Between brackets is the number of accepted species
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- Mollusca (132 851)
- Subphylum Aculifera
- Subphylum Conchifera
- Subphylum Placophora accepted as Polyplacophora
- Superclass Aplacophora
- Class Amphineura accepted as Aculifera
- Class Bivalvia (25 013)
- Class Caudofoveata (143)
- Class Cephalopoda (1 834)
- Class Conchifera accepted as Bivalvia
- Class Cricoconarida † (1)
- Class Gastropoda (102 753)
- Subclass Amphigastropoda † (396)
- Subclass Angiogastropoda represented as Gastropoda
- Subclass Apogastropoda
- Subclass Caenogastropoda (53 670)
- Subclass Gastropoda incertae sedis (308)
- Subclass Heterobranchia (39 172)
- Infraclass "Lower Heterobranchia" (1 137)
- Infraclass Euthyneura (37 449)
- Subterclass Acteonimorpha (411)
- Subterclass Ringipleura (2 917)
- Subterclass Tectipleura (34 121)
- Superorder Acochlidiimorpha (48)
- Superorder Ascoglossa accepted as Sacoglossa
- Superorder Basommatophora accepted as Hygrophila
- Superorder Eupulmonata (25 585)
- Order Aillyida accepted as Achatinina
- Order Ellobiida (579)
- Order Gymnomorpha accepted as Systellommatophora
- Order Stylommatophora (24 782)
- Suborder Achatinina (2 912)
- Suborder Elasmognatha accepted as Succineoidei
- Suborder Helicina (21 630)
- 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)
- Tribe Alopiini A. J. Wagner, 1913 (103)
- Genus Albanodelima A. J. Wagner, 1924 accepted as Montenegrina O. Boettger, 1877
- Genus Alopia H. Adams & A. Adams, 1855 (22)
- Subgenus Alopia (Agathylla) H. Adams & A. Adams, 1855 accepted as Agathylla H. Adams & A. Adams, 1855
- Subgenus Alopia (Albinaria) Vest, 1867 accepted as Albinaria Vest, 1867
- Subgenus Alopia (Alopia) H. Adams & A. Adams, 1855 represented as Alopia H. Adams & A. Adams, 1855
- Species Alopia (Alopia) alpina R. Kimakowicz, 1933 represented as Alopia alpina R. Kimakowicz, 1933
- Species Alopia (Alopia) bielzii (L. Pfeiffer, 1849) represented as Alopia bielzii (L. Pfeiffer, 1849)
- Species Alopia (Alopia) bogatensis (E. A. Bielz, 1856) represented as Alopia bogatensis (E. A. Bielz, 1856)
- Species Alopia (Alopia) canescens (Charpentier, 1852) represented as Alopia canescens (Charpentier, 1852)
- Species Alopia (Alopia) glorifica (Charpentier, 1852) represented as Alopia glorifica (Charpentier, 1852)
- Species Alopia (Alopia) grossuana H. Nordsieck, 1977 represented as Alopia grossuana H. Nordsieck, 1977
- Species Alopia (Alopia) hirschfelderi H. Nordsieck, 2013 represented as Alopia hirschfelderi H. Nordsieck, 2013
- Species Alopia (Alopia) julii A. J. Wagner, 1914 accepted as Alopia livida julii A. J. Wagner, 1914
- Species Alopia (Alopia) lischkeana (Charpentier, 1852) represented as Alopia lischkeana (Charpentier, 1852)
- Species Alopia (Alopia) livida (Menke, 1828) represented as Alopia livida (Menke, 1828)
- Species Alopia (Alopia) mafteiana Grossu, 1967 represented as Alopia mafteiana Grossu, 1967
- Species Alopia (Alopia) mariae R. Kimakowicz, 1931 represented as Alopia mariae R. Kimakowicz, 1931
- Species Alopia (Alopia) meschendorferi (E. A. Bielz, 1858) represented as Alopia meschendorferi (E. A. Bielz, 1858)
- Species Alopia (Alopia) microstoma (M. Kimakowicz, 1883) accepted as Alopia (Alopia) regalis microstoma (M. Kimakowicz, 1883)
- Species Alopia (Alopia) monacha (M. Kimakowicz, 1894) represented as Alopia monacha (M. Kimakowicz, 1894)
- Species Alopia (Alopia) nefasta (M. Kimakowicz, 1894) represented as Alopia nefasta (M. Kimakowicz, 1894)
- Species Alopia (Alopia) nixa (M. Kimakowicz, 1894) represented as Alopia nixa (M. Kimakowicz, 1894)
- Species Alopia (Alopia) plumbea (Rossmässler, 1839) represented as Alopia plumbea (Rossmässler, 1839)
- Species Alopia (Alopia) regalis (M. Bielz, 1851) represented as Alopia regalis (M. Bielz, 1851)
- Subspecies Alopia (Alopia) regalis deubeli (Clessin, 1890) represented as Alopia regalis deubeli (Clessin, 1890)
- Subspecies Alopia (Alopia) regalis doftanae H. Nordsieck, 1977 represented as Alopia regalis doftanae H. Nordsieck, 1977
- Subspecies Alopia (Alopia) regalis glabriuscula (Rossmässler, 1858) represented as Alopia regalis glabriuscula (Rossmässler, 1858)
- Subspecies Alopia (Alopia) regalis microstoma (M. Kimakowicz, 1883) represented as Alopia regalis microstoma (M. Kimakowicz, 1883)
- Subspecies Alopia (Alopia) regalis mutabilis (M. Kimakowicz, 1894) represented as Alopia regalis mutabilis (M. Kimakowicz, 1894)
- Subspecies Alopia (Alopia) regalis nordsiecki Grossu & Tesio, 1973 represented as Alopia regalis nordsiecki Grossu & Tesio, 1973
- Subspecies Alopia (Alopia) regalis petrensis H. Nordsieck, 1996 represented as Alopia regalis petrensis H. Nordsieck, 1996
- Subspecies Alopia (Alopia) regalis proclivis (M. Kimakowicz, 1894) represented as Alopia regalis proclivis (M. Kimakowicz, 1894)
- Subspecies Alopia (Alopia) regalis regalis (M. Bielz, 1851) represented as Alopia regalis regalis (M. Bielz, 1851)
- Subspecies Alopia (Alopia) regalis sabinae R. Kimakowicz, 1928 represented as Alopia regalis sabinae R. Kimakowicz, 1928
- Subspecies Alopia (Alopia) regalis wagneri (M. Kimakowicz, 1894) represented as Alopia regalis wagneri (M. Kimakowicz, 1894)
- Species Alopia (Alopia) straminicollis (Charpentier, 1852) represented as Alopia straminicollis (Charpentier, 1852)
- Species Alopia (Alopia) subcosticollis (A. Schmidt, 1868) represented as Alopia subcosticollis (A. Schmidt, 1868)
- Species Alopia (Alopia) vicina (M. Kimakowicz, 1894) represented as Alopia vicina (M. Kimakowicz, 1894)
- Subgenus Alopia (Herilla) H. Adams & A. Adams, 1855 accepted as Herilla H. Adams & A. Adams, 1855
- Subgenus Alopia (Kimakowiczia) Szekeres, 1969 represented as Alopia H. Adams & A. Adams, 1855
- Subgenus Alopia (Medora) H. Adams & A. Adams, 1855 accepted as Medora H. Adams & A. Adams, 1855
- Subgenus Alopia (Nixa) Szekeres, 1976 accepted as Alopia H. Adams & A. Adams, 1855
- Species Alopia alpina R. Kimakowicz, 1933
- Species Alopia bielzii (L. Pfeiffer, 1849)
- Species Alopia bogatensis (E. A. Bielz, 1856)
- Species Alopia canescens (Charpentier, 1852)
- Species Alopia ciucasiana Grossu, 1969 accepted as Alopia nefasta ciucasiana Grossu, 1969
- Species Alopia cyclostoma (E. A. Bielz, 1858) accepted as Alopia pomatias (L. Pfeiffer, 1868)
- Species Alopia deaniana A. H. Cooke, 1922 accepted as Alopia livida deaniana A. H. Cooke, 1922
- Species Alopia fortunata R. Kimakowicz, 1931 accepted as Alopia vicina fortunata R. Kimakowicz, 1931
- Species Alopia fussi (M. Kimakowicz, 1894) accepted as Alopia nixa fussi (M. Kimakowicz, 1894)
- Species Alopia glauca (E. A. Bielz, 1853)
- Species Alopia glorifica (Charpentier, 1852)
- Species Alopia grossuana H. Nordsieck, 1977
- Species Alopia hildegardae R. Kimakowicz, 1931 accepted as Alopia mariae hildegardae R. Kimakowicz, 1931
- Species Alopia hirschfelderi H. Nordsieck, 2013
- Species Alopia lischkeana (Charpentier, 1852)
- Species Alopia livida (Menke, 1828)
- Species Alopia maciana Bădărău & Szekeres, 2001
- Species Alopia mafteiana Grossu, 1967
- Species Alopia magnifica R. Kimakowicz, 1962 accepted as Alopia glorifica magnifica R. Kimakowicz, 1962
- Species Alopia mariae R. Kimakowicz, 1931
- Species Alopia meschendorferi (E. A. Bielz, 1858)
- Species Alopia mixa R. Kimakowicz, 1933
- Species Alopia monacha (M. Kimakowicz, 1894)
- Species Alopia nefasta (M. Kimakowicz, 1894)
- Species Alopia nixa (M. Kimakowicz, 1894)
- Species Alopia nordsiecki Grossu & Tesio, 1973 accepted as Alopia (Alopia) regalis nordsiecki Grossu & Tesio, 1973
- Species Alopia occulta R. Kimakowicz, 1931 accepted as Alopia vicina occulta R. Kimakowicz, 1931
- Species Alopia petrensis H. Nordsieck, 1996 accepted as Alopia regalis petrensis H. Nordsieck, 1996
- Species Alopia plumbea (Rossmässler, 1839)
- Species Alopia pomatias (L. Pfeiffer, 1868)
- Species Alopia regalis (M. Bielz, 1851)
- Species Alopia romania R. Kimakowicz, 1933
- Species Alopia soosiana Agócsy & Pócs, 1961 accepted as Alopia pomatias (L. Pfeiffer, 1868)
- Species Alopia straminicollis (Charpentier, 1852) accepted as Alopia livida straminicollis (Charpentier, 1852)
- Species Alopia subcosticollis (A. Schmidt, 1868)
- Species Alopia valachiensis (O. Boettger, 1879) accepted as Alopia (Alopia) glorifica valachiensis (O. Boettger, 1879)
- Species Alopia vicina (M. Kimakowicz, 1894)
- Species Alopia vranceana Grossu, 1967 accepted as Alopia (Alopia) glorifica vranceana Grossu, 1967
- Genus Bosnica Westerlund, 1884 accepted as Herilla H. Adams & A. Adams, 1855
- Genus Eualopia Westerlund, 1884 accepted as Alopia H. Adams & A. Adams, 1855
- Genus Eutriloba Westerlund, 1884 accepted as Triloba Vest, 1867
- Genus Herilla H. Adams & A. Adams, 1855 (6)
- Genus Heteroptycha Westerlund, 1884 accepted as Montenegrina O. Boettger, 1877
- Genus Montenegrina O. Boettger, 1877 (68)
- Genus Protoherilla A. J. Wagner, 1921 (3)
- Genus Protriloba H. Nordsieck, 2014 † (2)
- Genus Taraclausilia H. Nordsieck, 1972 accepted as Protoherilla A. J. Wagner, 1921
- Genus Transsilvanica Westerlund, 1890 accepted as Alopia H. Adams & A. Adams, 1855
- Genus Triloba Vest, 1867 (2)
- Genus Trilobella B. B. Woodward, 1924 accepted as Triloba Vest, 1867
- Tribe Cochlodinini Lindholm, 1925 (1923) (42)
- Tribe Delimini R. Brandt, 1956 (62)
- Tribe Medorini H. Nordsieck, 1997 (227)
- 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)
- 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 (5 691)
- Infraorder Limacoidei (4 251)
- Infraorder Oleacinoidei (497)
- Infraorder Orthalicoidei (1 581)
- 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
