Between brackets is the number of accepted species

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- Mollusca (133 377)
- Subphylum Aculifera
- Subphylum Conchifera
- Subphylum Placophora accepted as Polyplacophora
- Superclass Aplacophora
- Class Amphineura accepted as Aculifera
- Class Bivalvia (25 099)
- Class Caudofoveata (143)
- Class Cephalopoda (1 933)
- Class Conchifera accepted as Bivalvia
- Class Cricoconarida † (1)
- Class Gastropoda (103 088)
- Subclass Amphigastropoda † (439)
- Subclass Angiogastropoda represented as Gastropoda
- Subclass Apogastropoda
- Subclass Caenogastropoda (53 884)
- Subclass Gastropoda incertae sedis (313)
- Subclass Heterobranchia (39 230)
- Subclass Neomphaliones accepted as Vetigastropoda
- Subclass Neritimorpha (1 916)
- Order Cycloneritida (1 860)
- Superfamily Helicinoidea A. Férussac, 1822 (799)
- Superfamily Hydrocenoidea Troschel, 1857 (133)
- 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)
- Tribe Orthopomatini J. E. Gray, 1868 accepted as Neritininae Poey, 1852
- Genus Agapilia Harzhauser & Kowalke, 2001 † accepted as Vitta Mörch, 1852
- Genus Bourguignatia Brusina, 1884 †
- Genus Brusinaella Andrusov, 1912 † accepted as Theodoxus (Brusinaella) Andrusov, 1912 †
- Genus Calvertia Bourguignat, 1881 † accepted as Theodoxus (Calvertia) Bourguignat, 1881 †
- Genus Catillus J. E. Gray, 1847 accepted as Septaria J. B. Férussac, 1807
- Genus Chernites Gistel, 1848 accepted as Neritina Lamarck, 1816
- Genus Cimber Montfort, 1810 accepted as Septaria J. B. Férussac, 1807
- Genus Clithon Montfort, 1810 (86)
- Genus Clypeolum Récluz, 1842 (2)
- Genus Dostia J. E. Gray, 1842 accepted as Neripteron (Dostia) J. E. Gray, 1842
- Genus Elea Fitzinger, 1833 accepted as Neritina Lamarck, 1816
- Genus Fluvinerita Pilsbry, 1932 (2)
- Genus Laphrostoma Rafinesque, 1815 accepted as Neritina Lamarck, 1816
- Genus Manana Gabuniya, 1949 † (4)
- Genus Mananopsis Gabuniya, 1949 † (1)
- Genus Meganinnia Davitashvili, 1930 † accepted as Theodoxus (Meganinnia) Davitashvili, 1930 †
- Genus Mitrula Récluz, 1850 accepted as Dostia J. E. Gray, 1842
- Genus Navicella Lamarck, 1816 accepted as Septaria J. B. Férussac, 1807 (1)
- Genus Nereina De Cristofori & Jan, 1832 (4)
- Genus Neretina [sic] accepted as Neritina Lamarck, 1816
- Genus Neripteron R. P. Lesson, 1831 (26)
- Genus Neritella J. E. Gray, 1847 accepted as Neritina Lamarck, 1816
- Genus Neritina Lamarck, 1816 (67)
- Genus Neritinopsis Gabuniya, 1953 † (1)
- Genus Neritoconus Kobelt, 1871 accepted as Theodoxus (Neritaea) J. R. Roth, 1855
- Genus Neritodonta Brusina, 1884 accepted as Theodoxus (Calvertia) Bourguignat, 1881 †
- Genus Neritodryas E. von Martens, 1869 (8)
- Genus Neritoglobus Kobelt, 1871 accepted as Theodoxus Montfort, 1810
- Genus Neritona E. von Martens, 1869 (6)
- Genus Neritonyx Andrusov, 1912 † accepted as Theodoxus (Neritonyx) Andrusov, 1912 †
- Genus Neritoplica Oppenheim, 1892 † (9)
- Genus Neritopteron P. Fischer, 1885 accepted as Neripteron R. P. Lesson, 1831
- Genus Ninnia Brusina, 1903 accepted as Theodoxus Montfort, 1810
- Genus Ninniopsis Tomlin, 1930 † accepted as Theodoxus (Ninniopsis) Tomlin, 1930 †
- Genus Orthopoma J. E. Gray, 1868 accepted as Septaria J. B. Férussac, 1807
- Genus Paranerita Bourne, 1908 accepted as Vittina H. B. Baker, 1923
- Genus Paria J. E. Gray, 1868 accepted as Septaria J. B. Férussac, 1807
- Genus Pettretinia Bourguignat, 1881 † accepted as Theodoxus (Calvertia) Bourguignat, 1881 †
- Genus Pictoneritina Iredale, 1936 accepted as Clithon Montfort, 1810
- Genus Pseudonerita H. B. Baker, 1923 accepted as Neripteron (Pseudonerita) H. B. Baker, 1923
- Genus Puperita Gray, 1857 (2)
- Genus Saintsimonia Bourguignat, 1881 † accepted as Theodoxus (Calvertia) Bourguignat, 1881 †
- Genus Sandalium Schumacher, 1817 accepted as Septaria J. B. Férussac, 1807
- Genus Septaria J. B. Férussac, 1807 (13)
- Genus Serenia W. H. Benson, 1856 accepted as Neritona E. von Martens, 1869
- Genus Stenopoma J. E. Gray, 1868 accepted as Septaria J. B. Férussac, 1807
- Genus Tanalia Gray, 1847 accepted as Neritona E. von Martens, 1869
- Genus Theodoxia Bourguignat, 1877 accepted as Theodoxus Montfort, 1810
- Genus Theodoxis Montfort, 1810 accepted as Theodoxus Montfort, 1810
- Genus Theodoxus Montfort, 1810 (221)
- Genus Tonstrina Symonds & Gain, 2025 † (1)
- Genus Tripaloia Bourguignat, 1881 † accepted as Theodoxus (Calvertia) Bourguignat, 1881 †
- Genus Velatella Meek, 1873 † (4)
- Species Velatella ambrosana (Stephenson, 1952) †
- Species Velatella bellatula (Meek, 1873) †
- Species Velatella eocaenica Pacaud & Quaggiotto, 2011 †
- Species Velatella rectistriata Dyer, 1930 †
- Genus Vitta Mörch, 1852 (26)
- Genus Vittina H. B. Baker, 1923 (21)
- 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)
- 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 (45)
- Subclass Orthogastropoda represented as Gastropoda
- Subclass Patellogastropoda (517)
- Subclass Prosobranchia
- Subclass Psilogastropoda represented as Gastropoda
- Subclass Vetigastropoda (6 789)
- 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 (1 381)
- Class Polyplaxiphora accepted as Polyplacophora
- Class Rostroconchia † (64)
- Class Scaphopoda (754)
- Class Solenoconchia accepted as Scaphopoda
- Class Solenogastres (313)
- Subclass Chaetodermomorpha accepted as Caudofoveata