Between brackets is the number of accepted species

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- Mollusca (132 888)
- Subphylum Aculifera
- Subphylum Conchifera
- Subphylum Placophora accepted as Polyplacophora
- Superclass Aplacophora
- Class Amphineura accepted as Aculifera
- Class Bivalvia (25 022)
- Class Caudofoveata (143)
- Class Cephalopoda (1 838)
- Class Conchifera accepted as Bivalvia
- Class Cricoconarida † (1)
- Class Gastropoda (102 777)
- Subclass Amphigastropoda † (396)
- Subclass Angiogastropoda represented as Gastropoda
- Subclass Apogastropoda
- Subclass Caenogastropoda (53 684)
- Subclass Gastropoda incertae sedis (309)
- Subclass Heterobranchia (39 180)
- Infraclass "Lower Heterobranchia" (1 137)
- Superfamily Architectonicoidea J. E. Gray, 1850 (262)
- Superfamily Cimoidea Warén, 1993 (114)
- Superfamily Ectobranchia P. Fischer, 1884 accepted as Valvatoidea Gray, 1840
- Superfamily Mathildoidea Dall, 1889 (260)
- Family Gordenellidae Gründel, 2000 † (63)
- Family Mathildidae Dall, 1889 (196)
- Subfamily Turritellopsinae Marwick, 1957 accepted as Mathildidae Dall, 1889
- Genus Acrocoelum Cossmann, 1888 † (4)
- Genus Angulathilda Gründel & Nützel, 2013 † (9)
- Genus Bandelthilda Gründel, 1997 † (1)
- Species Bandelthilda cassiana (Bandel, 1995) †
- Genus Bathraspira Cossmann, 1906 † (4)
- Genus Brookesena H. J. Finlay, 1926 (6)
- Genus Carinathilda Gründel, 1997 † (3)
- Genus Clathrobaculus Cossmann, 1912 † accepted as Promathildia Andreae, 1887 †
- Genus Echinimathilda Sohl, 1960 † (4)
- Genus Eomathilda H. J. Finlay & Marwick, 1937 † (1)
- Genus Erratothilda Gründel, 1997 † (4)
- Genus Eucharilda Iredale, 1929 accepted as Mathilda O. Semper, 1865
- Genus Fimbriatella Sacco, 1895 (2)
- Genus Gegania Jeffreys, 1884 accepted as Tuba I. Lea, 1833 (1)
- Genus Granulicharilda Kuroda & T. Habe, 1971 accepted as Mathilda O. Semper, 1865
- Genus Gymnothilda M. Schröder, 1995 † (5)
- Genus Jurilda Gründel, 1973 † (5)
- Genus Kaitangata H. J. Finlay & Marwick, 1937 † accepted as Gegania Jeffreys, 1884
- Genus Lemniscolittorina Sohl, 1960 † (2)
- Genus Mathilda O. Semper, 1865 (98)
- Genus Mathildia Bosquet, 1869 accepted as Mathilda O. Semper, 1865
- Genus Mathildona Iredale, 1929 accepted as Mathilda O. Semper, 1865
- Genus Opimilda Iredale, 1929 accepted as Mathilda O. Semper, 1865 (1)
- Genus Pseudalaria Hudleston, 1889 † (2)
- Genus Pseudotuba Harzhauser & Landau, 2023 † (6)
- Genus Tangarilda Gründel, 2010 † (1)
- Genus Teretrina Cossmann, 1912 † (1)
- Genus Tricarilda Gründel, 1973 † (9)
- Genus Tuba I. Lea, 1833 (16)
- Genus Tubena Marwick, 1943 accepted as Gegania Jeffreys, 1884
- Genus Turritellopsis G. O. Sars, 1878 (9)
- Genus Valsantia Ludbrook, 1957 † (1)
- Genus Veterator Laws, 1944 † (1)
- Family Schartiidae Nützel & Kaim, 2014 †
- Family Trachoecidae Bandel, 1994 † (1)
- Family Tubidae Finlay & Marwick, 1937 accepted as Mathildidae Dall, 1889
- Superfamily Omalogyroidea G. O. Sars, 1878 (74)
- Superfamily Orbitestelloidea Iredale, 1917 (64)
- Superfamily Valvatoidea Gray, 1840 (363)
- Infraclass Euthyneura (37 457)
- 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 (6 783)
- 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