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)
- Family Naticopsidae W. H. Waagen, 1880 † (43)
- Subfamily Ampezzonaticopsinae Bandel, 2007 † (2)
- Subfamily Hologyrinae Kittl, 1899 † (4)
- Subfamily Naticopsinae W. H. Waagen, 1880 † (31)
- Genus Colpites Knight, 1936 † (1)
- Genus Naticopsis McCoy, 1842 † (29)
- Subgenus Naticopsis (Fedaiella) Kittl, 1894 † accepted as Fedaiella Kittl, 1894 †
- Subgenus Naticopsis (Naticopsis) McCoy, 1842 † accepted as Naticopsis McCoy, 1842 †
- Subgenus Naticopsis (Paffrathopsis) Frýda, 2000 † represented as Naticopsis McCoy, 1842 †
- Species Naticopsis (Paffrathopsis) subcostata (d'Archiac & Verneuil, 1842) † represented as Naticopsis subcostata (d'Archiac & Verneuil, 1842) †
- Species Naticopsis ampliata (J. Phillips, 1836) †
- Species Naticopsis brevis de Koninck, 1881 †
- Species Naticopsis depressispirus Batten & Stokes, 1986 † accepted as Abrekopsis depressispirus (Batten & Stokes, 1986) †
- Species Naticopsis diminuta Stauffer & Schroyer, 1920 † accepted as Anthracopupa ohioensis Whitfield, 1881 †
- Species Naticopsis fasciata Hayasaka, 1943 †
- Species Naticopsis globulina de Koninck, 1881 †
- Species Naticopsis glomerosa M. Gordon & Yochelson, 1983 †
- Species Naticopsis hollidayi Meek & Worthen, 1861 †
- Species Naticopsis inlabroerecta X.-D. Qiao, 1983 †
- Species Naticopsis kaibabensis Chronic, 1952 †
- Species Naticopsis khurensis W. H. Waagen, 1880 †
- Species Naticopsis kokeni Yakovlev, 1899 †
- Species Naticopsis koljanuriensis Mazaev, 2015 †
- Species Naticopsis longcaogouensis Y.-T. Pan, 1978 †
- Species Naticopsis magnifica C. L. Webster, 1905 †
- Species Naticopsis mammillaris de Koninck, 1881 †
- Species Naticopsis mediterranea Gemmellaro, 1889 †
- Species Naticopsis minima (T. Brown, 1839) †
- Species Naticopsis minoensis Hayasaka, 1943 †
- Species Naticopsis minuta Yoo, 1994 †
- Species Naticopsis nodosus Meek & Worthen, 1861 † accepted as Trachydomia nodosa (Meek & Worthen, 1861) †
- Species Naticopsis oblatus Winters, 1963 † accepted as Naticopsis permica Netchaev, 1894 †
- Species Naticopsis obsoleta de Koninck, 1881 †
- Species Naticopsis osbornei Yoo, 1988 †
- Species Naticopsis ovoidea de Koninck, 1881 †
- Species Naticopsis permica Netchaev, 1894 †
- Species Naticopsis petricola Gemmellaro, 1889 †
- Species Naticopsis piriformis Mansuy, 1912 †
- Species Naticopsis placida de Koninck, 1881 †
- Species Naticopsis praealta Wanner, 1922 †
- Species Naticopsis propinqua de Koninck, 1881 †
- Species Naticopsis sirodoti Munier-Chalmas, 1876 †
- Species Naticopsis sokensis Mazaev, 2020 †
- Species Naticopsis spallanzanii Gemmellaro, 1889 †
- Species Naticopsis subcostata (d'Archiac & Verneuil, 1842) †
- Species Naticopsis tschernyschewi Yakovlev, 1899 †
- Species Naticopsis uhligi Kittl, 1892 † accepted as Pachyomphalus uhligi (Kittl, 1892) †
- Species Naticopsis variata (J. Phillips, 1836) †
- Species Naticopsis wakimizui Hayasaka, 1943 †
- Species Naticopsis yinganensis X.-D. Qiao, 1983 †
- Genus Paffrathia Frýda, 2000 † (1)
- Genus Dicosmos Canavari, 1891 † (1)
- Genus Fuersichella Schneider & Werner, 2007 † (1)
- Genus Marmolatella Kittl, 1894 † (4)
- Family Scalaneritinidae Bandel, 2007 † (6)
- Family Trachyspiridae Nützel, Frýda, Yancey & J. R. Anderson, 2007 † (10)
- Family Tricolnaticopsidae Bandel, 2007 † (5)
- Superfamily Neritoidea Rafinesque, 1815 (802)
- 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