Between brackets is the number of accepted species

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- Mollusca (133 260)
- Subphylum Aculifera
- Subphylum Conchifera
- Subphylum Placophora accepted as Polyplacophora
- Superclass Aplacophora
- Class Amphineura accepted as Aculifera
- Class Bivalvia (25 078)
- Class Caudofoveata (143)
- Class Cephalopoda (1 917)
- Class Conchifera accepted as Bivalvia
- Class Cricoconarida † (1)
- Class Gastropoda (103 009)
- Subclass Amphigastropoda † (434)
- Subclass Angiogastropoda represented as Gastropoda
- Subclass Apogastropoda
- Subclass Caenogastropoda (53 818)
- Subclass Gastropoda incertae sedis (313)
- Subclass Heterobranchia (39 225)
- Infraclass "Lower Heterobranchia" (1 140)
- 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)
- 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)
- Genus Caspiophaedusa Lindholm, 1924 (1)
- Genus Cotyorica Grego & Szekeres, 2017 (1)
- Genus Dobatia H. Nordsieck, 1973 (1)
- Genus Laeviphaedusa I. M. Likharev & Steklov, 1965 (2)
- Genus Microphaedusa H. Nordsieck, 1978 (1)
- Genus Mira O. Boettger, 1877 accepted as Dobatia H. Nordsieck, 1973
- Genus Miralinda Lindholm, 1924 accepted as Dobatia H. Nordsieck, 1973
- Genus Nothoserrulina Németh & Szekeres, 1995 (1)
- Genus Pamphylica Németh & Szekeres, 1995 (1)
- Genus Phygas A. J. Wagner, 1914 accepted as Sciocochlea C. R. Boettger, 1935
- Genus Pontophaedusella H. Nordsieck, 1994 (1)
- Genus Pravispira Lindholm, 1924 (5)
- Genus Protophaedusa Szekeres, 1970 accepted as Laeviphaedusa I. M. Likharev & Steklov, 1965
- Genus Pseudoserrulina Forcart, 1935 accepted as Serrulina Mousson, 1873
- Genus Sciocochlea C. R. Boettger, 1935 (4)
- Genus Serrulina Mousson, 1873 (2)
- Subgenus Serrulina (Dobatia) H. Nordsieck, 1973 accepted as Dobatia H. Nordsieck, 1973
- Subgenus Serrulina (Pamphylica) Németh & Szekeres, 1995 accepted as Pamphylica Németh & Szekeres, 1995
- Subgenus Serrulina (Pravispira) Lindholm, 1924 accepted as Pravispira Lindholm, 1924
- Subgenus Serrulina (Serrulina) Mousson, 1873 represented as Serrulina Mousson, 1873
- Subgenus Serrulina (Serrulinella) H. Nordsieck, 1984 accepted as Serrulinella H. Nordsieck, 1984
- Subgenus Serrulina (Truncatophaedusa) Majoros, Németh & Szili-Kovács, 1994 accepted as Truncatophaedusa Majoros, Németh & Szili-Kovács, 1994
- Species Serrulina amphiodon (Reuss, 1861) † accepted as Serrulastra (Serrulastra) amphiodon (Reuss, 1861) †
- Species Serrulina bessarabica (Simionescu & Barbu, 1940) † accepted as Cochlodina bessarabica (Simionescu & Barbu, 1940) †
- Species Serrulina brandti Schütt, 1967 † accepted as Serrulastra brandti (Schütt, 1967) †
- Species Serrulina clessini (O. Boettger, 1877) † accepted as Serrulella clessini (O. Boettger, 1877) †
- Species Serrulina collasi Sturany, 1904 accepted as Sciocochlea collasi (Sturany, 1904)
- Species Serrulina cuvieri (Delafond & Depéret, 1893) † accepted as Emarginaria cuvieri (Delafond & Depéret, 1893) †
- Species Serrulina decemplicata (Sacco, 1886) † accepted as Serrulella decemplicata (Sacco, 1886) †
- Species Serrulina michelottii (Michaud, 1862) † accepted as Serrulella michelottii (Michaud, 1862) †
- Species Serrulina polyodon (Reuss, 1861) † accepted as Serrulastra (Serrustigma) polyodon (Reuss, 1861) †
- Species Serrulina ptycholarynx (O. Boettger, 1877) † accepted as Serrulastra (Serruplica) ptycholarynx (O. Boettger, 1877) †
- Species Serrulina schwageri (O. Boettger, 1877) † accepted as Serrulella schwageri (O. Boettger, 1877) †
- Species Serrulina senghanensis Germain, 1933 accepted as Serrulinella senghanensis (Germain, 1933)
- Species Serrulina serrulata (L. Pfeiffer, 1847)
- Species Serrulina sieversi (L. Pfeiffer, 1871)
- Species Serrulina signifera Westerlund, 1897 accepted as Caspiophaedusa perlucens (O. Boettger, 1877)
- Species Serrulina truci H. Nordsieck, 1972 † accepted as Serrulella truci (H. Nordsieck, 1972) †
- Genus Truncatophaedusa Majoros, Németh & Szili-Kovács, 1994 (1)
- Genus Tsoukatosia E. Gittenberger, 2000 (10)
- 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