Between brackets is the number of accepted species
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- Mollusca (132 754)
- Subphylum Aculifera
- Subphylum Conchifera
- Subphylum Placophora accepted as Polyplacophora
- Superclass Aplacophora
- Class Amphineura accepted as Aculifera
- Class Bivalvia (24 992)
- Class Caudofoveata (143)
- Class Cephalopoda (1 832)
- Class Conchifera accepted as Bivalvia
- Class Cricoconarida † (1)
- Class Gastropoda (102 679)
- Subclass Amphigastropoda † (387)
- Subclass Angiogastropoda represented as Gastropoda
- Subclass Apogastropoda
- Subclass Caenogastropoda (53 623)
- Subclass Gastropoda incertae sedis (308)
- Subclass Heterobranchia (39 154)
- Infraclass "Lower Heterobranchia" (1 137)
- Infraclass Euthyneura (37 431)
- Subterclass Acteonimorpha (411)
- Subterclass Ringipleura (2 917)
- Subterclass Tectipleura (34 103)
- Superorder Acochlidiimorpha (48)
- Superorder Ascoglossa accepted as Sacoglossa
- Superorder Basommatophora accepted as Hygrophila
- Superorder Eupulmonata (25 567)
- Order Aillyida accepted as Achatinina
- Order Ellobiida (579)
- Order Gymnomorpha accepted as Systellommatophora
- Order Stylommatophora (24 764)
- Suborder Achatinina (2 899)
- Suborder Elasmognatha accepted as Succineoidei
- Suborder Helicina (21 625)
- Infraorder Arionoidei (140)
- Infraorder Clausilioidei (1 859)
- Infraorder Helicina incertae sedis (3 210)
- Infraorder Helicoidei (5 690)
- Infraorder Limacoidei (4 250)
- Superfamily Dyakioidea Gude & B. B. Woodward, 1921 accepted as Trochomorphoidea Mörch, 1864
- Superfamily Gastrodontoidea Tryon, 1866 (621)
- Superfamily Helicarionoidea Bourguignat, 1877 (1 862)
- Family Ariophantidae Godwin-Austen, 1883 (739)
- Family Girasiidae Collinge, 1902 accepted as Girasiini Collinge, 1902
- Family Gudeoconchidae Iredale, 1944 accepted as Helicarionidae Bourguignat, 1877
- Family Helicarionidae Bourguignat, 1877 (650)
- Subfamily Durgellinae Godwin-Austen, 1888 (283)
- Subfamily Helicarioninae Bourguignat, 1877 (360)
- Genus Amenixesta Iredale, 1941 (2)
- Genus Amphiblema Gude, 1911 accepted as Kalidos Gude, 1911
- Genus Antiquarion J. Stanisic, 2010 (8)
- Genus Ariocaelatura Germain, 1921 accepted as Plegma Gude, 1911
- Genus Attenborougharion Hyman & Köhler, 2017 (1)
- Genus Aulacopus Pfeffer, 1878 accepted as Orpiella J. E. Gray, 1855
- Genus Bathia G. C. Robson, 1914 (1)
- Genus Brevisentis Hyman, 2007 (3)
- Genus Burnettia J. Stanisic, 2010 (2)
- Genus Caelatura auctt. accepted as Coelatura L. Pfeiffer, 1877
- Genus Caldwellia H. Adams, 1873 (5)
- Genus Chalepotaxis Ancey, 1887 (2)
- Genus Coelatura L. Pfeiffer, 1877 accepted as Plegma Gude, 1911
- Genus Colmanarion J. Stanisic, 2010 (2)
- Genus Ctenoglypta Ancey, 1904 (1)
- Genus Ctenophila Ancey, 1882 (6)
- Genus Cucullarion J. Stanisic, 1998 (2)
- Genus Cycliscus Gude, 1911 accepted as Harmogenanina Germain, 1918
- Genus Dancea Zilch, 1960 (3)
- Genus Delinitesta Iredale, 1933 (1)
- Genus Dendronitor Iredale, 1933 (1)
- Genus Desidarion Iredale, 1941 accepted as Parmavitrina Iredale, 1937
- Genus Dimidarion J. Stanisic, 2010 accepted as Fastosarion Iredale, 1933
- Genus Dupontia Godwin-Austen, 1908 (9)
- Genus Echonitor Iredale, 1937 (3)
- Genus Eddiella J. Stanisic, 2010 (4)
- Genus Einasleighana J. Stanisic, 2010 (2)
- Genus Elatonitor J. Stanisic, 2010 (2)
- Genus Ellarion Iredale, 1941 (1)
- Genus Epiglypta Pilsbry, 1893 (1)
- Genus Erepta Albers, 1850 (7)
- Genus Eufretum H. B. Baker, 1941 (3)
- Genus Eungarion J. Stanisic, 1993 accepted as Fastosarion Iredale, 1933
- Genus Expocystis Iredale, 1937 (6)
- Genus Fastosarion Iredale, 1933 (21)
- Genus Fenestrarion J. Stanisic, 2010 (1)
- Genus Fijia Gude, 1913 (2)
- Genus Geminitor Hyman & Köhler, 2022 (5)
- Genus Gudeoconcha Iredale, 1944 (1)
- Genus Harmogenanina Germain, 1918 (6)
- Genus Helecarion A. Férussac, 1821 accepted as Helicarion A. Férussac, 1821
- Genus Helicarion A. Férussac, 1821 (8)
- Genus Howearion Iredale, 1944 (2)
- Genus Hunsteinia Iredale, 1941 accepted as Zagmena Iredale, 1941
- Genus Hymanarion J. Stanisic, 2010 accepted as Fastosarion Iredale, 1933
- Genus Irenella Gude, 1913 (5)
- Genus Kalidos Gude, 1911 (121)
- Genus Laconia J. E. Gray, 1855 accepted as Helicarion A. Férussac, 1821
- Genus Laocaia Kuzminykh, 1999 (3)
- Genus Levidens Hyman, 2007 (1)
- Genus Limpidarion Hyman & Köhler, 2020 (1)
- Species Limpidarion kukuyulangi Hyman & Köhler, 2020
- Genus Luinarion Iredale, 1933 accepted as Helicarion A. Férussac, 1821
- Genus Macularion J. Stanisic, 2010 accepted as Stanisicarion Hyman & Ponder, 2010
- Genus Malandena Iredale, 1933 accepted as Elatonitor J. Stanisic, 2010
- Genus Melocystis Iredale, 1937 accepted as Nitor Gude, 1911
- Genus Methuenia accepted as Methvenia G. C. Robson, 1914
- Genus Methvenia G. C. Robson, 1914 accepted as Kalidos Gude, 1911
- Genus Microstylodonta Germain, 1921 accepted as Erepta Albers, 1850
- Genus Mistarion Iredale, 1941 (1)
- Genus Modonitor Iredale, 1937 accepted as Nitor Gude, 1911
- Genus Montanocystis J. Stanisic, 2010 (1)
- Genus Mysticarion Iredale, 1941 (4)
- Genus Nesonanina C. R. Boettger, 1918 (1)
- Genus Nitor Gude, 1911 (12)
- Genus Owaraha H. B. Baker, 1941 represented as Orpiella (Owaraha) H. B. Baker, 1941
- Genus Pachystyla Mörch, 1852 (3)
- Genus Palmervillea J. Stanisic, 2010 (1)
- Genus Parmacochlea E. A. Smith, 1884 (4)
- Genus Parmavitrina Iredale, 1937 (6)
- Genus Parmella H. Adams, 1867 (1)
- Genus Parmellops Iredale, 1944 (2)
- Genus Peloparion Iredale, 1937 (1)
- Genus Periclocystis Iredale, 1937 (1)
- Genus Petalochlamys Godwin-Austen, 1907 (3)
- Genus Plegma Gude, 1911 (2)
- Genus Pravonitor Iredale, 1937 (8)
- Genus Propebloyetia Germain, 1913 accepted as Kalidos Gude, 1911
- Genus Pseudocaelatura Wenz, 1947 accepted as Dancea Zilch, 1960
- Genus Pseudophasis Germain, 1918 (1)
- Genus Pseudosaphtia de Winter, 2008 (1)
- Genus Pseudosesara Solem, 1962 (1)
- Genus Quirosella Clench, 1958 (3)
- Genus Rotula Albers, 1850 accepted as Harmogenanina Germain, 1918
- Genus Saphtia de Winter, 2008 (3)
- Genus Sheaia Hyman, 2007 (1)
- Genus Sigaloeista Shea & O. L. Griffiths, 2010 (7)
- Genus Sitalarion H. B. Baker, 1941 (1)
- Genus Stanisicarion Hyman & Ponder, 2010 (3)
- Genus Sundavitrina B. Rensch, 1932 accepted as Vitrinopsis C. Semper, 1873
- Genus Suterella Iredale, 1915 accepted as Oxychilus Fitzinger, 1833
- Genus Tachyphasis Germain, 1918 accepted as Ctenophila Ancey, 1882
- Genus Taiwanosiphona T. Habe, 1943 accepted as Chalepotaxis Ancey, 1887
- Genus Tarocystis Iredale, 1937 (8)
- Genus Thalassia E. von Martens, 1860 accepted as Nitor Gude, 1911
- Genus Thularion J. Stanisic, 1993 (2)
- Genus Torrecystis J. Stanisic, 2010 (1)
- Genus Tropicystis J. Stanisic, 2010 (1)
- Genus Urazirochlamys T. Habe, 1946 (1)
- Genus Vanmolia de Winter, 2008 (1)
- Genus Vercularion Iredale, 1933 accepted as Fastosarion Iredale, 1933
- Genus Westracystis Iredale, 1939 (2)
- Genus Zagmena Iredale, 1941 (17)
- Genus Apothapsia D. T. Holyoak & G. A. Holyoak, 2020 (2)
- Genus Dendrolamellaria Preston, 1913 (1)
- Genus Fanulum Iredale, 1913 accepted as Diastole Gude, 1913
- Genus Helixarion A. Férussac, 1821 accepted as Helicarion A. Férussac, 1821
- Genus Kermarion Iredale, 1944 (1)
- Genus Nevelasta Iredale, 1937 accepted as Coneuplecta Möllendorff, 1893
- Genus Ovachlamys T. Habe, 1946 (2)
- Genus Ubiquitarion Hyman, Lamborena & Köhler, 2017 (1)
- Family Myotestidae Collinge, 1902 accepted as Ostracolethinae Simroth, 1901
- Family Urocyclidae Simroth, 1889 (467)
- Genus Pilula E. von Martens, 1898 (3)
- Genus Sagdellina Cossmann, 1889 † (3)
- Superfamily Limacoidea Batsch, 1789 (364)
- Superfamily Limacoidei incertae sedis (3)
- Superfamily Parmacelloidea P. Fischer, 1856 (1855)
- Superfamily Trochomorphoidea Mörch, 1864 (1 190)
- Superfamily Zonitoidea Mörch, 1864 (118)
- Family Milacidae Ellis, 1926 (55)
- Family Parmacellidae P. Fischer, 1856 (1855) (26)
- Family Trigonochlamydidae Hesse, 1882 (11)
- 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
