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)
- Superfamily Achatinoidea Swainson, 1840 (1 329)
- Superfamily Streptaxoidea J. E. Gray, 1860 (1 571)
- Family Artemonidae Bourguignat, 1890 accepted as Streptaxinae J. E. Gray, 1860
- Family Diapheridae Panha & Naggs, 2010 (183)
- Family Enneidae Bourguignat, 1883 accepted as Enneinae Bourguignat, 1883
- Family Orthogibbidae Germain, 1921 accepted as Orthogibbinae Germain, 1921
- Family Streptaxidae J. E. Gray, 1860 (1 388)
- Subfamily Enneinae Bourguignat, 1883 (265)
- Subfamily Gibbinae Steenberg, 1936 accepted as Orthogibbinae Germain, 1921
- Subfamily Gonidominae Steenberg, 1936 accepted as Orthogibbinae Germain, 1921
- Subfamily Gulellinae Rowson, 2024 (548)
- Subfamily Marconiinae Schileyko, 2000 (49)
- Subfamily Odontartemoninae Schileyko, 2000 (39)
- Subfamily Orthogibbinae Germain, 1921 (165)
- Subfamily Primigulellinae Rowson, 2024 (41)
- Genus Aenigmigulella Pilsbry & T. D. A. Cockerell, 1933 (7)
- Genus Juventigulella Tattersfield, 1998 (8)
- Species Juventigulella amboniensis (Tattersfield, 1998)
- Species Juventigulella cryptophora (Morelet, 1881)
- Species Juventigulella habibui (Tattersfield, 1998)
- Species Juventigulella kimbozae (Verdcourt, 2004)
- Species Juventigulella ngerezae Rowson, 2007
- Species Juventigulella peakei (van Bruggen, 1975)
- Species Juventigulella saidii Rowson, Law, J. M. Miller, T. White, Shipton, Crowther, Ndiema, Petraglia & N. Boivin, 2024 †
- Species Juventigulella spinosa (Tattersfield, 1998)
- Genus Microstrophia Möllendorff, 1887 (9)
- Genus Mirellia Thiele, 1933 (2)
- Genus Primigulella Pilsbry, 1919 (15)
- Subfamily Ptychotrematinae Pilsbry, 1919 accepted as Enneinae Bourguignat, 1883
- Subfamily Streptaxinae J. E. Gray, 1860 (276)
- Genus Campolaemus Pilsbry, 1892 (1)
- Genus Goniodomulus Harzhauser & Neubauer, 2016 † (1)
- Genus Huttonella L. Pfeiffer, 1856 accepted as Gulella (Huttonella) L. Pfeiffer, 1856
- Genus Oppenheimiella Pfeffer, 1930 † accepted as Pfefferiola Harzhauser & Neubauer, 2021 †
- Genus Panhartemis Siriboon, 2023 (2)
- Genus Pfefferiola Harzhauser & Neubauer, 2021 † (1)
- Family Streptostelidae Bourguignat, 1890 accepted as Enneinae Bourguignat, 1883
- Suborder Elasmognatha accepted as Succineoidei
- Suborder Helicina (21 626)
- 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