Between brackets is the number of accepted species

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- Mollusca (132 927)
- Subphylum Aculifera
- Subphylum Conchifera
- Subphylum Placophora accepted as Polyplacophora
- Superclass Aplacophora
- Class Amphineura accepted as Aculifera
- Class Bivalvia (25 030)
- Class Caudofoveata (143)
- Class Cephalopoda (1 845)
- Class Conchifera accepted as Bivalvia
- Class Cricoconarida † (1)
- Class Gastropoda (102 801)
- Subclass Amphigastropoda † (404)
- Subclass Angiogastropoda represented as Gastropoda
- Subclass Apogastropoda
- Subclass Caenogastropoda (53 703)
- Subclass Gastropoda incertae sedis (309)
- Subclass Heterobranchia (39 177)
- Infraclass "Lower Heterobranchia" (1 137)
- Infraclass Euthyneura (37 454)
- Subterclass Acteonimorpha (411)
- Subterclass Ringipleura (2 917)
- Subterclass Tectipleura (34 126)
- Superorder Acochlidiimorpha (48)
- Superorder Ascoglossa accepted as Sacoglossa
- Superorder Basommatophora accepted as Hygrophila
- Superorder Eupulmonata (25 588)
- Order Aillyida accepted as Achatinina
- Order Ellobiida (579)
- Order Gymnomorpha accepted as Systellommatophora
- Order Stylommatophora (24 785)
- Suborder Achatinina (2 912)
- Suborder Elasmognatha accepted as Succineoidei
- Suborder Helicina (21 633)
- Infraorder Arionoidei (140)
- Infraorder Clausilioidei (1 859)
- Infraorder Helicina incertae sedis (3 210)
- Superfamily Coelociontoidea Iredale, 1937 (5)
- Superfamily Discoidea Thiele, 1931 (159)
- Superfamily Papillodermatoidea Wiktor, R. Martin & Castillejo, 1990 (1)
- Superfamily Plectopyloidea Möllendorff, 1898 (144)
- Superfamily Punctoidea E. S. Morse, 1864 (1 630)
- Family Charopidae F. W. Hutton, 1884 (1 118)
- Family Cystopeltidae T. D. A. Cockerell, 1891 (34)
- Family Dipnelicidae Iredale, 1937 accepted as Charopidae F. W. Hutton, 1884
- Family Endodontidae Pilsbry, 1895 (225)
- Family Flammulinidae Crosse, 1895 accepted as Flammulininae Crosse, 1895
- Family Gonyodiscidae A. J. Wagner, 1928 accepted as Discidae Thiele, 1931 (1866)
- Family Hedleyoconchidae Iredale, 1942 accepted as Charopidae F. W. Hutton, 1884
- Family Helicodiscidae Pilsbry, 1927 (37)
- Family Laomidae Suter, 1913 accepted as Punctidae E. S. Morse, 1864
- Family Oopeltidae T. D. A. Cockerell, 1891 (11)
- Family Paralaomidae Iredale, 1941 accepted as Punctidae E. S. Morse, 1864
- Family Patulastridae Steenberg, 1925 accepted as Punctidae E. S. Morse, 1864
- Family Patulidae Tryon, 1866 accepted as Discidae Thiele, 1931 (1866)
- Family Phenacohelicidae Suter, 1892 accepted as Charopinae F. W. Hutton, 1884
- Family Pseudocharopidae Iredale, 1944 accepted as Charopidae F. W. Hutton, 1884
- Family Punctidae E. S. Morse, 1864 (203)
- Subfamily Laominae Suter, 1913 (159)
- Genus Allenella Iredale, 1944 (3)
- Genus Allentula Iredale, 1958 accepted as Allenella Iredale, 1944
- Genus Charopinesta Iredale, 1944 (3)
- Genus Christianoconcha Iredale, 1945 (2)
- Genus Dignamoconcha Iredale, 1944 (1)
- Genus Goweriana Shea & O. L. Griffiths, 2010 (1)
- Genus Gratilaoma Iredale, 1939 (4)
- Genus Iotula Iredale, 1941 (1)
- Genus Kaputaresta J. Stanisic, 2010 (1)
- Genus Kokikora Climo & Goulstone, 1995 (2)
- Genus Kokopapa Climo & Mahlfeld, 2012 (6)
- Genus Laoma J. E. Gray, 1850 (8)
- Genus Laomarex A. W. B. Powell, 1948 (3)
- Genus Laomavix Iredale, 1933 (1)
- Genus Laomopa Iredale, 1945 (1)
- Genus Magilaoma Iredale, 1937 (2)
- Genus Miselaoma Iredale, 1933 (3)
- Genus Obanella Dell, 1952 (3)
- Genus Paralaoma Iredale, 1913 (38)
- Genus Paraloma Iredale, 1913 accepted as Paralaoma Iredale, 1913
- Genus Pasmaditta Kershaw & B. J. Smith, 1986 (1)
- Genus Pedicamista Kershaw & B. J. Smith, 1986 (1)
- Genus Pernastela Iredale, 1944 (3)
- Genus Phrixgnathus F. W. Hutton, 1882 (48)
- Subgenus Phrixgnathus (Taguahelix) A. W. B. Powell, 1955 accepted as Taguahelix A. W. B. Powell, 1955
- Species Phrixgnathus acanthinulopsis Suter, 1891
- Species Phrixgnathus alfredi (Suter, 1909)
- Species Phrixgnathus ariel F. W. Hutton, 1883
- Species Phrixgnathus blacki A. W. B. Powell, 1951
- Species Phrixgnathus brunneus Climo & Goulstone, 1993
- Species Phrixgnathus celia F. W. Hutton, 1883
- Species Phrixgnathus cheesemani Suter, 1894
- Species Phrixgnathus clathratus (N. W. Gardner, 1972)
- Species Phrixgnathus cognatus (Suter, 1909)
- Species Phrixgnathus compressus (Suter, 1909)
- Species Phrixgnathus conella (L. Pfeiffer, 1861) accepted as Laoma mariae (J. E. Gray, 1843)
- Species Phrixgnathus douglasi Climo & Goulstone, 1993
- Species Phrixgnathus erigone (J. E. Gray, 1850)
- Species Phrixgnathus fatuus (L. Pfeiffer, 1857) accepted as Therasiella celinde (J. E. Gray, 1850)
- Species Phrixgnathus filicostus (Suter, 1907)
- Species Phrixgnathus flemingi Dell, 1950
- Species Phrixgnathus forsteri Dell, 1952
- Species Phrixgnathus fulguratus (Suter, 1909)
- Species Phrixgnathus glabriusculus (L. Pfeiffer, 1853) accepted as Phrixgnathus glabriusculus (Reeve, 1852)
- Species Phrixgnathus glabriusculus (Reeve, 1852)
- Species Phrixgnathus glissoni (Ancey, 1889)
- Species Phrixgnathus gracilis (Suter, 1913)
- Species Phrixgnathus haasti F. W. Hutton, 1883
- Species Phrixgnathus hamiltoni (Suter, 1896)
- Species Phrixgnathus laqueus Dell, 1950
- Species Phrixgnathus larochei (A. W. B. Powell, 1928)
- Species Phrixgnathus levis (Suter, 1913)
- Species Phrixgnathus liratulus (Suter, 1909) accepted as Phrixgnathus celia F. W. Hutton, 1883
- Species Phrixgnathus lucidus (Suter, 1896)
- Species Phrixgnathus marginatus F. W. Hutton, 1882
- Species Phrixgnathus microreticulatus (Suter, 1890)
- Species Phrixgnathus moellendorffi (Suter, 1896)
- Species Phrixgnathus murdochi Suter, 1894
- Species Phrixgnathus oconnori A. W. B. Powell, 1941 accepted as Phrixgnathus phrynia F. W. Hutton, 1883
- Species Phrixgnathus paralaomiformis (Climo, 1971)
- Species Phrixgnathus phrynia F. W. Hutton, 1883
- Species Phrixgnathus pirongiaensis (Suter, 1894)
- Species Phrixgnathus poecilostictus (L. Pfeiffer, 1853)
- Species Phrixgnathus poecilostictus (Reeve, 1852)
- Species Phrixgnathus powelli (Climo, 1971)
- Species Phrixgnathus rakiura Dell, 1954
- Subspecies Phrixgnathus rakiura rakiura Dell, 1954
- Subspecies Phrixgnathus rakiura solanderi Dell, 1954
- Species Phrixgnathus ruforadiatus (N. W. Gardner, 1972)
- Species Phrixgnathus sciadium (L. Pfeiffer, 1857)
- Species Phrixgnathus serratocostata W. H. Webster, 1906 accepted as Paralaoma serratocostata (W. H. Webster, 1906)
- Species Phrixgnathus sorenseni (A. W. B. Powell, 1955)
- Species Phrixgnathus spiralis (Suter, 1896)
- Species Phrixgnathus subariel A. W. B. Powell, 1948
- Species Phrixgnathus sublucidus (Suter, 1896) accepted as Phrixgnathus lucidus (Suter, 1896)
- Species Phrixgnathus tatariiensis Solem, 1962
- Species Phrixgnathus tenuiscriptus (Ancey, 1896)
- Species Phrixgnathus titania F. W. Hutton, 1883
- Species Phrixgnathus trailli (Suter, 1909)
- Species Phrixgnathus transitans Suter, 1892
- Species Phrixgnathus viridulus (Suter, 1909)
- Species Phrixgnathus waipoua (N. W. Gardner, 1969)
- Genus Pichikadi Vargas-Almonacid & Stuardo, 2007 (1)
- Genus Pleuropunctum Germain, 1928 accepted as Paralaoma Iredale, 1913
- Genus Pseudiotula J. Stanisic, 2010 (1)
- Genus Semilaoma Iredale, 1944 (4)
- Genus Taguahelix A. W. B. Powell, 1955 (8)
- Genus Tescilaoma J. Stanisic, 2018 (2)
- Genus Toltecia Pilsbry, 1926 accepted as Paralaoma Iredale, 1913
- Genus Trocholaoma Iredale, 1937 (2)
- Genus Turbolaoma Iredale, 1937 (1)
- Genus Westralaoma Iredale, 1939 (4)
- Subfamily Punctinae E. S. Morse, 1864 (43)
- Genus Atactolaoma B. A. Marshall & Worthy, 2017 † (1)
- Genus Subfectola A. W. B. Powell, 1939 accepted as Paralaoma Iredale, 1913
- Family Trachycystidae Schileyko, 1986 accepted as Trachycystinae Schileyko, 1986
- Genus Afrodontops Kadolsky, 2020 † (2)
- Superfamily Testacelloidea J. E. Gray, 1840 (20)
- Superfamily Urocoptoidea Pilsbry, 1898 (1868) (1 251)
- Infraorder Helicoidei (5 691)
- Infraorder Limacoidei (4 248)
- Infraorder Oleacinoidei (497)
- Infraorder Orthalicoidei (1 587)
- 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 (1 036)
- 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