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)
- Infraclass "Lower Heterobranchia" (1 137)
- Infraclass Euthyneura (37 449)
- Infraclass Heterobranchia incertae sedis (478)
- Order Architectibranchia represented as Heterobranchia incertae sedis
- Superfamily Acteonelloidea Gill, 1871 † (144)
- Superfamily Itieriacea Pchelintsev, 1965 † accepted as Nerineoidea Zittel, 1873 †
- Superfamily Nerineoidea Zittel, 1873 † (323)
- Family Aptyxiellidae Hacobjan, 1973 † accepted as Nerinellidae Pchelintsev, 1960 †
- Family Auroraellidae Pchelintsev, 1965 † accepted as Nerinellidae Pchelintsev, 1960 †
- Family Bactroptyxidae Pchelintsev, 1965 † accepted as Ptygmatisinae Pchelintsev, 1960 †
- Family Bactroptyxisidae Pchelintsev, 1965 † accepted as Bactroptyxidae Pchelintsev, 1965 †
- Family Ceritellidae Wenz, 1938 † (59)
- Family Cryptoplocusidae Pchelintsev, 1960 † accepted as Cryptoplocinae Pchelintsev, 1960 †
- Family Diptyxisidae Pchelintsev, 1960 † accepted as Ceritellidae Wenz, 1938 †
- Family Elatioriellidae Pchelintsev, 1965 † accepted as Nerinellidae Pchelintsev, 1960 †
- Family Elegantellidae Pchelintsev, 1965 † accepted as Nerinellidae Pchelintsev, 1960 †
- Family Eunerineidae Kollmann, 2005 † (13)
- Family Fibuloptygmatidae Hacobjan, 1973 † accepted as Nerineidae Zittel, 1873 †
- Family Fibuloptyxidae Pchelintsev, 1965 † accepted as Ceritellidae Wenz, 1938 †
- Family Fibuloptyxisidae Pchelintsev, 1965 † accepted as Fibuloptyxidae Pchelintsev, 1965 †
- Family Itieriidae Cossmann, 1896 † (41)
- Family Nerineidae Zittel, 1873 † (101)
- Family Nerinellidae Pchelintsev, 1960 † (50)
- Family Nerineoidea incertae sedis † (14)
- Family Phaneroptyxidae Pchelintsev, 1965 † accepted as Nerineidae Zittel, 1873 †
- Family Phaneroptyxisidae Pchelintsev, 1965 † accepted as Phaneroptyxidae Pchelintsev, 1965 †
- Family Polyptyxidae Pchelintsev, 1965 † accepted as Nerinellidae Pchelintsev, 1960 †
- Family Polyptyxisidae Pchelintsev, 1965 † accepted as Polyptyxidae Pchelintsev, 1965 †
- Family Pseudonerineidae Pchelintsev, 1965 † (8)
- Family Ptygmatididae Pchelintsev, 1960 † (37)
- Subfamily Cryptoplocinae Pchelintsev, 1960 † (10)
- Genus Conoplocus Pchelintsev, 1965 † accepted as Cryptoplocus F.-J. Pictet & Campiche, 1862 †
- Genus Cryptoplocus F.-J. Pictet & Campiche, 1862 † (10)
- Species Cryptoplocus carabijailensis Pchelintsev, 1965 †
- Species Cryptoplocus corpulensis (Pchelintsev, 1965) †
- Species Cryptoplocus depressus (Voltz, 1836) †
- Species Cryptoplocus gursufensis (Pchelintsev, 1965) †
- Species Cryptoplocus picteti Gemmellaro, 1869 †
- Species Cryptoplocus pissarensis Pchelintsev, 1965 †
- Species Cryptoplocus pupoidalis (Pchelintsev, 1965) †
- Species Cryptoplocus subpyramidalis (Münster, 1844) †
- Species Cryptoplocus tauricus Pchelintsev, 1965 †
- Species Cryptoplocus umbonatus Pchelintsev, 1965 †
- Species Cryptoplocus zitteli Gemmellaro, 1869 †
- Genus Endiaplocus Cossmann, 1896 †
- Genus Trochalia Sharpe, 1850 †
- Subfamily Umboneinae Lyssenko & Aliev, 1987 † (3)
- Genus Bactroptyxis Cossmann, 1896 † (8)
- Genus Ptygmatis Sharpe, 1850 † (16)
- Family Ptygmatisidae Pchelintsev, 1960 † accepted as Ptygmatididae Pchelintsev, 1960 †
- Family Triptyxidae Pchelintsev, 1965 † accepted as Nerinellidae Pchelintsev, 1960 †
- Family Triptyxisidae Pchelintsev, 1965 † accepted as Triptyxidae Pchelintsev, 1965 †
- Family Upellidae Pchelintsev, 1965 † accepted as Nerinellidae Pchelintsev, 1960 †
- Subfamily Diptyxinae Pchelintsev, 1960 † accepted as Ceritellidae Wenz, 1938 †
- Subfamily Ptygmatisinae Pchelintsev, 1960 † accepted as Ptygmatididae Pchelintsev, 1960 †
- Subfamily Simploptyxinae Hacobjan, 1973 † accepted as Nerineidae Zittel, 1873 †
- Superfamily Streptacidoidea Knight, 1931 † (10)
- Family Dolomitellidae Bandel, 1994 †
- Family Kuskokwimiidae Frýda & Blodgett, 2001 †
- Family Misurinellidae Bandel, 1994 †
- Genus Masaevia Guzhov & Shapovalov, 2019 † (1)
- 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