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)
- Superfamily Achatinoidea Swainson, 1840 (1 329)
- Family Achatinidae Swainson, 1840 (1 232)
- Subfamily Achatininae Swainson, 1840 (198)
- Subfamily Callistoplepinae Mead, 1994 accepted as Callistoplepini Mead, 1994
- Subfamily Coeliaxinae Pilsbry, 1907 (21)
- Subfamily Cryptelasminae Germain, 1916 (2)
- Subfamily Glessulinae Godwin-Austen, 1920 (130)
- Subfamily Limicolariinae Schileyko, 1999 accepted as Limicolariini Schileyko, 1999
- Subfamily Opeatinae Thiele, 1931 (83)
- Subfamily Petriolinae Schileyko, 1999 (214)
- Subfamily Pyrgininae Germain, 1916 (2)
- Subfamily Rishetiinae Schileyko, 1999 (53)
- Subfamily Rumininae Wenz, 1923 (22)
- Genus Cylindrina Schlüter, 1838 accepted as Rumina Risso, 1826
- Genus Eburnea Mousson, 1888 accepted as Xerocerastus Kobelt & Möllendorff, 1902
- Genus Krapfiella Preston, 1911 (4)
- Genus Lubricetta F. Haas, 1928 (4)
- Genus Namibiella Zilch, 1954 (3)
- Genus Orbitina Risso, 1826 accepted as Rumina Risso, 1826
- Genus Rumina Risso, 1826 (3)
- Genus Sira A. Schmidt, 1855 accepted as Rumina Risso, 1826
- Genus Xerocerastus Kobelt & Möllendorff, 1902 (8)
- Subgenus Xerocerastus (Lubricetta) F. Haas, 1928 accepted as Lubricetta F. Haas, 1928
- Subgenus Xerocerastus (Namibiella) Zilch, 1954 accepted as Namibiella Zilch, 1954
- Species Xerocerastus (Namibiella) herero Zilch, 1939 accepted as Namibiella herero (Zilch, 1939)
- Species Xerocerastus (Namibiella) hottentotus (J. E. Gray, 1838) accepted as Namibiella hottentota (J. E. Gray, 1838)
- Species Xerocerastus (Namibiella) ovulum Connolly, 1941 accepted as Namibiella ovulum (Connolly, 1941)
- Subgenus Xerocerastus (Xerocerastus) Kobelt & Möllendorff, 1902 accepted as Xerocerastus Kobelt & Möllendorff, 1902
- Species Xerocerastus burchelli (J. E. Gray, 1834)
- Species Xerocerastus damarensis (H. Adams, 1870)
- Species Xerocerastus eulimoides (J. E. Gray, 1838)
- Species Xerocerastus herero Zilch, 1939 accepted as Namibiella herero (Zilch, 1939)
- Species Xerocerastus hottentotus (Gray, 1838) accepted as Namibiella hottentota (J. E. Gray, 1838)
- Species Xerocerastus minutus Zilch, 1939
- Species Xerocerastus namibicus (O. Boettger, 1910)
- Species Xerocerastus niethammeri Zilch, 1939 accepted as Lubricetta niethammeri (Zilch, 1939)
- Species Xerocerastus nitens (Degner, 1922) accepted as Lubricetta nitens (Degner, 1922)
- Species Xerocerastus ovulum Connolly, 1941 accepted as Namibiella ovulum (Connolly, 1941)
- Species Xerocerastus pegeoides Zilch, 1939
- Species Xerocerastus robustus (Degner, 1922)
- Species Xerocerastus schultzei (O. Boettger, 1910)
- Species Xerocerastus sericus (Degner, 1922) accepted as Lubricetta serica (Degner, 1922)
- Species Xerocerastus subteres (O. Boettger, 1910) accepted as Lubricetta subteres (O. Boettger, 1910)
- Subfamily Stenogyrinae P. Fischer & Crosse, 1877 (76)
- Subfamily Subulininae P. Fischer & Crosse, 1877 (425)
- Subfamily Thyrophorellinae Girard, 1895 (1)
- Genus Arabicolaria Harzhauser & Neubauer, 2016 † (3)
- Genus Pacaudiella Harzhauser & Neubauer, 2016 † (2)
- Family Aillyidae H. B. Baker, 1955 (2)
- Family Ferrussacidae Bourguignat, 1883 accepted as Ferussaciidae Bourguignat, 1883
- Family Ferussaciidae Bourguignat, 1883 (94)
- Family Glessulidae Godwin-Austen, 1920 accepted as Glessulinae Godwin-Austen, 1920
- Family Micractaeonidae Schileyko, 1999 (1)
- Family Stenogyridae P. Fischer & Crosse, 1877 accepted as Stenogyrinae P. Fischer & Crosse, 1877
- Family Subulinidae P. Fischer & Crosse, 1877 accepted as Subulininae P. Fischer & Crosse, 1877
- Family Thyrophorellidae Girard, 1895 accepted as Thyrophorellinae Girard, 1895
- Superfamily Streptaxoidea J. E. Gray, 1860 (1 583)
- Suborder Elasmognatha accepted as Succineoidei
- Suborder Helicina (21 636)
- 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