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)
- 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)
- 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)
- Subgenus Montenegrina (Beieriella) W. Klemm, 1962 accepted as Montenegrina O. Boettger, 1877
- Subgenus Montenegrina (Heteroptycha) Westerlund, 1884 accepted as Montenegrina O. Boettger, 1877
- Subgenus Montenegrina (Montenegrina) O. Boettger, 1877 accepted as Montenegrina O. Boettger, 1877
- Species Montenegrina apfelbecki (Sturany, 1907)
- Species Montenegrina atanasiensis De Mattia, Fehér, Mason & Haring, 2020
- Species Montenegrina attemsi (A. J. Wagner, 1914)
- Species Montenegrina caesia Fehér & Szekeres, 2006 accepted as Montenegrina okolensis caesia Fehér & Szekeres, 2006
- Species Montenegrina cattaroensis (Rossmässler, 1835)
- Species Montenegrina chiasma H. Nordsieck, 1972
- Species Montenegrina csikii Erőss & Szekeres, 2006
- Species Montenegrina dedovi H. Nordsieck, 2009 accepted as Montenegrina miraka dedovi H. Nordsieck, 2009
- Species Montenegrina dennisi E. Gittenberger, 2002
- Species Montenegrina desaretica Fehér & Szekeres, 2016
- Species Montenegrina dofleini (A. J. Wagner, 1928)
- Species Montenegrina drimica H. Nordsieck, 1972
- Species Montenegrina drimmeri Fehér & Szekeres, 2006
- Species Montenegrina edmundi Szekeres, 2006
- Species Montenegrina ersekensis H. Nordsieck, 1996
- Species Montenegrina flava Erőss & Szekeres, 2006
- Species Montenegrina fuchsi R. A. Brandt, 1961
- Species Montenegrina fusca Fehér & Szekeres, 2006
- Species Montenegrina globocica De Mattia, Fehér, Mason & Haring, 2020
- Species Montenegrina golikutensis Fehér & Szekeres, 2016
- Species Montenegrina gracilis Erőss & Szekeres, 2006
- Species Montenegrina grammica H. Nordsieck, 1988
- Species Montenegrina gregoi Fehér & Szekeres, 2016
- Species Montenegrina gropana Fehér & Szekeres, 2016
- Species Montenegrina haringae Fehér & Szekeres, 2016
- Species Montenegrina helvola (Küster, 1853)
- Species Montenegrina hiltrudae H. Nordsieck, 1972
- Species Montenegrina iba H. Nordsieck, 1972
- Species Montenegrina improvisa Fehér & Szekeres, 2016
- Species Montenegrina irmengardis W. Klemm, 1962 accepted as Montenegrina rugilabris irmengardis W. Klemm, 1962
- Species Montenegrina jakupicensis Fauer, 1993
- Species Montenegrina janinensis (Mousson, 1859)
- Species Montenegrina kastoriae H. Nordsieck, 1972
- Species Montenegrina klemmi R. A. Brandt, 1962
- Species Montenegrina lambdaformis P. L. Reischütz & Sattmann, 1990
- Species Montenegrina laxa (Küster, 1860)
- Species Montenegrina lillae Fehér & Szekeres, 2016
- Species Montenegrina minuscula Erőss & Szekeres, 2006
- Species Montenegrina miraka H. Nordsieck, 1996
- Species Montenegrina nana Fehér & Szekeres, 2006
- Species Montenegrina nobilis Erőss & Szekeres, 2006
- Species Montenegrina ochridensis (A. J. Wagner, 1925)
- Species Montenegrina okolensis Szekeres, 2006
- Species Montenegrina pallida Fauer, 1993
- Species Montenegrina perstriata (A. J. Wagner, 1919)
- Species Montenegrina pifkoi Fehér & Szekeres, 2016
- Species Montenegrina pindica H. Nordsieck, 1988
- Species Montenegrina pinteri H. Nordsieck, 1974
- Species Montenegrina prespaensis H. Nordsieck, 1988
- Species Montenegrina prokletiana Fehér & Szekeres, 2016
- Species Montenegrina protruda E. Gittenberger, 2002
- Species Montenegrina puskasi Fehér & Szekeres, 2016
- Species Montenegrina radikae H. Nordsieck, 1972
- Species Montenegrina remota Fehér & Szekeres, 2006
- Species Montenegrina rugilabris (Mousson, 1859)
- Species Montenegrina sattmanni H. Nordsieck, 1988
- Species Montenegrina selcensis Fehér & Szekeres, 2016
- Species Montenegrina skipetarica (Soós, 1924)
- Species Montenegrina soosi Erőss & Szekeres, 2006
- Species Montenegrina sporadica H. Nordsieck, 1974
- Species Montenegrina stankovici (Urbański, 1960)
- Species Montenegrina sturanyana Fehér & Szekeres, 2016
- Species Montenegrina subcristata (Küster, 1847)
- Species Montenegrina tenebrosa H. Nordsieck, 2009
- Subspecies Montenegrina tenebrosa szekeresi De Mattia, Fehér, Mason & Haring, 2020
- Subspecies Montenegrina tenebrosa tenebrosa H. Nordsieck, 2009
- Species Montenegrina thysi Loosjes & Loosjes-van Bemmel, 1988 accepted as Montenegrina voidomatis thysi Loosjes & Loosjes-van Bemmel, 1988
- Species Montenegrina timeae Erőss & Szekeres, 2006
- Species Montenegrina tomorosi R. A. Brandt, 1961
- Species Montenegrina tropojana Fehér & Szekeres, 2016
- Species Montenegrina umbilicata (O. Boettger, 1879)
- Species Montenegrina voidomatis H. Nordsieck, 1974
- Species Montenegrina wagneri Szekeres, 2006
- Species Montenegrina zilchi H. Nordsieck, 1974
- 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 (1 587)
- 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
