Between brackets is the number of accepted species

Click on "-" to collapse/hide all child taxa
Shows the number of accepted species within the taxon
The last expanded taxon is highlighted
Click on "+" to expand/show all child taxa
Click to see the taxon details page
- Mollusca (132 791)
- Subphylum Aculifera
- Subphylum Conchifera
- Subphylum Placophora accepted as Polyplacophora
- Superclass Aplacophora
- Class Amphineura accepted as Aculifera
- Class Bivalvia (25 009)
- Class Caudofoveata (143)
- Class Cephalopoda (1 834)
- Class Conchifera accepted as Bivalvia
- Class Cricoconarida † (1)
- Class Gastropoda (102 697)
- Subclass Amphigastropoda † (390)
- Subclass Angiogastropoda represented as Gastropoda
- Subclass Apogastropoda
- Subclass Caenogastropoda (53 636)
- Subterclass Sorbeoconcha (147)
- Superorder Hypsogastropoda
- Order Architaenioglossa (4 918)
- Order Caenogastropoda incertae sedis (7 676)
- 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)
- 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)
- Genus Aphanistylus P. Fischer, 1884 accepted as Cerithidea Swainson, 1840
- Genus Bittiscala H. J. Finlay & Marwick, 1937 † (3)
- Genus Caballasea DeVries, 2018 † (2)
- Genus Canaliscala Cossmann, 1888 † (1)
- Genus Cerithidea Swainson, 1840 (29)
- Genus Cerithideopsilla Thiele, 1929 accepted as Pirenella J. E. Gray, 1847
- Genus Cerithideopsis Thiele, 1929 (14)
- Genus Dentimides Landau, C. M. Silva & Heitz, 2016 † (1)
- Genus Diplocyma Pilsbry & Olsson, 1935 † (2)
- Genus Diptychochilus Cossmann, 1908 † (6)
- Genus Diptycochilus [sic] † accepted as Diptychochilus Cossmann, 1908 †
- Genus Djeddilia Jousseaume, 1894 accepted as Pirenella J. E. Gray, 1847
- Genus Echinobathra Cossmann, 1906 † (1)
- Genus Eotympanotonus Chavan, 1952 † (13)
- Genus Escoffieria Fontannes, 1880 † accepted as Potamides Brongniart, 1810 †
- Genus Exechestoma Cossmann, 1889 † accepted as Varicipotamides Pacaud & Harzhauser, 2013 †
- Genus Hadraxon Oppenheim, 1892 † (5)
- Genus Harrisianella Olsson, 1929 † (1)
- Genus Menkrawia Beets, 1941 † (1)
- Genus Mesohalina Wittibschlager, 1983 † (1)
- Genus Nodifaunus Olsson, 1944 † (4)
- Genus Phaenommia Mörch, 1860 accepted as Cerithidea Swainson, 1840
- Genus Pirenella J. E. Gray, 1847 (21)
- Species Pirenella alata (R. A. Philippi, 1849)
- Species Pirenella arabica D. Reid, 2016
- Species Pirenella asiatica Ozawa & D. Reid, 2016
- Species Pirenella aspera Švagrovský, 1982 † accepted as Pustulosia submitralis (Eichwald, 1851) †
- Species Pirenella austrocingulata D. Reid, 2015
- Species Pirenella balatonica (Tausch, 1886) †
- Species Pirenella bicincta (Brocchi, 1814) † accepted as Tiarapirenella bicincta (Brocchi, 1814) †
- Species Pirenella binodosa Moisescu, 1992 † accepted as Granulolabium plicatum (Bruguière, 1792) †
- Species Pirenella boswellae Barnard, 1963 accepted as Pseudovertagus clava (Gmelin, 1791)
- Species Pirenella cailliaudi (Potiez & Michaud, 1838) accepted as Pirenella conica (Blainville, 1829)
- Species Pirenella caiyingyai (Z.-X. Qian, Y.-F. Fang & J. He, 2013)
- Species Pirenella cancellata Ozawa & D. Reid, 2016
- Species Pirenella cingulata (Gmelin, 1791)
- Species Pirenella clathrata (A. Adams, 1855) accepted as Royella sinon (Bayle, 1880)
- Species Pirenella conica (Blainville, 1829)
- Subspecies Pirenella conica tricolor Pallary, 1904 accepted as Pirenella conica (Blainville, 1829)
- Variety Pirenella conica var. alba Pallary, 1906 accepted as Pirenella conica (Blainville, 1829)
- Variety Pirenella conica var. atra Pallary, 1906 accepted as Pirenella conica (Blainville, 1829)
- Variety Pirenella conica var. duplicata Pallary, 1906 accepted as Pirenella conica (Blainville, 1829)
- Variety Pirenella conica var. funicula Pallary, 1912 accepted as Pirenella conica (Blainville, 1829)
- Variety Pirenella conica var. fusca Pallary, 1912 accepted as Pirenella conica (Blainville, 1829)
- Variety Pirenella conica var. mairei Pallary, 1938 accepted as Pirenella conica (Blainville, 1829)
- Variety Pirenella conica var. major Pallary, 1912 accepted as Pirenella conica (Blainville, 1829)
- Variety Pirenella conica var. minor Pallary, 1912 accepted as Pirenella conica (Blainville, 1829)
- Variety Pirenella conica var. teilhardi Pallary, 1912 accepted as Pirenella conica (Blainville, 1829)
- Species Pirenella delicatula D. Reid, 2016
- Species Pirenella etrusca (Mayer, 1864) †
- Species Pirenella galidzgensis L. Iljina, 1976 † accepted as Potamides galidzgensis (L. Iljina, 1976) †
- Species Pirenella gamlitzensis (Hilber, 1879) † accepted as Theodisca theodisca (Rolle, 1856) †
- Species Pirenella graeca (Deshayes, 1835) †
- Species Pirenella incisa (Hombron & Jacquinot, 1848)
- Species Pirenella insculpta (G. B. Sowerby II, 1865) accepted as Zeacumantus plumbeus (G. B. Sowerby II, 1855)
- Species Pirenella layardii (A. Adams, 1854) accepted as Pirenella conica (Blainville, 1829)
- Species Pirenella maeotica Kojumdgieva, 1960 accepted as Potamides taitboutii (A. d'Orbigny, 1845) †
- Species Pirenella mammillata J. E. Gray, 1847 accepted as Pirenella conica (Blainville, 1829)
- Species Pirenella microptera (Kiener, 1841)
- Species Pirenella moravica (M. Hörnes, 1855) † accepted as Granulolabium moravicum (M. Hörnes, 1855) †
- Species Pirenella moravicaeformis Papp, 1952 † accepted as Tiarapirenella bicincta (Brocchi, 1814) †
- Species Pirenella nanhaiensis I-F. Fu & D. Reid, 2016
- Species Pirenella nipponica Ozawa & D. Reid, 2016
- Species Pirenella nodosoplicata (M. Hörnes, 1855) † accepted as Pustulosia submitralis (Eichwald, 1851) †
- Species Pirenella picta (Basterot, 1825) † accepted as Tiaracerithium pictum (Basterot, 1825) †
- Species Pirenella pupiformis Ozawa & D. Reid, 2016
- Species Pirenella retifera (G. B. Sowerby II, 1855)
- Species Pirenella rugosa D. Reid, 2016
- Species Pirenella sexanodosa Moisescu, 1992 † accepted as Granulolabium plicatum (Bruguière, 1792) †
- Species Pirenella soceni Jekelius, 1944 † accepted as Tiaracerithium pictum (Basterot, 1825) †
- Species Pirenella subconica (Pallary, 1901) †
- Species Pirenella supracretacea (Tausch, 1886) †
- Genus Potamides Brongniart, 1810 † (41)
- Genus Potamidopsis Munier-Chalmas, 1904 † (1)
- Genus Ptychopotamides Sacco, 1895 † (5)
- Genus Pyrazisinus Heilprin, 1886 † (3)
- Genus Szaboella Bandel & F. Riedel, 1994 † (3)
- Genus Telescopium Montfort, 1810 (3)
- Genus Terebralia Swainson, 1840 (28)
- Genus Theodisca Harzhauser, Guzhov & Landau, 2023 † (4)
- Genus Trempotamides Dominici & Kowalke, 2014 † (3)
- Genus Tympanotomus [sic] accepted as Tympanotonos Schumacher, 1817
- Genus Tympanotonos Schumacher, 1817 (18)
- Genus Tympanotonus Agassiz, 1846 accepted as Tympanotonos Schumacher, 1817
- Genus Typhanotus accepted as Tympanotonos Schumacher, 1817
- Genus Varicipotamides Pacaud & Harzhauser, 2013 † (7)
- Genus Vicarya d'Archiac, 1854 (2)
- Genus Vicaryella Yabe & Hatai, 1938 † (3)
- 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) (1 092)
- 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 (17 179)
- Order Neogastropoda (23 716)
- Order Stenoglossa accepted as Neogastropoda
- Subclass Gastropoda incertae sedis (308)
- Subclass Heterobranchia (39 156)
- 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