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)
- Subclass Gastropoda incertae sedis (308)
- Subclass Heterobranchia (39 156)
- Infraclass "Lower Heterobranchia" (1 137)
- Infraclass Euthyneura (37 433)
- Subterclass Acteonimorpha (411)
- Subterclass Ringipleura (2 917)
- Subterclass Tectipleura (34 105)
- Superorder Acochlidiimorpha (48)
- Superorder Ascoglossa accepted as Sacoglossa
- Superorder Basommatophora accepted as Hygrophila
- Superorder Eupulmonata (25 569)
- Order Aillyida accepted as Achatinina
- Order Ellobiida (579)
- Order Gymnomorpha accepted as Systellommatophora
- Order Stylommatophora (24 766)
- Suborder Achatinina (2 900)
- Suborder Elasmognatha accepted as Succineoidei
- Suborder Helicina (21 626)
- Infraorder Arionoidei (140)
- Infraorder Clausilioidei (1 859)
- Superfamily Clausilioidea J. E. Gray, 1855 (1 859)
- Family Clausiliidae J. E. Gray, 1855 (1 762)
- Family Filholiidae Wenz, 1923 † (82)
- Genus Eobulimites Astre, 1923 † accepted as Filholia Bourguignat, 1877 †
- Genus Filholia Bourguignat, 1877 † (4)
- Genus Milneedwardsia Bourguignat, 1877 † accepted as Triptychia F. Sandberger, 1875 †
- Genus Triptychia F. Sandberger, 1875 † (78)
- Subgenus Triptychia (Eutriptychia) O. Boettger, 1877 † accepted as Triptychia F. Sandberger, 1875 †
- Species Triptychia (Eutriptychia) ampla K. Fischer & Wenz, 1916 † accepted as Triptychia ampla K. Fischer & Wenz, 1916 †
- Species Triptychia (Eutriptychia) conoidea K. Fischer & Wenz, 1916 † accepted as Triptychia conoidea K. Fischer & Wenz, 1916 †
- Species Triptychia (Eutriptychia) emmerichi Wenz, 1912 † accepted as Triptychia emmerichi Wenz, 1912 †
- Species Triptychia (Eutriptychia) gracilitesta K. Fischer & Wenz, 1916 † accepted as Triptychia gracilitesta K. Fischer & Wenz, 1916 †
- Subgenus Triptychia (Milneedwardsia) Bourguignat, 1877 † accepted as Triptychia F. Sandberger, 1875 †
- Subgenus Triptychia (Mioptychia) Wenz, 1920 † accepted as Milneedwardsia Bourguignat, 1877 †
- Subgenus Triptychia (Plioptychia) O. Boettger, 1877 † accepted as Triptychia F. Sandberger, 1875 †
- Subgenus Triptychia (Triptychia) F. Sandberger, 1875 † represented as Triptychia F. Sandberger, 1875 †
- Species Triptychia ampla K. Fischer & Wenz, 1916 †
- Species Triptychia antiqua (Zieten, 1832) †
- Species Triptychia antiquior (K. Miller, 1907) †
- Species Triptychia bacillifera (F. Sandberger, 1875) †
- Species Triptychia bavarica Wenz, 1934 †
- Species Triptychia beaumonti (Haime, 1855) †
- Species Triptychia boettgeri Lörenthey, 1906 †
- Species Triptychia bourguignati (Locard, 1883) †
- Species Triptychia catalanica H. Nordsieck, 2020 †
- Species Triptychia chiae Almera & Bofill y Poch, 1892 †
- Species Triptychia clava (F. Sandberger, 1875) †
- Species Triptychia conoidea K. Fischer & Wenz, 1916 †
- Species Triptychia densicostulata (F. Sandberger, 1871) †
- Species Triptychia deshayesi (Bourguignat, 1877) †
- Species Triptychia dolium Schnabel, 2006 †
- Species Triptychia ederae H. Binder, 2004 †
- Species Triptychia edwardsi H. Nordsieck, 1985 †
- Species Triptychia emmerichi Wenz, 1912 †
- Species Triptychia emyphila Sacco, 1886 †
- Species Triptychia escheri (F. Sandberger, 1875) †
- Species Triptychia fragilis Schnabel, 2006 †
- Species Triptychia gaali Schnabel, 2006 †
- Species Triptychia gebennica (Fontannes, 1884) †
- Species Triptychia geisserti H. Nordsieck, 1974 †
- Species Triptychia gracilis H. Binder, 2002 †
- Species Triptychia gracilitesta K. Fischer & Wenz, 1916 †
- Species Triptychia grandis (Klein, 1846) † accepted as Triptychia kleini Schnabel, 2006 †
- Species Triptychia hassiaca (O. Boettger, 1877) †
- Species Triptychia helvetica (F. Sandberger, 1875) † accepted as Triptychia mayeri H. Nordsieck, 1998 †
- Species Triptychia hungarica Halaváts, 1923 †
- Species Triptychia kadolskyi Schnabel, 2007 †
- Species Triptychia kleini Schnabel, 2006 †
- Species Triptychia laaensis Schnabel, 2006 †
- Species Triptychia lageti Truc, 1972 †
- Species Triptychia lartetii (Dupuy, 1850) †
- Species Triptychia leobersdorfensis (Troll, 1907) †
- Species Triptychia limbata (F. Sandberger, 1875) †
- Species Triptychia luegeri Schnabel, 2006 †
- Species Triptychia lugdunensis Schnabel, 2006 †
- Species Triptychia margaretae Andreae, 1904 †
- Species Triptychia martinii Schnabel, 2007 †
- Species Triptychia mastodontofila (Sismonda, 1852) †
- Species Triptychia mastodontophila [sic] † accepted as Triptychia mastodontofila (Sismonda, 1852) †
- Species Triptychia maxima (Grateloup, 1828) †
- Species Triptychia mayeri H. Nordsieck, 1998 †
- Species Triptychia mediterranea Käufel, 1928 †
- Species Triptychia molassica (O. Boettger, 1877) †
- Species Triptychia muelleri H. Nordsieck, 1984 †
- Species Triptychia neudeggensis Schnabel, 2006 †
- Species Triptychia nordsiecki Schnabel, 2006 †
- Species Triptychia norica Schnabel, 2006 †
- Species Triptychia obliquiplicata (F. Sandberger, 1875) †
- Species Triptychia oligocaenica (K. Miller, 1907) †
- Species Triptychia pachecoi (Thomas Doménech, 1954) †
- Species Triptychia pappi Schnabel, 2006 †
- Species Triptychia peneckei Schlosser, 1907 †
- Species Triptychia procera Schnabel, 2006 †
- Species Triptychia pulchra Schnabel, 2006 †
- Species Triptychia randeckensis [sic] † accepted as Triptychia randeckiana (Kranz, 1908) †
- Species Triptychia randeckiana (Kranz, 1908) †
- Species Triptychia recticosta (O. Boettger, 1877) †
- Species Triptychia reinensis Schnabel, 2006 †
- Species Triptychia rouxi (Noulet, 1868) †
- Species Triptychia sarmatica Kókay, 2006 †
- Species Triptychia schlickumi H. Nordsieck, 1972 †
- Species Triptychia schuetti Schnabel, 2006 †
- Species Triptychia schultzi Lueger, 1981 †
- Species Triptychia sinistrorsa (de Serres, 1841) † accepted as Triptychia clava (F. Sandberger, 1875) †
- Species Triptychia solida Schnabel, 2006 †
- Species Triptychia splendida Schnabel, 2006 †
- Species Triptychia steinheimensis (Quenstedt, 1884) †
- Species Triptychia steiningeri Schnabel, 2006 †
- Species Triptychia styriaca Schnabel, 2006 †
- Species Triptychia suevica (F. Sandberger, 1875) †
- Species Triptychia suturalis (F. Sandberger, 1872) † accepted as Triptychia steinheimensis (Quenstedt, 1884) †
- Species Triptychia szontaghi Schnabel, 2006 †
- Species Triptychia terveri [sic] † accepted as Triptychia terverii (Michaud, 1855) †
- Species Triptychia terverii (Michaud, 1855) †
- Species Triptychia teutonica Schnabel, 2006 †
- Species Triptychia tomerdingensis Kadolsky, 2020 †
- Species Triptychia ulmensis (F. Sandberger, 1875) †
- Species Triptychia vulgata (Reuss, 1849) †
- Species Triptychia weinsteigensis Schnabel, 2006 †
- Species Triptychia wenzi Schnabel, 2006 †
- Species Triptychia zoebeleini Schnabel, 2006 †
- Family Palaeostoidae H. Nordsieck, 1986 † (15)
- Infraorder Helicina incertae sedis (3 210)
- Infraorder Helicoidei (5 690)
- Infraorder Limacoidei (4 251)
- Infraorder Oleacinoidei (497)
- Infraorder Orthalicoidei (1 578)
- Infraorder Partuloinei accepted as Pupilloidei
- Infraorder Pupilloidei (3 436)
- Infraorder Rhytidoidei (581)
- Infraorder Sagdoinei accepted as Helicoidei
- Infraorder Succineoidei (384)
- Suborder Orthurethra accepted as Pupilloidei
- Suborder Scolodontina (165)
- Suborder Sigmurethra accepted as Helicina
- Suborder Stylommatophora incertae sedis (75)
- Order Systellommatophora (224)
- Superorder Hygrophila (2 005)
- Superorder Pneumopulmonata
- Superorder Pylopulmonata (4 285)
- Superorder Sacoglossa (391)
- Superorder Siphonarimorpha (163)
- Order Anaspidea accepted as Aplysiida
- Order Aplysiida (101)
- Order Aplysiomorpha accepted as Aplysiida
- Order Archaeopulmonata accepted as Siphonarioidea Gray, 1827
- Order Bullomorpha accepted as Cephalaspidea
- Order Cephalaspidea (1 034)
- Order Heterostropha accepted as Pyramidellidae J. E. Gray, 1840
- Order Pteropoda (414)
- Order Runcinacea accepted as Runcinida
- Order Runcinida (80)
- Order Tectibranchiata
- Order Thecosomata
- Order Umbraculida (15)
- Superorder Euthyneura incertae sedis
- Infraclass Heterobranchia incertae sedis (478)
- Infraclass Mesoneura (108)
- Infraclass Opisthobranchia
- Infraclass Pulmonata
- 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