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)
- Infraorder Oleacinoidei (497)
- Superfamily Haplotrematoidea H. B. Baker, 1925 (20)
- Superfamily Oleacinoidea H. Adams & A. Adams, 1855 (477)
- Family Glandinidae Bourguignat, 1877 accepted as Oleacinidae H. Adams & A. Adams, 1855
- Family Oleacinidae H. Adams & A. Adams, 1855 (117)
- Subfamily Oleacininae H. Adams & A. Adams, 1855 (22)
- Subfamily Varicellinae H. B. Baker, 1941 (95)
- Genus Biangulaxis Pilsbry, 1907 (1)
- Genus Costavarix H. B. Baker, 1935 (8)
- Genus Euvaricella H. B. Baker, 1935 (19)
- Genus Laevaricella Pilsbry, 1907 (6)
- Genus Melaniella L. Pfeiffer, 1857 (5)
- Genus Pichardiella P. Fischer, 1887 accepted as Melaniella L. Pfeiffer, 1857
- Genus Sigmataxis Pilsbry, 1907 (15)
- Genus Vagavarix H. B. Baker, 1941 (7)
- Genus Varicella L. Pfeiffer, 1854 (34)
- Subgenus Varicella (Costavarix) H. B. Baker, 1935 accepted as Costavarix H. B. Baker, 1935
- Subgenus Varicella (Euvaricella) H. B. Baker, 1935 accepted as Euvaricella H. B. Baker, 1935
- Subgenus Varicella (Laevaricella) Pilsbry, 1907 accepted as Laevaricella Pilsbry, 1907
- Subgenus Varicella (Melaniella) L. Pfeiffer, 1857 accepted as Melaniella L. Pfeiffer, 1857
- Subgenus Varicella (Pichardiella) P. Fischer, 1887 accepted as Melaniella L. Pfeiffer, 1857
- Subgenus Varicella (Sigmataxis) Pilsbry, 1907 accepted as Sigmataxis Pilsbry, 1907
- Subgenus Varicella (Vagavarix) H. B. Baker, 1941 accepted as Vagavarix H. B. Baker, 1941
- Subgenus Varicella (Varicella) L. Pfeiffer, 1854 represented as Varicella L. Pfeiffer, 1854
- Subgenus Varicella (Varicellaria) Pilsbry, 1907 represented as Varicella L. Pfeiffer, 1854
- Species Varicella (Varicellaria) griffithii (C. B. Adams, 1845) represented as Varicella griffithii (C. B. Adams, 1845)
- Species Varicella (Varicellaria) jamaicensis (L. Pfeiffer, 1846) represented as Varicella jamaicensis (L. Pfeiffer, 1846)
- Species Varicella (Varicellaria) ligata (C. B. Adams, 1849) represented as Varicella ligata (C. B. Adams, 1849)
- Species Varicella (Varicellaria) necrodes H. B. Baker, 1935 represented as Varicella necrodes H. B. Baker, 1935
- Species Varicella (Varicellaria) philippiana L. Pfeiffer, 1846 represented as Varicella philippiana (L. Pfeiffer, 1846)
- Species Varicella (Varicellaria) subdola H. B. Baker, 1935 represented as Varicella subdola H. B. Baker, 1935
- Subgenus Varicella (Varicellidea) Pilsbry, 1907 represented as Varicella L. Pfeiffer, 1854
- Subgenus Varicella (Varicellina) Pilsbry, 1907 represented as Varicella L. Pfeiffer, 1854
- Subgenus Varicella (Varicellopsis) Pilsbry, 1907 represented as Varicella L. Pfeiffer, 1854
- Subgenus Varicella (Varicellula) Pilsbry, 1907 represented as Varicella L. Pfeiffer, 1854
- Species Varicella acuticostata (A. d'Orbigny, 1846) accepted as Melaniella acuticostata (A. d'Orbigny, 1841)
- Species Varicella beatensis Bartsch, 1932
- Species Varicella biplicata (Weinland & E. von Martens, 1859)
- Species Varicella blandiana (C. B. Adams, 1850)
- Species Varicella burringtonbakeri Pilsbry, 1933
- Species Varicella calderoni H. B. Baker, 1941 accepted as Vagavarix calderoni (H. B. Baker, 1941)
- Species Varicella capsula Pilsbry, 1933 accepted as Vagavarix capsula (Pilsbry, 1933)
- Species Varicella caymanensis Pilsbry, 1942
- Species Varicella clathrata Pilsbry, 1933
- Species Varicella costulosa (C. B. Adams, 1850)
- Species Varicella curvilabris (L. Pfeiffer, 1846)
- Species Varicella cylindrica H. B. Baker, 1935 accepted as Sigmataxis cylindricus (H. B. Baker, 1935)
- Species Varicella deflorescens (Vendryes, 1901)
- Species Varicella denticulata (Weinland, 1880)
- Species Varicella dissimilis Pilsbry, 1909 accepted as Euvaricella biplicatula dissimilis (Pilsbry, 1909)
- Species Varicella distans Pilsbry, 1933 accepted as Vagavarix distans (Pilsbry, 1933)
- Species Varicella dominicensis (Gmelin, 1791)
- Species Varicella elata (L. Pfeiffer, 1857)
- Species Varicella gracillima (L. Pfeiffer, 1839) accepted as Melaniella gracillima (L. Pfeiffer, 1839)
- Species Varicella griffithii (C. B. Adams, 1845)
- Species Varicella histrio (L. Pfeiffer, 1866)
- Species Varicella impressa (L. Pfeiffer, 1853) accepted as Vagavarix impressa (L. Pfeiffer, 1853)
- Species Varicella jamaicensis (L. Pfeiffer, 1846)
- Species Varicella leucozonias (Gmelin, 1791)
- Species Varicella lewisi Pilsbry, 1949 accepted as Varicella caymanensis Pilsbry, 1942
- Species Varicella ligata (C. B. Adams, 1849)
- Species Varicella mandevillensis Pilsbry, 1907 accepted as Costavarix mandevillensis (Pilsbry, 1907)
- Species Varicella manzanillensis (L. Pfeiffer, 1857) accepted as Melaniella manzanillensis (L. Pfeiffer, 1857)
- Species Varicella necrodes H. B. Baker, 1935
- Species Varicella nesiotes F. G. Thompson, 1987 accepted as Sigmataxis nesiotes (F. G. Thompson, 1987)
- Species Varicella paradisensis Pilsbry, 1933
- Species Varicella peruviana (Lamarck, 1822)
- Species Varicella philippiana (L. Pfeiffer, 1846)
- Species Varicella pinchoti Pilsbry, 1930
- Species Varicella portoricensis (L. Pfeiffer, 1849) accepted as Vagavarix portoricensis (L. Pfeiffer, 1849)
- Species Varicella propinqua (C. B. Adams, 1845)
- Species Varicella proxima (C. B. Adams, 1851)
- Species Varicella ptychoraphe (Weinland & E. von Martens, 1859)
- Species Varicella puella (C. B. Adams, 1850)
- Species Varicella rapax Pilsbry & A. P. Brown, 1910
- Species Varicella richardi (L. Pfeiffer, 1854)
- Species Varicella samana Pilsbry, 1933
- Species Varicella semitarum (L. Pfeiffer, 1842) accepted as Laevaricella semitarum (L. Pfeiffer, 1842)
- Species Varicella similaris Pilsbry, 1907 accepted as Euvaricella similaris (Pilsbry, 1907)
- Species Varicella sporadica H. B. Baker, 1941 accepted as Vagavarix sporadica (H. B. Baker, 1941)
- Species Varicella subdola H. B. Baker, 1935
- Species Varicella tenera (C. B. Adams, 1850)
- Species Varicella terebraeformis (Shuttleworth, 1854) accepted as Vagavarix terebraeformis (Shuttleworth, 1854)
- Species Varicella texta (Weinland & E. von Martens, 1860)
- Species Varicella trinitaria (Poey, 1858)
- Species Varicella vicina (C. B. Adams, 1845)
- Genus Euachatina Shuttleworth, 1856 accepted as Achatina Lamarck, 1799
- Genus Metaglandina Pfeffer, 1930 †
- Genus Paraglandina Pfeffer, 1930 † accepted as Pseudoleacina Wenz, 1915 †
- Family Spiraxidae H. B. Baker, 1939 (360)
- 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
