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)
- 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)
- Superfamily Bulloidea Gray, 1827 (262)
- Superfamily Cylichnoidea H. Adams & A. Adams, 1854 (215)
- Superfamily Diaphanoidea Odhner, 1914 (1857) accepted as Cylichnoidea H. Adams & A. Adams, 1854
- Superfamily Haminoeoidea Pilsbry, 1895 (143)
- Superfamily Newnesioidea Moles, Wägele, Schrödl & C. Ávila, 2017 (3)
- Superfamily Philinoidea J. E. Gray, 1850 (1815) (395)
- Family Aglajidae Pilsbry, 1895 (1847) (96)
- Family Alacuppidae Oskars, Bouchet & Malaquias, 2015 (38)
- Family Antarctophilinidae Moles, C. Ávila & Malaquias, 2019 (6)
- Family Bullaeidae Rafinesque, 1815 accepted as Philinidae J. E. Gray, 1850 (1815)
- Family Chelidonuridae Habe, 1961 accepted as Aglajidae Pilsbry, 1895 (1847)
- Family Colpodaspididae Oskars, Bouchet & Malaquias, 2015 (3)
- Family Doridiidae Gray, 1847 accepted as Aglajidae Pilsbry, 1895 (1847)
- Family Gasteropteridae accepted as Gastropteridae Swainson, 1840
- Family Gastropteridae Swainson, 1840 (42)
- Family Laonidae Pruvot-Fol, 1954 (13)
- Genus Laona A. Adams, 1865 (11)
- Species Laona alternans (van der Linden, 1995)
- Species Laona californica (Willett, 1944)
- Species Laona chilla (Ev. Marcus & Er. Marcus, 1969) accepted as Praephiline chilla (Ev. Marcus & Er. Marcus, 1969)
- Species Laona condensa (van der Linden, 1995)
- Species Laona confusa (Ohnheiser & Malaquias, 2013)
- Species Laona finmarchica (M. Sars, 1859) accepted as Praephiline finmarchica (M. Sars, 1859)
- Species Laona flexuosa (M. Sars, 1859) accepted as Laona pruinosa (W. Clark, 1827)
- Species Laona grandioculi (Ohnheiser & Malaquias, 2013)
- Species Laona nanseni Malaquias, Ohnheiser, Oskars & Willassen, 2016
- Species Laona pruinosa (W. Clark, 1827)
- Species Laona quadrata (S. V. Wood, 1839)
- Species Laona thurmanni (Ev. Marcus & Er. Marcus, 1969) accepted as Praephiline thurmanni (Ev. Marcus & Er. Marcus, 1969)
- Species Laona ventricosa (Jeffreys, 1865)
- Species Laona vestita (R. A. Philippi, 1840)
- Species Laona zonata A. Adams, 1865
- Genus Ossiania Monterosato, 1884 accepted as Laona A. Adams, 1865
- Genus Retusophiline F. Nordsieck, 1972 (2)
- Genus Rhinodiaphana Lemche, 1967 accepted as Laona A. Adams, 1865
- Genus Utriculopsis M. Sars, 1870 accepted as Laona A. Adams, 1865
- Family Philinidae J. E. Gray, 1850 (1815) (110)
- Family Philinoglossidae Hertling, 1932 (7)
- Family Philinorbidae Oskars, Bouchet & Malaquias, 2015 (3)
- Family Plusculidae Franc, 1968 accepted as Philinoglossidae Hertling, 1932
- Family Scaphandridae G. O. Sars, 1878 (77)
- Family Sinistrobranchidae A. d'Orbigny, 1841 accepted as Aglajidae Pilsbry, 1895 (1847)
- Family Triclidae Winckworth, 1932 accepted as Scaphandridae G. O. Sars, 1878
- Subfamily Laoninae Pruvot-Fol, 1954 accepted as Laonidae Pruvot-Fol, 1954
- Family Cephalaspidea incertae sedis (16)
- 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