Between brackets is the number of accepted species

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- Mollusca (133 273)
- Subphylum Aculifera
- Subphylum Conchifera
- Subphylum Placophora accepted as Polyplacophora
- Superclass Aplacophora
- Class Amphineura accepted as Aculifera
- Class Bivalvia (25 082)
- Class Caudofoveata (143)
- Class Cephalopoda (1 917)
- Class Conchifera accepted as Bivalvia
- Class Cricoconarida † (1)
- Class Gastropoda (103 018)
- Subclass Amphigastropoda † (434)
- Subclass Angiogastropoda represented as Gastropoda
- Subclass Apogastropoda
- Subclass Caenogastropoda (53 827)
- Subclass Gastropoda incertae sedis (313)
- Subclass Heterobranchia (39 225)
- Subclass Neomphaliones accepted as Vetigastropoda
- Subclass Neritimorpha (1 916)
- Subclass Orthogastropoda represented as Gastropoda
- Subclass Patellogastropoda (514)
- Subclass Prosobranchia
- Subclass Psilogastropoda represented as Gastropoda
- Subclass Vetigastropoda (6 789)
- Order Anisobranchia accepted as Trochidae Rafinesque, 1815
- Order Cocculinida (69)
- Order Lepetellida (1 206)
- Superfamily Fissurelloidea J. Fleming, 1822 (717)
- Superfamily Haliotoidea Rafinesque, 1815 (94)
- Superfamily Lepetelloidea Dall, 1882 (104)
- Family Addisoniidae Dall, 1882 (7)
- Family Bathyphytophilidae Moskalev, 1978 (3)
- Family Caymanabyssiidae B. A. Marshall, 1986 (7)
- Family Cocculinellidae Moskalev, 1971 (4)
- Family Lepetellidae Dall, 1882 (21)
- Subfamily Choristellinae Bouchet & Warén, 1979 accepted as Choristellidae Bouchet & Warén, 1979
- Subfamily Lepetellinae Dall, 1882 accepted as Lepetellidae Dall, 1882
- Genus Bogia Dantart & Luque, 1994 (1)
- Genus Lepetella A. E. Verrill, 1880 (18)
- Genus Saptadanta Prashad & H. S. Rao, 1934 (1)
- Genus Tecticrater Dell, 1956 (1)
- Species Tecticrater cervae (C. A. Fleming, 1948) accepted as Pedococculina cervae (C. A. Fleming, 1948)
- Species Tecticrater compressus (Suter, 1908) accepted as Lepetella compressa (Suter, 1908)
- Species Tecticrater finlayi (A. W. B. Powell, 1937) accepted as Lepetella finlayi (A. W. B. Powell, 1937)
- Species Tecticrater grandis Crozier, 1966 accepted as Lepeta grandis (Crozier, 1966)
- Species Tecticrater praecompressa (Chapman & Gabriel, 1923) †
- Species Tecticrater subcompressus (A. W. B. Powell, 1937) accepted as Lepetella subcompressa (A. W. B. Powell, 1937)
- Genus Tectisumen H. J. Finlay, 1926 accepted as Lepetella A. E. Verrill, 1880
- Family Osteopeltidae B. A. Marshall, 1987 (5)
- Family Pseudococculinidae Hickman, 1983 (45)
- Family Pyropeltidae J. H. McLean & Haszprunar, 1987 (12)
- Superfamily Lepetodriloidea J. H. McLean, 1988 (34)
- Superfamily Scissurelloidea J. E. Gray, 1847 (257)
- Order Neomphalida (63)
- Order Pleurotomariida (698)
- Order Seguenziida (923)
- Order Trochida (3 802)
- Superfamily Fissurellacea accepted as Fissurelloidea J. Fleming, 1822
- Superfamily Trochacea accepted as Trochoidea Rafinesque, 1815
- Superfamily Turbinoidea Rafinesque, 1815 accepted as Trochoidea Rafinesque, 1815
- Superfamily Vetigastropoda incertae sedis (28)
- 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 (753)
- Class Solenoconchia accepted as Scaphopoda
- Class Solenogastres (313)
- Subclass Chaetodermomorpha accepted as Caudofoveata