Between brackets is the number of accepted species

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- Mollusca (132 754)
- Subphylum Aculifera
- Subphylum Conchifera
- Subphylum Placophora accepted as Polyplacophora
- Superclass Aplacophora
- Class Amphineura accepted as Aculifera
- Class Bivalvia (24 992)
- Class Caudofoveata (143)
- Class Cephalopoda (1 832)
- Class Conchifera accepted as Bivalvia
- Class Cricoconarida † (1)
- Class Gastropoda (102 679)
- Subclass Amphigastropoda † (387)
- Subclass Angiogastropoda represented as Gastropoda
- Subclass Apogastropoda
- Subclass Caenogastropoda (53 623)
- Subclass Gastropoda incertae sedis (308)
- Subclass Heterobranchia (39 154)
- Infraclass "Lower Heterobranchia" (1 137)
- Infraclass Euthyneura (37 431)
- Subterclass Acteonimorpha (411)
- Subterclass Ringipleura (2 917)
- Subterclass Tectipleura (34 103)
- Superorder Acochlidiimorpha (48)
- Superorder Ascoglossa accepted as Sacoglossa
- Superorder Basommatophora accepted as Hygrophila
- Superorder Eupulmonata (25 567)
- Order Aillyida accepted as Achatinina
- Order Ellobiida (579)
- Order Gymnomorpha accepted as Systellommatophora
- Order Stylommatophora (24 764)
- Suborder Achatinina (2 899)
- Suborder Elasmognatha accepted as Succineoidei
- Suborder Helicina (21 625)
- Infraorder Arionoidei (140)
- Infraorder Clausilioidei (1 859)
- Infraorder Helicina incertae sedis (3 210)
- Infraorder Helicoidei (5 690)
- Superfamily Helicoidea Rafinesque, 1815 (5 491)
- Superfamily Sagdoidea Pilsbry, 1895 (199)
- Family Sagdidae Pilsbry, 1895 (115)
- Family Solaropsidae H. Nordsieck, 1986 (68)
- Subfamily Caracolinae Cuezzo, 2003 (14)
- Genus Caracolla Albers, 1850 accepted as Caracolus Montfort, 1810
- Genus Caracolus Montfort, 1810 (14)
- Genus Carocolla Albers, 1850 accepted as Caracolus Montfort, 1810
- Species Carocolla acutissima Lamarck, 1822 accepted as Lucerna lamarckii (A. Férussac, 1821)
- Species Carocolla angulata (A. Férussac, 1822) accepted as Parthena angulata (A. Férussac, 1822)
- Species Carocolla atomata Menke, 1828
- Species Carocolla bicolor Lamarck, 1822 accepted as Pachystyla bicolor (Lamarck, 1822)
- Species Carocolla bifasciata I. Lea, 1840
- Species Carocolla cumberlandiana I. Lea, 1840 accepted as Anguispira cumberlandiana cumberlandiana (I. Lea, 1840)
- Species Carocolla edgariana I. Lea, 1841 accepted as Stenotrema edgarianum (I. Lea, 1841)
- Species Carocolla eolina Duclos, 1834 accepted as Ceres eolina (Duclos, 1834)
- Species Carocolla fibula Reeve, 1842 accepted as Chloraea fibula (Reeve, 1842)
- Species Carocolla gargottae R. A. Philippi, 1836 accepted as Cernuella rugosa (Lamarck, 1822)
- Species Carocolla globosa Broderip, 1832 accepted as Isomeria globosa (Broderip, 1832)
- Species Carocolla grata Michelin, 1831 accepted as Rhynchotrochus grata (Michelin, 1831)
- Species Carocolla helicoides I. Lea, 1831 accepted as Xolotrema obstrictum (Say, 1821)
- Species Carocolla hispidula Lamarck, 1822 accepted as Canariella hispidula (Lamarck, 1822)
- Species Carocolla hydiana I. Lea, 1838 accepted as Labyrinthus plicatus (Born, 1778)
- Species Carocolla lapicidites (Boubée, 1831) † accepted as Parachloraea lapicidites (Boubée, 1831) †
- Species Carocolla limbata R. A. Philippi, 1836
- Species Carocolla listeri J. E. Gray, 1825 accepted as Obba listeri (J. E. Gray, 1825)
- Species Carocolla lonchostoma Menke, 1828 accepted as Oxychona lonchostoma (Menke, 1828)
- Species Carocolla mauritiana Lamarck, 1822 accepted as Pachystyla bicolor var. mauritiana (Lamarck, 1822)
- Species Carocolla novaehollandiae J. E. Gray, 1834 accepted as Thersites novaehollandiae (J. E. Gray, 1834)
- Species Carocolla planaria Lamarck, 1822 accepted as Canariella planaria (Lamarck, 1822)
- Species Carocolla quadridentata Broderip, 1832 accepted as Labyrinthus quadridentatus (Broderip, 1832)
- Species Carocolla scabrosa (A. Férussac, 1822) accepted as Helix marginata O. F. Müller, 1774
- Species Carocolla spinosa I. Lea, 1831 accepted as Stenotrema spinosum (I. Lea, 1831)
- Species Carocolla stoddartii J. E. Gray, 1834 accepted as Advena stoddartii (J. E. Gray, 1834)
- Species Carocolla subplanata Petit de la Saussaye, 1843 accepted as Labyrinthus subplanatus (Petit de la Saussaye, 1843)
- Species Carocolla trochiformis G. B. Sowerby I, 1827
- Species Carocolla uncigera Petit de la Saussaye, 1838 accepted as Labyrinthus uncigerus (Petit de la Saussaye, 1838)
- Genus Corocolla auct. accepted as Caracolus Montfort, 1810
- Genus Discodoma Swainson, 1840 accepted as Caracolus Montfort, 1810
- Genus Serpentulus H. Adams & A. Adams, 1855 accepted as Caracolus Montfort, 1810
- Genus Vortex Oken, 1815 accepted as Caracolus Montfort, 1810
- Genus Wurtzorbis G. R. Webb, 1970 accepted as Caracolus Montfort, 1810
- Subfamily Solaropsinae H. Nordsieck, 1986 (54)
- Genus Solaropsidae incertae sedis
- Family Zachrysiidae D. G. Robinson, Sei & Rosenberg, 2017 (16)
- Infraorder Limacoidei (4 250)
- 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