Between brackets is the number of accepted species

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- Mollusca (132 791)
- Subphylum Aculifera
- Subphylum Conchifera
- Subphylum Placophora accepted as Polyplacophora
- Superclass Aplacophora
- Class Amphineura accepted as Aculifera
- Class Bivalvia (25 009)
- Class Caudofoveata (143)
- Class Cephalopoda (1 834)
- Class Conchifera accepted as Bivalvia
- Class Cricoconarida † (1)
- Class Gastropoda (102 697)
- Subclass Amphigastropoda † (390)
- Subclass Angiogastropoda represented as Gastropoda
- Subclass Apogastropoda
- Subclass Caenogastropoda (53 636)
- Subclass Gastropoda incertae sedis (308)
- Subclass Heterobranchia (39 156)
- Infraclass "Lower Heterobranchia" (1 137)
- Infraclass Euthyneura (37 433)
- Subterclass Acteonimorpha (411)
- Subterclass Ringipleura (2 917)
- Subterclass Tectipleura (34 105)
- Superorder Acochlidiimorpha (48)
- Superorder Ascoglossa accepted as Sacoglossa
- Superorder Basommatophora accepted as Hygrophila
- Superorder Eupulmonata (25 569)
- Order Aillyida accepted as Achatinina
- Order Ellobiida (579)
- Order Gymnomorpha accepted as Systellommatophora
- Order Stylommatophora (24 766)
- Suborder Achatinina (2 900)
- Suborder Elasmognatha accepted as Succineoidei
- Suborder Helicina (21 626)
- Infraorder Arionoidei (140)
- Infraorder Clausilioidei (1 859)
- Infraorder Helicina incertae sedis (3 210)
- Infraorder Helicoidei (5 690)
- Infraorder Limacoidei (4 251)
- Superfamily Dyakioidea Gude & B. B. Woodward, 1921 accepted as Trochomorphoidea Mörch, 1864
- Superfamily Gastrodontoidea Tryon, 1866 (621)
- Superfamily Helicarionoidea Bourguignat, 1877 (1 862)
- Superfamily Limacoidea Batsch, 1789 (365)
- Superfamily Limacoidei incertae sedis (3)
- Superfamily Parmacelloidea P. Fischer, 1856 (1855)
- Superfamily Trochomorphoidea Mörch, 1864 (1 190)
- Superfamily Zonitoidea Mörch, 1864 (118)
- Family Milacidae Ellis, 1926 (55)
- Family Parmacellidae P. Fischer, 1856 (1855) (26)
- Genus Candaharia Godwin-Austen, 1888 (5)
- Genus Clathropodium Westerlund, 1897 accepted as Parmacella Cuvier, 1805
- Genus Cryptella P. B. Webb & S. Berthelot, 1833 (7)
- Genus Drusia J. E. Gray, 1855 (6)
- Genus Euparmacella Simroth, 1913 accepted as Parmacella Cuvier, 1805
- Genus Parmacella Cuvier, 1805 (8)
- Subgenus Parmacella (Cryptella) P. B. Webb & S. Berthelot, 1833 accepted as Cryptella P. B. Webb & S. Berthelot, 1833
- Subgenus Parmacella (Kandaharia) Godwin-Austen, 1888 accepted as Candaharia Godwin-Austen, 1888
- Subgenus Parmacella (Parmacella) Cuvier, 1805 accepted as Parmacella Cuvier, 1805
- Subgenus Parmacella (Proparmacella) Simroth, 1913 accepted as Candaharia Godwin-Austen, 1888
- Species Parmacella aethiops Westerlund, 1896 accepted as Candaharia aethiops (Westerlund, 1896)
- Species Parmacella alexandrina Ehrenberg, 1831 accepted as Parmacella olivieri Cuvier, 1805
- Species Parmacella algerica Deshayes, 1852 accepted as Drusia deshayesii (Moquin-Tandon, 1848)
- Species Parmacella auriculata Mousson, 1872 accepted as Cryptella auriculata (Mousson, 1872)
- Species Parmacella callosa Mousson, 1872 accepted as Cryptella auriculata (Mousson, 1872)
- Species Parmacella calyculata G. B. Sowerby I, 1823
- Species Parmacella cumingi L. Pfeiffer, 1847
- Species Parmacella deshayesii Moquin-Tandon, 1848 accepted as Drusia deshayesii (Moquin-Tandon, 1848)
- Species Parmacella dorsalis Mousson, 1874 accepted as Drusia deshayesii (Moquin-Tandon, 1848)
- Species Parmacella festae Gambetta, 1925 accepted as Parmacella olivieri Cuvier, 1805
- Species Parmacella gervaisii Moquin-Tandon, 1850 accepted as Drusia gervaisii (Moquin-Tandon, 1850)
- Species Parmacella ibera Eichwald, 1841 accepted as Drusia ibera (Eichwald, 1841)
- Species Parmacella kainarensis Simroth, 1913 accepted as Candaharia rutellum (T. Hutton, 1849)
- Species Parmacella kaznakovi Simroth, 1913 accepted as Candaharia levanderi (Simroth, 1902)
- Species Parmacella kojhakensis Godwin-Austen, 1914 accepted as Candaharia rutellum (T. Hutton, 1849)
- Species Parmacella korschinskii Simroth, 1902
- Species Parmacella levanderi Simroth, 1902 accepted as Candaharia levanderi (Simroth, 1902)
- Species Parmacella mesopotamiae Oken, 1815 accepted as Parmacella olivieri Cuvier, 1805
- Species Parmacella mesopotamica Oken, 1816 accepted as Parmacella olivieri Cuvier, 1805
- Species Parmacella moquini Bourguignat, 1859 accepted as Parmacella gervaisii Moquin-Tandon, 1850
- Species Parmacella nigricans R. A. Philippi, 1836 accepted as Milax nigricans (R. A. Philippi, 1836)
- Species Parmacella novorossica Sinzov, 1897 †
- Species Parmacella olivieri Cuvier, 1805
- Species Parmacella persica Simroth, 1902
- Species Parmacella pontileviensis de Morgan, 1920 †
- Species Parmacella praelevanderi Korobkov, 1959 †
- Species Parmacella roseni Simroth, 1913 accepted as Candaharia levanderi (Simroth, 1902)
- Species Parmacella rutellum T. Hutton, 1849 accepted as Candaharia rutellum (T. Hutton, 1849)
- Species Parmacella sayni Fontannes, 1880 †
- Species Parmacella simrothi Germain, 1911 accepted as Parmacella ibera Eichwald, 1841
- Species Parmacella succini Klebs, 1886 †
- Species Parmacella tenerifensis M. R. Alonso, Ibáñez & Diaz, 1985 accepted as Drusia tenerifensis (M. R. Alonso, Ibáñez & Diaz, 1985)
- Species Parmacella unguiformis Gervais, 1869 †
- Species Parmacella valencienii [sic] accepted as Drusia valenciennii (P. B. Webb & Van Beneden, 1836)
- Species Parmacella valenciennesi P. B. Webb & van Beneden, 1836 accepted as Drusia valenciennii (P. B. Webb & Van Beneden, 1836)
- Species Parmacella valenciennii P. B. Webb & van Beneden, 1836 accepted as Drusia valenciennii (P. B. Webb & Van Beneden, 1836)
- Species Parmacella velitaris E. von Martens, 1880 accepted as Hyrcanolestes velitaris (E. von Martens, 1880)
- Genus Parmacellus accepted as Parmacella Cuvier, 1805
- Genus Phosphorax P. B. Webb & S. Berthelot, 1833 accepted as Parmacella Cuvier, 1805
- Genus Proparmacella Simroth, 1913 accepted as Candaharia Godwin-Austen, 1888
- Family Trigonochlamydidae Hesse, 1882 (11)
- Infraorder Oleacinoidei (497)
- Infraorder Orthalicoidei (1 578)
- 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