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- Mollusca (133 259)
- Subphylum Aculifera
- Subphylum Conchifera
- Subphylum Placophora accepted as Polyplacophora
- Superclass Aplacophora
- Class Amphineura accepted as Aculifera
- Class Bivalvia (25 079)
- Class Caudofoveata (143)
- Class Cephalopoda (1 917)
- Class Conchifera accepted as Bivalvia
- Class Cricoconarida † (1)
- Class Gastropoda (103 007)
- Subclass Amphigastropoda † (434)
- Subclass Angiogastropoda represented as Gastropoda
- Subclass Apogastropoda
- Subclass Caenogastropoda (53 817)
- Subclass Gastropoda incertae sedis (313)
- Subclass Heterobranchia (39 224)
- Infraclass "Lower Heterobranchia" (1 139)
- Infraclass Euthyneura (37 498)
- Subterclass Acteonimorpha (413)
- Subterclass Ringipleura (2 917)
- Subterclass Tectipleura (34 168)
- Superorder Acochlidiimorpha (48)
- Superorder Ascoglossa accepted as Sacoglossa
- Superorder Basommatophora accepted as Hygrophila
- Superorder Eupulmonata (25 623)
- Order Aillyida accepted as Achatinina
- Order Ellobiida (579)
- Order Gymnomorpha accepted as Systellommatophora
- Order Stylommatophora (24 820)
- Suborder Achatinina (2 912)
- Suborder Elasmognatha accepted as Succineoidei
- Suborder Helicina (21 668)
- Infraorder Arionoidei (140)
- Infraorder Clausilioidei (1 859)
- Superfamily Clausilioidea J. E. Gray, 1855 (1 859)
- Family Clausiliidae J. E. Gray, 1855 (1 762)
- Subfamily Alopiinae A. J. Wagner, 1913 (434)
- Subfamily Clausiliinae J. E. Gray, 1855 (288)
- Subfamily Cochlodininae Lindholm, 1925 accepted as Cochlodinini Lindholm, 1925 (1923)
- Subfamily Constrictinae H. Nordsieck, 1981 † (7)
- Subfamily Eualopiinae H. Nordsieck, 1978 † (30)
- Subfamily Euxininae I. M. Likharev, 1962 accepted as Clausiliinae J. E. Gray, 1855
- Subfamily Garnieriinae C. R. Boettger, 1926 (61)
- Subfamily Laminiferinae Wenz, 1923 (24)
- Subfamily Mentissoideinae Lindholm, 1924 accepted as Mentissoideini Lindholm, 1924
- Subfamily Neniinae Wenz, 1923 (14)
- Subfamily Peruiniinae H. Nordsieck, 2005 (144)
- Subfamily Phaedusinae A. J. Wagner, 1922 (758)
- Tribe Caspiophaedusini H. Nordsieck, 2007 accepted as Serrulinini Ehrmann, 1927 (2)
- Tribe Disjunctariini H. Nordsieck, 2014 † (13)
- Tribe Nordsieckiini H. Nordsieck, 2007 † (8)
- Tribe Phaedusini A. J. Wagner, 1922 (637)
- Genus Acanthophaedusa H. Nordsieck, 2007 (3)
- Genus Acrophaedusa O. Boettger, 1877 accepted as Oospira W. T. Blanford, 1872
- Genus Aprosphyma A. J. Wagner, 1920 accepted as Megalophaedusa O. Boettger, 1877
- Genus Atractophaedusa Ehrmann, 1927 (7)
- Genus Bacillophaedusa Grego & Szekeres, 2011 (1)
- Genus Bacillopheadusa Grego & Szekeres, 2011 accepted as Bacillophaedusa Grego & Szekeres, 2011
- Genus Bathyptychia Lindholm, 1925 (16)
- Genus Breviphaedusa Azuma, 1982 accepted as Stereophaedusa (Breviphaedusa) Azuma, 1982
- Genus Calcariclavis Lindholm, 1924 accepted as Phaedusa H. Adams & A. Adams, 1855
- Genus Castanophaedusa Páll-Gergely & Szekeres, 2017 (2)
- Genus Celsiphaedusa H. Nordsieck, 2001 (1)
- Genus Changphaedusa Motochin & Ueshima, 2017 (1)
- Genus Cirrophaedusa Grego & Szekeres, 2011 accepted as Oospira (Paraformosana) H. Nordsieck, 2003 (1)
- Genus Cylindrophaedusa O. Boettger, 1877 (12)
- Genus Dautzenbergiella Lindholm, 1924 (6)
- Genus Decolliphaedusa Azuma, 1982 accepted as Megalophaedusa (Tyrannophaedusa) Pilsbry, 1900
- Genus Diceratoptyx Pilsbry, 1905 accepted as Zaptyx Pilsbry, 1900
- Genus Euphaedusa O. Boettger, 1877 (34)
- Genus Falsiluna Grego & Szekeres, 2011 accepted as Miraphaedusa (Falsiluna) Grego & Szekeres, 2011
- Genus Formosana O. Boettger, 1877 (38)
- Subgenus Formosana (Dextroformosana) O. Boettger & Schmacker, 1894 accepted as Formosana O. Boettger, 1877
- Subgenus Formosana (Formosana) O. Boettger, 1877 represented as Formosana O. Boettger, 1877
- Species Formosana abscedens Hunyadi & Szekeres, 2016
- Species Formosana albiapex K.-M. Chang & Ookubo, 1994
- Species Formosana albida K.-M. Chang, 1991 accepted as Formosana formosensis formosensis (H. Adams, 1866)
- Species Formosana antilopina (Heude, 1885)
- Species Formosana artifina (Heude, 1885)
- Species Formosana coudeini (Bavay & Dautzenberg, 1899)
- Species Formosana dextrogyra (Bavay & Dautzenberg, 1909)
- Species Formosana elegans (H. Nordsieck, 2012)
- Species Formosana formosensis (H. Adams, 1866)
- Species Formosana friniana (Heude, 1890) accepted as Formosanella friniana (Heude, 1890)
- Species Formosana gigas (Möllendorff, 1885)
- Species Formosana goniostoma (H. Nordsieck, 2016)
- Species Formosana hsuehshanensis C.-C. Hwang, M.-J. Ger & S.-P. Wu, 2022
- Species Formosana jianyueae Z.-Y. Chen, 2020
- Species Formosana kaluluanensis C.-C. Hwang, M.-J. Ger & S.-P. Wu, 2022
- Species Formosana katipulensis C.-C. Hwang, M.-J. Ger & S.-P. Wu, 2022
- Species Formosana kiangshiensis (Gredler, 1892)
- Species Formosana kongshanensis (H. Nordsieck, 2007)
- Species Formosana kremeri Grego & Szekeres, 2017
- Species Formosana lepidospira (Heude, 1889) accepted as Oospira (Paraformosana) lepidospira (Heude, 1889)
- Species Formosana libonensis (D.-H. Li, T.-C. Luo & D.-N. Chen, 2003)
- Species Formosana lilongshanensis C.-C. Hwang, M.-J. Ger & S.-P. Wu, 2022
- Species Formosana lingchuanensis K.-M. Chang, 1989
- Species Formosana longispira (Heude, 1885) accepted as Oospira longispina (Heude, 1885)
- Species Formosana lunanensis D.-N. Chen & G.-Q. Zhang, 1999 accepted as Euphaedusa lunanensis (D.-N. Chen & G.-Q. Zhang, 1999)
- Species Formosana magnaciana (Heude, 1882)
- Species Formosana malleolata (H. Nordsieck, 2012)
- Species Formosana moschina (Gredler, 1888)
- Species Formosana moschinella (H. Nordsieck, 2007)
- Species Formosana nanaoensis C.-C. Hwang, M.-J. Ger & S.-P. Wu, 2022
- Species Formosana ooharai (H. Nordsieck, 2007)
- Species Formosana pacifica (Gredler, 1884)
- Subspecies Formosana pacifica decapitata (H. Nordsieck, 2016)
- Subspecies Formosana pacifica pacifica (Gredler, 1884)
- Subspecies Formosana pacifica siantanensis (Gredler, 1885)
- Species Formosana phyllostoma (Heude, 1888) accepted as Oospira (Paraformosana) phyllostoma (Heude, 1888)
- Species Formosana psilodonta (Heude, 1889)
- Species Formosana renzhigangi Grego & Szekeres, 2019
- Species Formosana ruianensis Z.-J. Xu & M.-W. Cai, 2024
- Species Formosana schawalleri (H. Nordsieck, 2001)
- Species Formosana seguiniana (Heude, 1885) accepted as Formosanella seguiniana (Heude, 1885)
- Species Formosana semprinii (Gredler, 1884)
- Species Formosana splendens (H. Nordsieck, 2005)
- Species Formosana swinhoei (L. Pfeiffer, 1866)
- Species Formosana taiwanica (Pilsbry, 1909)
- Species Formosana telum (H. Nordsieck, 2003)
- Species Formosana tianchihensis C.-C. Hwang, M.-J. Ger & S.-P. Wu, 2022
- Species Formosana timalthea (Sykes, 1898) accepted as Formosana friniana (Heude, 1890)
- Species Formosana umbrosa (H. Nordsieck, 2007)
- Species Formosana xinxingae (L. Qiu, 2022)
- Genus Formosanella H. Nordsieck, 2003 (4)
- Genus Fuchsiana Gredler, 1887 (3)
- Genus Hemiphaedusa O. Boettger, 1877 (18)
- Genus Hemizaptyx Pilsbry, 1905 accepted as Zaptyx (Hemizaptyx) Pilsbry, 1905
- Genus Heterozaptyx Pilsbry, 1906 accepted as Zaptyx Pilsbry, 1900
- Genus Heudiella Annandale, 1924 accepted as Macrophaedusa Möllendorff, 1883
- Genus Idiozaptyx Pilsbry, 1909 accepted as Zaptyx (Zaptyx) Pilsbry, 1900
- Genus Juttingia Loosjes, 1965 (4)
- Genus Leptacme Ehrmann, 1927 accepted as Oospira (Leptocochlea) Grego & Szekeres, 2011
- Genus Leptocochlea Grego & Szekeres, 2011 accepted as Oospira (Leptocochlea) Grego & Szekeres, 2011
- Genus Lindholmiella Ehrmann, 1927 accepted as Oospira (Lindholmiella) Ehrmann, 1927 (1)
- Genus Liparophaedusa Lindholm, 1924 (6)
- Genus Loosjesia H. Nordsieck, 2002 (1)
- Genus Luchuphaedusa Pilsbry, 1901 accepted as Stereophaedusa (Luchuphaedusa) Pilsbry, 1901
- Genus Macrenoica A. J. Wagner, 1920 accepted as Oospira W. T. Blanford, 1872
- Genus Macrophaedusa Möllendorff, 1883 (3)
- Genus Macrophaedusella H. Nordsieck, 2001 (1)
- Genus Mansuyia H. Nordsieck, 2002 accepted as Dautzenbergiella (Mansuyiella) H. Nordsieck, 2003
- Genus Margaritiphaedusa H. Nordsieck, 2001 (10)
- Genus Megalophaedusa O. Boettger, 1877 (63)
- Genus Mesophaedusa Ehrmann, 1929 accepted as Stereophaedusa (Mesophaedusa) Ehrmann, 1929
- Genus Messageriella Páll-Gergely & Szekeres, 2017 (2)
- Genus Metazaptyx Pilsbry, 1905 accepted as Zaptyx (Zaptyx) Pilsbry, 1900
- Genus Minatoia Hunyadi & Szekeres, 2016 (1)
- Genus Miraphaedusa H. Nordsieck, 2005 (4)
- Genus Mundiphaedusa Minato, 1979 accepted as Megalophaedusa (Megalophaedusa) O. Boettger, 1877
- Genus Musaphaedusa H. Nordsieck, 2018 (1)
- Genus Nannophaedusa H. Nordsieck, 2012 (1)
- Genus Nemiphaedeesa O. Boettger, 1877 accepted as Hemiphaedusa O. Boettger, 1877
- Genus Neophaedusa Kuroda & Minato, 1975 accepted as Megalophaedusa (Neophaedusa) Kuroda & Minato, 1975
- Genus Nesiophaedusa Pilsbry, 1905 accepted as Stereophaedusa (Luchuphaedusa) Pilsbry, 1901
- Genus Notoptychia Ehrmann, 1927 (3)
- Genus Oligozaptyx Pilsbry, 1905 accepted as Zaptyx (Stereozaptyx) Pilsbry, 1905
- Genus Oophaedusa Pilsbry, 1905 accepted as Stereophaedusa (Oophaedusa) Pilsbry, 1905
- Genus Oospira W. T. Blanford, 1872 (98)
- Genus Paganizaptyx Azuma, 1982 accepted as Zaptyx Pilsbry, 1900
- Genus Papilliphaedusa H. Nordsieck, 2003 (8)
- Genus Paraphaedusa O. Boettger, 1899 (7)
- Genus Parazaptyx Pilsbry, 1905 accepted as Zaptyx (Parazaptyx) Pilsbry, 1905
- Genus Pauciphaedusa Minato & T. Habe, 1983 accepted as Megalophaedusa (Pauciphaedusa) Minato & T. Habe, 1983
- Genus Phaedusa H. Adams & A. Adams, 1855 (55)
- Genus Pictophaedusa Azuma, 1982 accepted as Reinia (Pictophaedusa) Azuma, 1982
- Genus Pinguiphaedusa Azuma, 1982 accepted as Megalophaedusa (Pinguiphaedusa) Azuma, 1982
- Genus Pliciphaedusa H. Nordsieck, 1998 accepted as Stereophaedusa (Pliciphaedusa) H. Nordsieck, 1998 (1)
- Genus Polyptychephora A. J. Wagner, 1920 accepted as Phaedusa H. Adams & A. Adams, 1855
- Genus Probosciphaedusa Z.-Y. Chen, 2021 (1)
- Genus Proreinia Thiele, 1931 accepted as Reinia Kobelt, 1876
- Genus Pseudonenia O. Boettger, 1877 accepted as Oospira W. T. Blanford, 1872
- Genus Pulchraptyx Minato, 1981 accepted as Zaptyx (Pulchraptyx) Minato, 1981
- Genus Reinia Kobelt, 1876 (16)
- Genus Renschiphaedusa Loosjes & Loosjes-van Bemmel, 1973 accepted as Phaedusa H. Adams & A. Adams, 1855
- Genus Rufospira Möllendorff, 1883 accepted as Oospira W. T. Blanford, 1872
- Genus Selenophaedusa Lindholm, 1924 (20)
- Genus Selenoptyx Pilsbry, 1908 accepted as Zaptyx (Selenoptyx) Pilsbry, 1908
- Genus Serriphaedusa H. Nordsieck, 2001 (18)
- Genus Sinigena Lindholm, 1925 (2)
- Genus Siphonophaedusa Lindholm, 1924 accepted as Oospira (Siphonophaedusa) Lindholm, 1924 (1)
- Genus Solitariphaedusa Motochin & Ueshima, 2017 (1)
- Genus Spinulaphaedusa Minato, 1994 accepted as Megalophaedusa (Tyrannophaedusa) Pilsbry, 1900
- Genus Stercophaedusa O. Boettger, 1877 accepted as Stereophaedusa O. Boettger, 1877
- Genus Stereophaedusa O. Boettger, 1877 (50)
- Genus Stereozaptyx Pilsbry, 1905 accepted as Zaptyx (Stereozaptyx) Pilsbry, 1905
- Genus Streptodera Lindholm, 1925 (1)
- Genus Taiwanphaedusa Motochin & Ueshima, 2017 (2)
- Genus Tauphaedusa H. Nordsieck, 2003 (15)
- Genus Thaumatoptyx Pilsbry, 1908 accepted as Zaptyx (Thaumatoptyx) Pilsbry, 1908
- Genus Tosaphaedusa Ehrmann, 1929 (2)
- Genus Tyrannophaedusa Pilsbry, 1900 accepted as Megalophaedusa (Tyrannophaedusa) Pilsbry, 1900
- Genus Tyrannozaptyx Käufel, 1930 accepted as Zaptyx (Tyrannozaptyx) Käufel, 1930
- Genus Vastina Ehrmann, 1929 accepted as Stereophaedusa (Mesophaedusa) Ehrmann, 1929
- Genus Ventriphaedusa Azuma, 1982 accepted as Megalophaedusa (Ventriphaedusa) Azuma, 1982
- Genus Vitriphaedusa Azuma, 1982 accepted as Megalophaedusa (Vitriphaedusa) Azuma, 1982
- Genus Zaptychopsis Ehrmann, 1927 accepted as Zaptyx (Zaptychopsis) Ehrmann, 1927
- Genus Zaptyx Pilsbry, 1900 (91)
- Tribe Pontophaedusini H. Nordsieck, 2022 (3)
- Tribe Pravispirini H. Nordsieck, 2007 accepted as Serrulinini Ehrmann, 1927
- Tribe Serrulellini H. Nordsieck, 2007 † (20)
- Tribe Serrulinini Ehrmann, 1927 (31)
- Tribe Synprosphymini H. Nordsieck, 2007 accepted as Synprosphyminae H. Nordsieck, 2007
- Genus Excussispira Lindholm, 1925 (8)
- Genus Graecophaedusa Rähle, 1982 (1)
- Genus Serrulinella H. Nordsieck, 1984 (1)
- Genus Synprosphyma A. J. Wagner, 1920 (34)
- Subfamily Serrulininae Ehrmann, 1927 accepted as Serrulinini Ehrmann, 1927
- Subfamily Synprosphyminae H. Nordsieck, 2007 accepted as Phaedusinae A. J. Wagner, 1922
- Genus Cirrobasis Conrad, 1874 † (1)
- Genus Dactylius F. Sandberger, 1872 † accepted as Filholia Bourguignat, 1877 †
- Genus Dactylomorpha Gude, 1911 † accepted as Filholia Bourguignat, 1877 †
- Genus Dextroformosana O. Boettger & Schmacker, 1894 accepted as Formosana O. Boettger, 1877
- Genus Dextrospira Hrubesch, 1965 † (1)
- Genus Distortiphaedusa Grego & Szekeres, 2011 accepted as Oospira (Distortiphaedusa) Grego & Szekeres, 2011
- Genus Pirostoma Möllendorff, 1873 accepted as Macrogastra W. Hartmann, 1841
- Family Filholiidae Wenz, 1923 † (82)
- Family Palaeostoidae H. Nordsieck, 1986 † (15)
- Infraorder Helicina incertae sedis (3 210)
- Infraorder Helicoidei (5 698)
- Infraorder Limacoidei (4 247)
- Infraorder Oleacinoidei (497)
- Infraorder Orthalicoidei (1 587)
- Infraorder Partuloinei accepted as Pupilloidei
- Infraorder Pupilloidei (3 466)
- Infraorder Rhytidoidei (580)
- 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 (2 009)
- 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 (1 039)
- 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 (109)
- Infraclass Opisthobranchia
- Infraclass Pulmonata
- Subclass Neomphaliones accepted as Vetigastropoda
- Subclass Neritimorpha (1 916)
- Subclass Orthogastropoda represented as Gastropoda
- Subclass Patellogastropoda (514)
- Subclass Prosobranchia
- Subclass Psilogastropoda represented as Gastropoda
- Subclass Vetigastropoda (6 789)
- 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 (1 381)
- Class Polyplaxiphora accepted as Polyplacophora
- Class Rostroconchia † (64)
- Class Scaphopoda (753)
- Class Solenoconchia accepted as Scaphopoda
- Class Solenogastres (313)
- Subclass Chaetodermomorpha accepted as Caudofoveata
