Between brackets is the number of accepted species

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- Mollusca (132 848)
- Subphylum Aculifera
- Subphylum Conchifera
- Subphylum Placophora accepted as Polyplacophora
- Superclass Aplacophora
- Class Amphineura accepted as Aculifera
- Class Bivalvia (25 011)
- Class Caudofoveata (143)
- Class Cephalopoda (1 834)
- Class Conchifera accepted as Bivalvia
- Class Cricoconarida † (1)
- Class Gastropoda (102 752)
- Subclass Amphigastropoda † (396)
- Subclass Angiogastropoda represented as Gastropoda
- Subclass Apogastropoda
- Subclass Caenogastropoda (53 669)
- Subclass Gastropoda incertae sedis (308)
- Subclass Heterobranchia (39 172)
- Subclass Neomphaliones accepted as Vetigastropoda
- Subclass Neritimorpha (1 914)
- Order Cycloneritida (1 859)
- Superfamily Helicinoidea A. Férussac, 1822 (799)
- Superfamily Hydrocenoidea Troschel, 1857 (132)
- Superfamily Naticopsoidea W. H. Waagen, 1880 † (64)
- Superfamily Neritoidea Rafinesque, 1815 (802)
- Family Cortinellidae Bandel, 2000 † (2)
- Family Neridomidae Bandel, 2008 † (8)
- Family Neritariidae Wenz, 1938 † (6)
- Family Neritidae Rafinesque, 1815 (695)
- Subfamily Neritellinae Gray, 1847 accepted as Neritinae Rafinesque, 1815
- Subfamily Neritinae Rafinesque, 1815 (140)
- Subfamily Neritininae Poey, 1852 (505)
- Subfamily Smaragdiinae H. B. Baker, 1923 accepted as Neritinae Rafinesque, 1815
- Subfamily Smaragdiinae H. B. Baker, 1923 accepted as Neritinae Rafinesque, 1815
- Subfamily Theodoxinae Bandel, 2001 accepted as Neritininae Poey, 1852
- Subfamily Velatinae Bandel, 2001 † (4)
- Tribe Neritinini Poey, 1852 accepted as Neritininae Poey, 1852
- Tribe Septariini Jousseaume, 1894 accepted as Neritininae Poey, 1852
- Tribe Stenopomatini J. E. Gray, 1868 accepted as Neritininae Poey, 1852
- Tribe Theodoxini Bandel, 2001 accepted as Neritininae Poey, 1852
- Genus Abrekopsis Kaim, 2009 † (1)
- Genus Calyptronerita Le Renard, 1980 † (1)
- Genus Cuisenerita Symonds & Pacaud, 2010 † (2)
- Genus Lissochilus Zittel, 1882 † (5)
- Species Lissochilus bicinctus (J. Phillips, 1871) †
- Species Lissochilus buvignieri (J. Morris & Lycett, 1851) †
- Species Lissochilus concinnus (Roemer, 1836) †
- Species Lissochilus pellati (de Loriol, 1874) †
- Species Lissochilus pellatus (de Loriol, 1874) † accepted as Lissochilus pellati (de Loriol, 1874) †
- Species Lissochilus sigaretinus (Buvignier, 1843) †
- Genus Mesoneritina Yen, 1946 † (7)
- Genus Monsneritina Kowalke, 2002 † (13)
- Genus Neritoma J. Morris, 1849 † (2)
- Genus Neritoptyx Oppenheim, 1892 † (3)
- Genus Panneritina Salvador & T.-T. Yu, 2022 † (7)
- Genus Tomostoma Deshayes, 1824 † (4)
- Genus Vergnesia Delpey, 1941 † (1)
- Family Otostomidae Bandel, 2008 † (25)
- Family Parvulatopsidae Gründel, Keupp & F. Lang, 2015 † (1)
- Family Phenacolepadidae Pilsbry, 1895 (59)
- Family Pileolidae Bandel, Gründel & P. A. Maxwell, 2000 † (5)
- Family Protoneritidae Kittl, 1899 † accepted as Neritariidae Wenz, 1938 † (1)
- Family Scutellidae Angas, 1871 accepted as Phenacolepadidae Pilsbry, 1895
- Family Scutellinidae Dall, 1889 accepted as Phenacolepadidae Pilsbry, 1895
- Family Septariidae Jousseaume, 1894 accepted as Neritidae Rafinesque, 1815
- Family Shinkailepadidae Okutani, Saito & Hashimoto, 1989 accepted as Shinkailepadinae Okutani, Saito & Hashimoto, 1989
- Subfamily Septariinae Jousseaume, 1894 accepted as Neritinae Rafinesque, 1815
- Superfamily Neritopsoidea J. E. Gray, 1847 (60)
- Superfamily Symmetrocapuloidea Wenz, 1938 † (2)
- Order Cycloneritimorpha accepted as Cycloneritida
- Order Cyrtoneritida † (11)
- Order Cyrtoneritimorpha † accepted as Cyrtoneritida †
- Order Neritimorpha incertae sedis (44)
- 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