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)
- Order Systellommatophora (224)
- Superfamily Onchidioidea Rafinesque, 1815 (69)
- Family Hoffmannolidae Starobogatov, 1976 accepted as Onchidiinae Rafinesque, 1815
- Family Onchidellidae Labbé, 1934 accepted as Onchidiinae Rafinesque, 1815
- Family Onchidiidae Rafinesque, 1815 (69)
- Subfamily Onchidellinae Labbé, 1934 (13)
- Subfamily Onchidiinae Rafinesque, 1815 (56)
- Genus Alionchis Goulding & Dayrat, 2018 (1)
- Genus Elophilus Labbé, 1935 accepted as Onchidium Buchannan, 1800
- Genus Eudrastus Gistel, 1848 accepted as Peronia J. Fleming, 1822
- Genus Labbella Starobogatov, 1970 accepted as Onchidium Buchannan, 1800
- Genus Laspionchis Dayrat & Goulding, 2019 (2)
- Genus Lessonia Labbé, 1934 accepted as Lessonina Starobogatov, 1976
- Genus Lessonina Starobogatov, 1976 accepted as Peronia J. Fleming, 1822
- Genus Marmaronchis Dayrat & Goulding, 2018 (2)
- Genus Melayonchis Dayrat & Goulding, 2017 (6)
- Genus Onchidina C. Semper, 1882 (1)
- Genus Onchidium Buchannan, 1800 (6)
- Genus Onchis A. Férussac, 1822 accepted as Peronia J. Fleming, 1822
- Genus Oncidina Plate, 1893 accepted as Onchidina C. Semper, 1882
- Genus Oncidium [sic] accepted as Onchidium Buchannan, 1800
- Genus Oncis Plate, 1893 accepted as Platevindex H. B. Baker, 1938
- Genus Paraoncidium Starobogatov, 1976 accepted as Onchidina C. Semper, 1882
- Genus Paraoncidium Labbé, 1934 accepted as Paraoncidium Starobogatov, 1976
- Genus Paraperonia Starobogatov, 1976 accepted as Peronia J. Fleming, 1822
- Genus Paromoionchis Dayrat & Goulding, 2019 (5)
- Genus Peronia J. Fleming, 1822 (9)
- Genus Peronina Plate, 1893 (2)
- Genus Platevindex H. B. Baker, 1938 (9)
- Genus Quoya Labbé, 1934 accepted as Peronia J. Fleming, 1822
- Genus Quoyella Starobogatov, 1976 accepted as Peronia J. Fleming, 1822
- Genus Scaphis Starobogatov, 1976 accepted as Peronia J. Fleming, 1822
- Genus Semperella Labbé, 1934 accepted as Semperoncis Starobogatov, 1976
- Genus Semperoncis Starobogatov, 1976 (3)
- Genus Wallaconchis Goulding & Dayrat, 2018 (10)
- Genus Orchidium [sic] accepted as Onchidium Buchannan, 1800
- Family Onchidinidae Starobogatov, 1976 accepted as Onchidiinae Rafinesque, 1815
- Family Peroniidae W. Keferstein, 1865 accepted as Onchidiinae Rafinesque, 1815
- Family Peroninidae Starobogatov, 1976 accepted as Onchidiinae Rafinesque, 1815
- Family Platevindecidae Starobogatov, 1976 accepted as Onchidiinae Rafinesque, 1815
- Family Quoyellidae Starobogatov, 1976 accepted as Onchidiinae Rafinesque, 1815
- Family Scaphidae Labbé, 1934 accepted as Onchidiinae Rafinesque, 1815
- Superfamily Veronicelloidea J. E. Gray, 1840 (154)
- Genus Granulilimax Minato, 1989 (1)
- 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