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)
- Order Littorinimorpha (17 179)
- Superfamily Calyptraeoidea Lamarck, 1809 (203)
- Superfamily Capuloidea J. Fleming, 1822 (218)
- Superfamily Cassoidea accepted as Tonnoidea Suter, 1913 (1825)
- Superfamily Cingulopsoidea Fretter & Patil, 1958 (193)
- Superfamily Crepiduloidea J. Fleming, 1822 accepted as Calyptraeoidea Lamarck, 1809
- Superfamily Cypraeoidea Rafinesque, 1815 (1 285)
- Superfamily Eulimoidea R. A. Philippi, 1853 accepted as Vanikoroidea Gray, 1840
- Superfamily Ficoidea Meek, 1864 (1840) (71)
- Superfamily Heteropoda Lamarck, 1812 accepted as Pterotracheoidea Rafinesque, 1814
- Superfamily Hipponicoidea Troschel, 1861 (99)
- Superfamily Littorinoidea Children, 1834 (1 372)
- Superfamily Naticoidea Guilding, 1834 (688)
- Superfamily Pterotracheoidea Rafinesque, 1814 (63)
- Superfamily Rissoacea accepted as Rissooidea Gray, 1847
- Superfamily Rissoinoidea W. Stimpson, 1865 accepted as Rissooidea Gray, 1847
- Superfamily Rissooidea Gray, 1847 (2 311)
- Superfamily Stromboidea Rafinesque, 1815 (835)
- Superfamily Tonnoidea Suter, 1913 (1825) (788)
- Family Aquillidae Pilsbry, 1904 accepted as Cymatiidae Iredale, 1913 (1854)
- Family Bursidae Thiele, 1925 (89)
- Family Calcarellidae Schaufuss, 1869 accepted as Personidae Gray, 1854
- Family Cassidae Latreille, 1825 (254)
- Subfamily Cassinae Latreille, 1825 (140)
- Subfamily Oocorythinae P. Fischer, 1885 accepted as Cassinae Latreille, 1825
- Subfamily Phaliinae Beu, 1981 (113)
- Genus Antephalium Iredale, 1927 (5)
- Genus Bathygalea Woodring & Olsson, 1957 accepted as Echinophoria Sacco, 1890
- Genus Bezoardica Schumacher, 1817 accepted as Phalium Link, 1807
- Genus Bezoardicella Habe, 1961 accepted as Phalium Link, 1807
- Genus Casmaria H. Adams & A. Adams, 1853 (14)
- Genus Echinophoria Sacco, 1890 (28)
- Genus Euspinacassis H. J. Finlay, 1926 accepted as Echinophoria Sacco, 1890
- Genus Faurotis Jousseaume, 1888 accepted as Semicassis Mörch, 1852
- Genus Phalium Link, 1807 (13)
- Genus Semicassis Mörch, 1852 (53)
- Subgenus Semicassis (Antephalium) Iredale, 1927 accepted as Antephalium Iredale, 1927
- Subgenus Semicassis (Casmaria) H. Adams & A. Adams, 1853 accepted as Casmaria H. Adams & A. Adams, 1853
- Subgenus Semicassis (Kahua) Marwick, 1928 † represented as Semicassis Mörch, 1852
- Subgenus Semicassis (Semicassis) Mörch, 1852 represented as Semicassis Mörch, 1852
- Subgenus Semicassis (Tylocassis) Woodring, 1928 accepted as Semicassis Mörch, 1852
- Subgenus Semicassis (Xenophalium) Iredale, 1927 accepted as Semicassis (Semicassis) Mörch, 1852
- Species Semicassis adcocki (G. B. Sowerby III, 1896) accepted as Antephalium adcocki (G. B. Sowerby III, 1896)
- Species Semicassis aldrichi (Dall, 1890) †
- Species Semicassis anceps A. Adams, 1853
- Species Semicassis angasi (Iredale, 1927)
- Species Semicassis anteniana (K. Martin, 1931) †
- Species Semicassis bisulcata (Schubert & J. A. Wagner, 1829)
- Species Semicassis bondarevi Mühlhäusser & Parth, 1993
- Species Semicassis bulla T. Habe, 1961
- Species Semicassis canaliculata (Bruguière, 1792)
- Species Semicassis centiquadrata (Valenciennes, 1832)
- Species Semicassis cicatricosa (Gmelin, 1791) accepted as Semicassis granulata (Born, 1778)
- Species Semicassis craticulata (Euthyme, 1885)
- Species Semicassis decipiens (Kilburn, 1980)
- Species Semicassis delibrata (Moroni, 1966) †
- Species Semicassis diuturna Iredale, 1927
- Species Semicassis dorae (Kreipl & Mühlhäusser, 1996)
- Species Semicassis dougthorni Dekkers, 2013
- Species Semicassis dumasi Cossmann & Peyrot, 1924 † accepted as Semicassis grateloupi (Deshayes, 1853) †
- Species Semicassis faurotis (Jousseaume, 1888)
- Species Semicassis fernandesi (Kilburn, 1975)
- Species Semicassis fibrata (P. Marshall & Murdoch, 1920) †
- Species Semicassis gibba (Gmelin, 1791) accepted as Semicassis granulata (Born, 1778)
- Species Semicassis glabrata (Dunker, 1852)
- Species Semicassis granulata (Born, 1778)
- Subspecies Semicassis granulata granulata (Born, 1778) accepted as Semicassis granulata (Born, 1778)
- Subspecies Semicassis granulata undulata (Gmelin, 1791) accepted as Semicassis undulata (Gmelin, 1791)
- Species Semicassis grateloupi (Deshayes, 1853) †
- Species Semicassis iheringi (Carcelles, 1953)
- Species Semicassis inornata (Pilsbry, 1895)
- Species Semicassis japonica (Reeve, 1848) accepted as Semicassis bisulcata (Schubert & J. A. Wagner, 1829)
- Species Semicassis jauberti Cossmann & Peyrot, 1924 † accepted as Cassis major Grateloup, 1834 †
- Species Semicassis kaawaensis (Bartrum & A. W. B. Powell, 1928) †
- Species Semicassis labiata (G. Perry, 1811)
- Species Semicassis laevigata (Defrance, 1817) †
- Species Semicassis lilliei (C. A. Fleming, 1943) †
- Species Semicassis marcusi Garvie, 2013 †
- Species Semicassis marwicki (C. A. Fleming, 1943) †
- Species Semicassis microstoma (E. von Martens, 1904)
- Species Semicassis miodiadema Sacco, 1908 †
- Species Semicassis miolaevigata (Sacco, 1890) accepted as Semicassis saburon (Bruguière, 1792)
- Species Semicassis muelleri Tate, 1889 † accepted as Antephalium semigranosum (Lamarck, 1822)
- Species Semicassis neumayri (R. Hoernes, 1875) †
- Species Semicassis obscura T. Habe, 1961 accepted as Semicassis bulla T. Habe, 1961
- Species Semicassis pauciruge [sic] accepted as Semicassis paucirugis (Menke, 1843)
- Species Semicassis paucirugis (Menke, 1843)
- Species Semicassis persimilis Kira, 1959 accepted as Semicassis bisulcata (Schubert & J. A. Wagner, 1829)
- Species Semicassis pila (Reeve, 1848) accepted as Semicassis bisulcata (Schubert & J. A. Wagner, 1829)
- Species Semicassis poustagnacensis Lozouet & Lesport, 2024 †
- Species Semicassis pyrum (Lamarck, 1822)
- Species Semicassis radiata Tate, 1889 † accepted as Casmaria radiata (Tate, 1889) †
- Species Semicassis reclusa (Guppy, 1873) †
- Species Semicassis reklawensis (Garvie, 1996) †
- Species Semicassis rembangensis (K. Martin, 1899) † accepted as Phalium rembangensis (K. Martin, 1899) †
- Species Semicassis reticulata (Bellardi & Michelotti, 1840) †
- Species Semicassis royana (Iredale, 1914)
- Species Semicassis saburon (Bruguière, 1792)
- Species Semicassis salmonea Beu, Bouchet & Tröndlé, 2012 accepted as Semicassis bulla T. Habe, 1961
- Species Semicassis semigranosa (Lamarck, 1822) accepted as Antephalium semigranosum (Lamarck, 1822)
- Species Semicassis senni (Rutsch, 1934) †
- Species Semicassis sinuosa (Verco, 1904)
- Species Semicassis skinneri (Marwick, 1928) †
- Species Semicassis sophia (Brazier, 1872)
- Species Semicassis subgranosa Tate, 1889 † accepted as Antephalium semigranosum (Lamarck, 1822)
- Species Semicassis subsulcosa (R. Hoernes & Auinger, 1884) †
- Species Semicassis sufflata (Tenison Woods, 1877) † accepted as Antephalium sufflatum (Tenison Woods, 1877) †
- Species Semicassis szilviae Z. Kovács & Vicián, 2018 †
- Species Semicassis thachi Kreipl, Alf & Eggeling, 2006
- Species Semicassis thomsoni (Brazier, 1876)
- Species Semicassis transenna Tate, 1889 † accepted as Antephalium transennum (Tate, 1889) †
- Species Semicassis trinodosa Tate, 1889 † accepted as Echinophoria trinodosa (Tate, 1889) †
- Species Semicassis umbgrovei (K. Martin, 1931) †
- Species Semicassis umbilicata (Pease, 1861)
- Species Semicassis undulata (Gmelin, 1791)
- Species Semicassis vandervlerki (K. Martin, 1933) † accepted as Echinophoria vandervlerki (K. Martin, 1933) †
- Species Semicassis vavakuana Ladd, 1934 † accepted as Phalium areola (Linnaeus, 1758)
- Species Semicassis westralis Kreipl, 1997
- Species Semicassis whitworthi (Abbott, 1968)
- Species Semicassis zeylanica (Lamarck, 1822)
- Genus Trachydolium Howe, 1926 † accepted as Echinophoria Sacco, 1890
- Genus Tylocassis Woodring, 1928 accepted as Semicassis Mörch, 1852
- Genus Xenogalea Iredale, 1927 accepted as Semicassis Mörch, 1852
- Genus Xenophalium Iredale, 1927 accepted as Semicassis Mörch, 1852
- Genus Morionassa Sacco, 1890 †
- Genus Sconsodolium Beu, 2005 † (1)
- Family Charoniidae A. W. B. Powell, 1933 (14)
- Family Cymatiidae Iredale, 1913 (1854) (297)
- Family Distorsioninae Beu, 1981 accepted as Personidae Gray, 1854
- Family Doliidae Latreille, 1825 accepted as Tonnidae Suter, 1913 (1825)
- Family Eosassiidae Bandel & Dockery, 2012 † accepted as Cymatiidae Iredale, 1913 (1854) (1)
- Family Galeodoliidae Sacco, 1891 accepted as Tonnidae Suter, 1913 (1825)
- Family Lampusiidae R. B. Newton, 1891 accepted as Cymatiidae Iredale, 1913 (1854)
- Family Laubierinidae Warén & Bouchet, 1990 (12)
- Family Lotoriidae G. F. Harris, 1897 accepted as Cymatiidae Iredale, 1913 (1854)
- Family Macgillivrayiidae H. Adams & A. Adams, 1854 accepted as Tonnidae Suter, 1913 (1825)
- Family Mataxidae Bandel & Dockery, 2012 † (2)
- Family Nyctilochidae Dall, 1912 accepted as Cymatiidae Iredale, 1913 (1854)
- Family Oocorythidae P. Fischer, 1885 accepted as Cassidae Latreille, 1825
- Family Personidae Gray, 1854 (42)
- Family Ranellidae Gray, 1854 (21)
- Family Septidae Dall & C. T. Simpson, 1901 accepted as Cymatiidae Iredale, 1913 (1854)
- Family Simpulidae Dautzenberg, 1900 accepted as Cymatiidae Iredale, 1913 (1854)
- Family Thalassocyonidae F. Riedel, 1995 (5)
- Family Tonnidae Suter, 1913 (1825) (51)
- Family Tritoniidae H. Adams & A. Adams, 1853 accepted as Ranellidae Gray, 1854
- Subfamily Personinae Gray, 1854 accepted as Personidae Gray, 1854
- Superfamily Truncatelloidea J. E. Gray, 1840 (6 902)
- Superfamily Vanikoroidea Gray, 1840 (1 331)
- Superfamily Velutinoidea Gray, 1840 (648)
- Superfamily Vermetoidea Rafinesque, 1815 (172)
- Superfamily Xenophoroidea Troschel, 1852 (1840) accepted as Stromboidea Rafinesque, 1815
- 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