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)
- Infraclass Euthyneura (37 457)
- Subterclass Acteonimorpha (411)
- Subterclass Ringipleura (2 917)
- Subterclass Tectipleura (34 129)
- Superorder Acochlidiimorpha (48)
- Superorder Ascoglossa accepted as Sacoglossa
- Superorder Basommatophora accepted as Hygrophila
- Superorder Eupulmonata (25 591)
- Order Aillyida accepted as Achatinina
- Order Ellobiida (579)
- Order Gymnomorpha accepted as Systellommatophora
- Order Stylommatophora (24 788)
- Suborder Achatinina (2 912)
- Suborder Elasmognatha accepted as Succineoidei
- Suborder Helicina (21 636)
- Infraorder Arionoidei (140)
- Infraorder Clausilioidei (1 859)
- Infraorder Helicina incertae sedis (3 210)
- Infraorder Helicoidei (5 691)
- Infraorder Limacoidei (4 251)
- Infraorder Oleacinoidei (497)
- Infraorder Orthalicoidei (1 587)
- Infraorder Partuloinei accepted as Pupilloidei
- Infraorder Pupilloidei (3 436)
- Superfamily Achatinelloidea Gulick, 1873 accepted as Pupilloidea W. Turton, 1831
- Superfamily Azecoidea H. Watson, 1920 (44)
- Superfamily Chondrinoidea Steenberg, 1925 (183)
- Family Chondrinidae Steenberg, 1925 (106)
- Family Truncatellinidae Steenberg, 1925 (77)
- Genus Columella Westerlund, 1878 (16)
- Genus Franzia Blume, 1965 accepted as Truncatellina R. T. Lowe, 1852
- Genus Laurinella P. Hesse, 1915 accepted as Truncatellina R. T. Lowe, 1852
- Genus Negulus O. Boettger, 1889 (5)
- Genus Truncatellina R. T. Lowe, 1852 (56)
- Species Truncatellina adami van Bruggen, 1994
- Species Truncatellina algoviana Colling & Karle-Fendt, 2016
- Species Truncatellina arboricola Tattersfield, 1995
- Species Truncatellina arcyensis W. Klemm, 1943 accepted as Truncatellina cylindrica (A. Férussac, 1807)
- Species Truncatellina asirensis Hausdorf & Wronski, 2011
- Species Truncatellina atomus (Shuttleworth, 1852)
- Species Truncatellina ayubiana Auffenberg & Pokryszko, 2009
- Species Truncatellina babusarica Auffenberg & Pokryszko, 2009
- Species Truncatellina beckmanni Quintana, 2010
- Species Truncatellina belokrysi Prysjazhnjuk, 1978 †
- Species Truncatellina bhutanensis E. Gittenberger, Pema Leda & Sherub Sherub, 2013
- Species Truncatellina biscoitoi Hutterer & Groh, 1993 †
- Species Truncatellina blanfordi (Jickeli, 1874)
- Species Truncatellina brandti Zilch, 1960
- Species Truncatellina callicratis (Scacchi, 1833)
- Species Truncatellina cameroni Triantis & Pokryszko, 2004
- Species Truncatellina claustralis (Gredler, 1856)
- Species Truncatellina costulata (Nilsson, 1823)
- Species Truncatellina cryptodonta (A. Braun, 1851) †
- Species Truncatellina cryptodus (F. Sandberger, 1858) † accepted as Truncatellina cryptodonta (A. Braun, 1851) †
- Species Truncatellina cylindrica (A. Férussac, 1807)
- Species Truncatellina dentata Steklov, 1966 †
- Species Truncatellina dilatata T. Yu, 2020 † accepted as Euthema dilatata (T.-T. Yu, 2020) †
- Species Truncatellina dilatatus T.-T. Yu, 2020 † accepted as Euthema dilatata (T.-T. Yu, 2020) †
- Species Truncatellina dysorata (Melvill & Ponsonby, 1893)
- Species Truncatellina flavogilva Germain, 1934
- Species Truncatellina haasi Venmans, 1957
- Species Truncatellina himalayana (W. H. Benson, 1863)
- Species Truncatellina insulivaga (Pilsbry & Hirase, 1904)
- Species Truncatellina iota (Melvill & Ponsonby, 1894)
- Species Truncatellina janinensis Pilsbry, 1925 accepted as Truncatellina cylindrica (A. Férussac, 1807)
- Species Truncatellina laeviuscula (Küster, 1850)
- Species Truncatellina lardea (Jickeli, 1874)
- Species Truncatellina lentilii (K. Miller, 1900) †
- Species Truncatellina linearis (R. T. Lowe, 1852)
- Species Truncatellina lussinensis Štamol, 1995
- Species Truncatellina maresquelli Fischer-Piette, C. P. Blanc, F. Blanc & Salvat, 1994
- Species Truncatellina micra (Ping, 1929) †
- Species Truncatellina molecula (Dohrn, 1869)
- Species Truncatellina monodon (Held, 1837)
- Species Truncatellina mutandaensis (Preston, 1913) accepted as Truncatellina naivashaensis (Preston, 1911)
- Species Truncatellina naivashaensis (Preston, 1911)
- Species Truncatellina ninagongonis (Pilsbry, 1935)
- Species Truncatellina obesa Adam, 1954
- Species Truncatellina opisthodon (Reinhardt, 1879)
- Species Truncatellina pantherae Harzhauser & Neubauer, 2014 †
- Species Truncatellina perplexa (Burnup, 1908)
- Species Truncatellina podolica (Łomnicki, 1886) †
- Species Truncatellina portosantana Hutterer & Groh, 1993 †
- Species Truncatellina prainhana Hutterer & Groh, 1993 †
- Species Truncatellina pretoriensis (Melvill & Ponsonby, 1893)
- Species Truncatellina purpuraria Hutterer & Groh, 1993
- Species Truncatellina pygmaeorum (Pilsbry & T. D. A. Cockerell, 1933)
- Subspecies Truncatellina pygmaeorum katangae Adam, 1954 accepted as Truncatellina pygmaeorum (Pilsbry & T. D. A. Cockerell, 1933)
- Species Truncatellina quantula (Melvill & Ponsonby, 1893)
- Species Truncatellina rivierana (W. H. Benson, 1854) accepted as Truncatellina callicratis (Scacchi, 1833)
- Species Truncatellina rothi (Reinhardt, 1916) accepted as Truncatellina cylindrica (A. Férussac, 1807)
- Species Truncatellina ruwenzoriensis Adam, 1957
- Species Truncatellina schilleri (Jickeli, 1874)
- Species Truncatellina silvicola de Winter, 1990
- Species Truncatellina similis (Jickeli, 1874)
- Species Truncatellina splendidula (F. Sandberger, 1875) †
- Species Truncatellina strobeli (Gredler, 1853) accepted as Truncatellina callicratis (Scacchi, 1833)
- Species Truncatellina subrothi Schütt, 1994 †
- Species Truncatellina suprapontica Wenz & Edlauer, 1942 †
- Species Truncatellina sykesii (Melvill & Ponsonby, 1893)
- Species Truncatellina taurica Prysjazhnjuk, 1978 †
- Species Truncatellina tauricola Lindholm, 1926 accepted as Truncatellina cylindrica (A. Férussac, 1807)
- Species Truncatellina thomensis D. T. Holyoak & G. A. Holyoak, 2020
- Species Truncatellina uniarmata (Küster, 1856)
- Species Truncatellina upembae Adam, 1954
- Species Truncatellina velkovrhi Štamol, 1995
- Superfamily Cionelloidea L. Pfeiffer, 1879 accepted as Cochlicopoidea Pilsbry, 1900 (1879)
- Superfamily Cochlicopoidea Pilsbry, 1900 (1879) accepted as Pupilloidea W. Turton, 1831
- Superfamily Dendropupoidea Wenz, 1938 † (11)
- Superfamily Enoidea B. B. Woodward, 1903 (1880) accepted as Pupilloidea W. Turton, 1831
- Superfamily Orculoidea Pilsbry, 1918 accepted as Pupilloidea W. Turton, 1831
- Superfamily Partuloidea Pilsbry, 1900 accepted as Pupilloidea W. Turton, 1831
- Superfamily Pupilloidea W. Turton, 1831 (3 198)
- Superfamily Vertiginoidea Fitzinger, 1833 accepted as Pupilloidea W. Turton, 1831
- 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 (1 036)
- 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 (6 783)
- 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
