. Goodrich, 1922 accepted as Leptoxis coosaensis (I. Lea, 1861)
- Species Anculosa ampla J. G. Anthony, 1855 accepted as Leptoxis ampla (J. G. Anthony, 1855)
- Species Anculosa anthonyi Redfield, 1854 accepted as Athearnia crassa (Haldeman, 1842)
- Species Anculosa arkansensis Hinkley, 1915 accepted as Leptoxis arkansensis (Hinkley, 1915)
- Species Anculosa bella I. Lea, 1841 accepted as Leptoxis plicata (Conrad, 1834)
- Species Anculosa brevispira C. Goodrich, 1922 accepted as Leptoxis coosaensis (I. Lea, 1861)
- Species Anculosa canalifera J. G. Anthony, 1860 accepted as Leptoxis carinata (Bruguière, 1789)
- Species Anculosa carinata I. Lea, 1841 accepted as Leptoxis carinata (Bruguière, 1789)
- Species Anculosa choccoloccoensis C. Goodrich, 1922 accepted as Leptoxis coosaensis (I. Lea, 1861)
- Species Anculosa cincinnatiensis (I. Lea, 1838) accepted as Leptoxis praerosa (Say, 1821)
- Species Anculosa clipeata C. Goodrich, 1922 accepted as Leptoxis clipeata (C. Goodrich, 1922)
- Species Anculosa contorta I. Lea, 1860
- Species Anculosa coosaensis I. Lea, 1861 accepted as Leptoxis coosaensis (I. Lea, 1861)
- Species Anculosa corpulenta J. G. Anthony, 1860 accepted as Leptoxis carinata (Bruguière, 1789)
- Species Anculosa crassa Haldeman, 1842 accepted as Athearnia crassa (Haldeman, 1842)
- Species Anculosa dentata I. Lea, 1841 accepted as Leptoxis carinata (Bruguière, 1789)
- Species Anculosa dilatata (Conrad, 1835) accepted as Leptoxis dilatata (Conrad, 1835)
- Species Anculosa downiei I. Lea, 1868 accepted as Leptoxis foremani (I. Lea, 1843)
- Species Anculosa elegans J. G. Anthony, 1860 accepted as Leptoxis ampla (J. G. Anthony, 1855)
- Species Anculosa flammata I. Lea, 1843 accepted as Leptoxis foremani (I. Lea, 1843)
- Species Anculosa flexuosa C. Goodrich, 1922 accepted as Leptoxis taeniata (Conrad, 1834)
- Species Anculosa foremani I. Lea, 1843 accepted as Leptoxis foremani (I. Lea, 1843)
- Species Anculosa formosa I. Lea, 1860 accepted as Leptoxis formosa (I. Lea, 1860)
- Species Anculosa fusca Haldeman, 1841 accepted as Fluminicola fuscus (Haldeman, 1841)
- Species Anculosa geniculata Haldeman, 1840 accepted as Lithasia geniculata (Haldeman, 1840)
- Species Anculosa gibbosa I. Lea, 1841 accepted as Leptoxis praerosa (Say, 1821)
- Species Anculosa griffithiana I. Lea, 1841 accepted as Leptoxis taeniata (Conrad, 1834)
- Species Anculosa harpethensis Pilsbry, 1896 accepted as Leptoxis praerosa (Say, 1821)
- Species Anculosa incisa I. Lea, 1843 accepted as Gyrotoma excisa (I. Lea, 1843)
- Species Anculosa lewisii I. Lea, 1861 accepted as Lithasia obovata (Say, 1829)
- Species Anculosa ligata J. G. Anthony, 1860 accepted as Leptoxis ligata (J. G. Anthony, 1860)
- Species Anculosa lirata C. Goodrich, 1922 accepted as Leptoxis lirata (C. Goodrich, 1922)
- Species Anculosa littorina Haldeman, 1840 accepted as Leptoxis praerosa (Say, 1821)
- Species Anculosa mimica C. Goodrich, 1922 accepted as Leptoxis ampla (J. G. Anthony, 1855)
- Species Anculosa minor Hinkley, 1912 accepted as Leptoxis minor (Hinkley, 1912)
- Species Anculosa modesta C. Goodrich, 1922 accepted as Leptoxis foremani (I. Lea, 1843)
- Species Anculosa occultata C. Goodrich, 1922 accepted as Leptoxis occultata (C. Goodrich, 1922)
- Species Anculosa ornata J. G. Anthony, 1860
- Species Anculosa patula J. G. Anthony, 1860 accepted as Leptoxis dilatata (Conrad, 1835)
- Species Anculosa picta Conrad, 1834 accepted as Leptoxis picta (Conrad, 1834)
- Species Anculosa planispira C. Goodrich, 1921 accepted as Lithasia obovata (Say, 1829)
- Species Anculosa planulata Wheatley, 1845
- Species Anculosa praerosa (Say, 1821) accepted as Leptoxis praerosa (Say, 1821)
- Species Anculosa rubiginosa I. Lea, 1841 accepted as Leptoxis plicata (Conrad, 1834)
- Species Anculosa showalterii I. Lea, 1860 accepted as Leptoxis showalterii (I. Lea, 1860)
- Species Anculosa smithi C. Goodrich, 1922 accepted as Leptoxis ampla (J. G. Anthony, 1855)
- Species Anculosa solida I. Lea, 1843 accepted as Elimia brevis (I. Lea, 1843)
- Species Anculosa squalida I. Lea, 1845 accepted as Lithasia salebrosa florentiana (I. Lea, 1841)
- Species Anculosa subglobosa (Say, 1825) accepted as Leptoxis praerosa (Say, 1821)
- Species Anculosa sulcata C. Goodrich, 1922 accepted as Leptoxis lirata (C. Goodrich, 1922)
- Species Anculosa taeniata Conrad, 1834 accepted as Leptoxis picta (Conrad, 1834)
- Species Anculosa tintinabulum C. Goodrich, 1940 accepted as Leptoxis praerosa (Say, 1821)
- Species Anculosa tintinnabulum I. Lea, 1845 accepted as Leptoxis praerosa (Say, 1821)
- Species Anculosa torrefacta C. Goodrich, 1922 accepted as Leptoxis torrefacta (C. Goodrich, 1922)
- Species Anculosa troostiana I. Lea, 1841 accepted as Leptoxis dilatata (Conrad, 1835)
- Species Anculosa tryoni J. Lewis, 1871 accepted as Leptoxis praerosa (Say, 1821)
- Species Anculosa tuberculata I. Lea, 1841 accepted as Leptoxis plicata (Conrad, 1834)
- Species Anculosa turbinata I. Lea, 1861 accepted as Leptoxis crassa (Haldeman, 1842)
- Species Anculosa turgida Haldeman, 1840 accepted as Leptoxis melanoides (Conrad, 1834)
- Species Anculosa umbilicata Wetherby, 1876 accepted as Leptoxis umbilicata (Wetherby, 1876)
- Species Anculosa variabilis I. Lea, 1841 accepted as Leptoxis carinata (Bruguière, 1789)
- Species Anculosa viridula J. G. Anthony, 1860 accepted as Leptoxis dilatata (Conrad, 1835)
- Species Anculosa vittata I. Lea, 1860 accepted as Leptoxis vittata (I. Lea, 1860)
- Species Anculosa zebra J. G. Anthony, 1860 accepted as Leptoxis foremani (I. Lea, 1843)
- Genus Anculotus Conrad, 1834 accepted as Anculosa Say, 1821
- Genus Ancylotus Herrmannsen, 1846 accepted as Anculosa Say, 1821
- Genus Angitrema Haldeman, 1841 accepted as Lithasia Haldeman, 1840
- Genus Athearnia J. P. E. Morrison, 1971 (2)
- Genus Carbonispira Yen, 1949 † (1)
- Genus Cassiopella C. A. White, 1877 † (2)
- Genus Ceriphasia Swainson, 1840 accepted as Pleurocera Rafinesque, 1818
- Genus Circamelania Yen, 1951 † (1)
- Genus Elimia H. Adams & A. Adams, 1854 (111)
- Genus Ellipstoma Rafinesque, 1818 accepted as Lithasia Haldeman, 1840
- Genus Eurycaelon I. Lea, 1864 accepted as Lithasia Haldeman, 1840
- Genus Goniobasis I. Lea, 1862 accepted as Elimia H. Adams & A. Adams, 1854 (50)
- Genus Gyrotoma Shuttleworth, 1845 (6)
- Genus Io I. Lea, 1831 (1)
- Genus Leptoxis Rafinesque, 1819 (25)
- Genus Lithasia Haldeman, 1840 (14)
- Genus Lithasiopsis Pilsbry, 1910 (4)
- Genus Macrolimen I. Lea, 1863 accepted as Elimia H. Adams & A. Adams, 1854
- Genus Melafusus Swainson, 1840
- Genus Melasma H. Adams & A. Adams, 1854 accepted as Elimia H. Adams & A. Adams, 1854
- Genus Meseschiza I. Lea, 1864 accepted as Lithasia Haldeman, 1840
- Genus Mudalia Haldeman, 1840 accepted as Leptoxis Rafinesque, 1819
- Genus Oxymelania Crosse & P. Fischer, 1892 accepted as Pachychilus (Oxymelania) Crosse & P. Fischer, 1892
- Genus Oxytrema Rafinesque, 1819 accepted as Pleurocera Rafinesque, 1818
- Genus Pleurocera Rafinesque, 1818 (27)
- Genus Pleuroceras Cossmann, 1909 accepted as Pleurocera Rafinesque, 1818
- Genus Pleurocerus accepted as Pleurocera Rafinesque, 1818
- Genus Schizocheilus P. Fischer, 1885 accepted as Gyrotoma Shuttleworth, 1845
- Genus Schizochilus I. Lea, 1852 accepted as Gyrotoma Shuttleworth, 1845
- Genus Schizostoma I. Lea, 1843 accepted as Gyrotoma Shuttleworth, 1845
- Genus Strephobasis I. Lea, 1861 accepted as Pleurocera Rafinesque, 1818
- Genus Strepoma Haldeman, 1864 accepted as Pleurocera Rafinesque, 1818
- Genus Telescopella Gray, 1847 accepted as Pleurocera Rafinesque, 1818
- Genus Trypanostoma I. Lea, 1862 accepted as Pleurocera Rafinesque, 1818
- 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 (17 166)
- Order Neogastropoda (23 713)
- Order Stenoglossa accepted as Neogastropoda
- Subclass Gastropoda incertae sedis (308)
- Subclass Heterobranchia (39 153)
- 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