Between brackets is the number of accepted species
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- 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)
- Order Neogastropoda (23 716)
- Superfamily Buccinoidea Rafinesque, 1815 (5 253)
- Superfamily Cancellarioidea Forbes & Hanley, 1851 accepted as Volutoidea Rafinesque, 1815
- Superfamily Conoidea J. Fleming, 1822 (8 674)
- Superfamily Mitroidea Swainson, 1831 (633)
- Superfamily Muricacea accepted as Muricoidea Rafinesque, 1815
- Superfamily Muricoidea Rafinesque, 1815 (2 940)
- Superfamily Neogastropoda incertae sedis (296)
- Superfamily Olivoidea Latreille, 1825 (740)
- Superfamily Pholidotomoidea Cossmann, 1896 † (55)
- Superfamily Pseudolivoidea De Gregorio, 1880 accepted as Olivoidea Latreille, 1825
- Superfamily Pyrifusoidea Bandel & Dockery, 2001 † accepted as Pholidotomoidea Cossmann, 1896 †
- Superfamily Sarganoidea Stephenson, 1923 † accepted as Pholidotomoidea Cossmann, 1896 †
- Superfamily Toxoglossa Troschel, 1848 accepted as Conoidea J. Fleming, 1822
- Superfamily Turbinelloidea Swainson, 1835 (1 252)
- Superfamily Volutoidea Rafinesque, 1815 (3 873)
- Family Cancellariidae Forbes & Hanley, 1851 (855)
- Family Cystiscidae W. Stimpson, 1865 (552)
- Subfamily Canalispirinae Fedosov, Caballer & Bouchet, 2019 (27)
- Genus Baroginella Laseron, 1957 accepted as Canalispira Jousseaume, 1875
- Genus Canalispira Jousseaume, 1875 (15)
- Species Canalispira attentia (Laseron, 1957)
- Species Canalispira aurea E. F. Garcia, 2006
- Species Canalispira columellaria F. Boyer, 2018
- Species Canalispira fallax (E. A. Smith, 1903)
- Species Canalispira fluctuata McCleery & Wakefield, 2007 accepted as Osvaldoginella fluctuata (McCleery & Wakefield, 2007)
- Species Canalispira gomezi (Espinosa & Ortea, 1997) accepted as Osvaldoginella gomezi Espinosa & Ortea, 1997
- Species Canalispira hoffi (Moolenbeek & Faber, 1991) accepted as Osvaldoginella hoffi (Moolenbeek & Faber, 1991)
- Species Canalispira incommoda (Ludbrook, 1958) †
- Species Canalispira indrai (Beets, 1941) †
- Species Canalispira infirma (Laseron, 1957)
- Species Canalispira kerni E. F. García, 2007
- Species Canalispira lipei E. F. García, 2007
- Species Canalispira minor (Dall, 1927)
- Species Canalispira olivellaeformis Jousseaume, 1875
- Species Canalispira ornata McCleery & Wakefield, 2007 accepted as Osvaldoginella ornata (McCleery & Wakefield, 2007)
- Species Canalispira phantasia McCleery & Wakefield, 2007 accepted as Osvaldoginella phantasia (McCleery & Wakefield, 2007)
- Species Canalispira replicata (Melvill, 1912)
- Species Canalispira shacklefordi (Preston, 1915)
- Species Canalispira umuhlwa Kilburn, 1990
- Species Canalispira yemanjae F. Boyer, Crabos & Queiroz, 2024
- Genus Osvaldoginella Espinosa & Ortea, 1997 (12)
- Subfamily Cystiscinae W. Stimpson, 1865 (485)
- Subfamily Persiculinae G. A. Coovert & H. K. Coovert, 1995 accepted as Cystiscinae W. Stimpson, 1865
- Subfamily Plesiocystiscinae G. A. Coovert & H. K. Coovert, 1995 (40)
- Genus Dentiginella Laseron, 1957 accepted as Gibberula Swainson, 1840
- Genus Lataginella Laseron, 1957 † accepted as Gibberula Swainson, 1840
- Genus Persicola [sic] accepted as Persicula Schumacher, 1817
- Genus Topaginella Laseron, 1957 †
- Genus Vetaginella Laseron, 1957 accepted as Gibberula Swainson, 1840
- Family Granulinidae G. A. Coovert & H. K. Coovert, 1995 (152)
- Family Marginellidae J. Fleming, 1828 (1 444)
- Family Marginellonidae Coan, 1965 (4)
- Family Paladmetidae Stephenson, 1941 † accepted as Admetinae Troschel, 1865
- Family Plesiocystiscidae G. A. Coovert & H. K. Coovert, 1995 accepted as Plesiocystiscinae G. A. Coovert & H. K. Coovert, 1995
- Family Volutidae Rafinesque, 1815 (866)
- 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
