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)
- 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)
- Family Otostomidae Bandel, 2008 † (25)
- Family Parvulatopsidae Gründel, Keupp & F. Lang, 2015 † (1)
- Family Phenacolepadidae Pilsbry, 1895 (59)
- Subfamily Phenacolepadinae Pilsbry, 1895 (46)
- Genus Amapileus Iredale, 1929 accepted as Zacalantica Iredale, 1929
- Genus Cinnalepeta Iredale, 1929 accepted as Plesiothyreus Cossmann, 1888
- Genus Hyalopatina Dall, 1889 (3)
- Genus Magadis Melvill & Standen, 1899 (6)
- Genus Paraseptaria Risbec, 1942 accepted as Zacalantica Iredale, 1929
- Genus Phenacolepas Pilsbry, 1891 accepted as Plesiothyreus Cossmann, 1888
- Genus Plesiothyreus Cossmann, 1888 (30)
- Subgenus Plesiothyreus (Amapileus) Iredale, 1929 accepted as Zacalantica Iredale, 1929
- Species Plesiothyreus aculeatus (Pease, 1868)
- Species Plesiothyreus ancyliformis (Grateloup, 1828) †
- Species Plesiothyreus arabicus (Thiele, 1909)
- Species Plesiothyreus asperulatus (A. Adams, 1854) accepted as Phenacolepas galathea (Lamarck, 1819)
- Species Plesiothyreus brocki (Thiele, 1909)
- Species Plesiothyreus cancellatus (Pease, 1861)
- Species Plesiothyreus cinnamomeus (A. Gould, 1846)
- Species Plesiothyreus compressus (Pease, 1868)
- Species Plesiothyreus cosmani Jousseaume, 1894 accepted as Plesiothyreus cossmanni Jousseaume, 1894
- Species Plesiothyreus cossmanni Jousseaume, 1894
- Species Plesiothyreus cytherae (R. P. Lesson, 1831)
- Species Plesiothyreus elongatus (Thiele, 1909)
- Species Plesiothyreus evansi (H. E. J. Biggs, 1973)
- Species Plesiothyreus fischeri (Rochebrune, 1882)
- Species Plesiothyreus granocostatus (Pease, 1868)
- Species Plesiothyreus granulosus (Thiele, 1909)
- Species Plesiothyreus gruveli (Dautzenberg, 1929)
- Species Plesiothyreus guttatus (Thiele, 1909)
- Species Plesiothyreus hamillei (P. Fischer, 1857)
- Species Plesiothyreus indicus (Thiele, 1909)
- Species Plesiothyreus leganyii Csepreghy-Meznerics, 1969 †
- Species Plesiothyreus malonei (Vanatta, 1912)
- Species Plesiothyreus newtoni G. B. Sowerby III, 1894
- Species Plesiothyreus omanensis (H. E. J. Biggs, 1973)
- Species Plesiothyreus osculans (C. B. Adams, 1852)
- Species Plesiothyreus pararabicus (Christiaens, 1988)
- Species Plesiothyreus parmophoroides (Cossmann, 1885) †
- Species Plesiothyreus peelae Christiaens, 1989
- Species Plesiothyreus pliocenicus (Chirli, 2004) †
- Species Plesiothyreus puntarenae (Mörch, 1860)
- Species Plesiothyreus radiatus (Schepman, 1908)
- Species Plesiothyreus reticulatus (Thiele, 1909)
- Species Plesiothyreus rushii (Dall, 1889) accepted as Hyalopatina rushii (Dall, 1889)
- Species Plesiothyreus sacyi Cossmann & Peyrot, 1919 †
- Species Plesiothyreus scobinatus (A. Gould, 1859)
- Species Plesiothyreus tela (Ludbrook, 1941) †
- Genus Scutella Broderip, 1834 accepted as Plesiothyreus Cossmann, 1888
- Genus Scutellina Gray, 1847 accepted as Plesiothyreus Cossmann, 1888
- Genus Scutulina Cossmann, 1912 accepted as Plesiothyreus Cossmann, 1888
- Genus Seminerita [sic] † accepted as Semineritina Cossmann, 1925 †
- Genus Semineritina Cossmann, 1925 † accepted as Magadis Melvill & Standen, 1899
- Genus Zacalantica Iredale, 1929 (7)
- Subfamily Shinkailepadinae Okutani, Saito & Hashimoto, 1989 (13)
- 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