Between brackets is the number of accepted species

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- Mollusca (132 754)
- Subphylum Aculifera
- Subphylum Conchifera
- Subphylum Placophora accepted as Polyplacophora
- Superclass Aplacophora
- Class Amphineura accepted as Aculifera
- Class Bivalvia (24 992)
- Class Caudofoveata (143)
- Class Cephalopoda (1 832)
- Class Conchifera accepted as Bivalvia
- Class Cricoconarida † (1)
- Class Gastropoda (102 679)
- Subclass Amphigastropoda † (387)
- Subclass Angiogastropoda represented as Gastropoda
- Subclass Apogastropoda
- Subclass Caenogastropoda (53 623)
- Subclass Gastropoda incertae sedis (308)
- Subclass Heterobranchia (39 154)
- 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)
- Order Anisobranchia accepted as Trochidae Rafinesque, 1815
- Order Cocculinida (69)
- Order Lepetellida (1 205)
- Superfamily Fissurelloidea J. Fleming, 1822 (716)
- Family Clypidinidae A. N. Golikov & Starobogatov, 1989 accepted as Emarginulinae Children, 1834
- Family Emarginulidae Children, 1834 accepted as Emarginulinae Children, 1834
- Family Fissurellidae J. Fleming, 1822 (716)
- Subfamily Diodorinae Odhner, 1932 accepted as Fissurellideinae Pilsbry, 1890
- Subfamily Emarginulinae Children, 1834 (272)
- Subfamily Fissurellidae incertae sedis (5)
- Subfamily Fissurellideinae Pilsbry, 1890 (149)
- Subfamily Fissurellinae J. Fleming, 1822 (110)
- Subfamily Hemitominae Kuroda & Habe, 1971 accepted as Zeidorinae Naef, 1913
- Subfamily Rimulinae Anton, 1838 (20)
- Subfamily Zeidorinae Naef, 1913 (160)
- Genus Cemoria Risso, 1826 accepted as Puncturella R. T. Lowe, 1827
- Genus Cornisepta J. H. McLean & D. L. Geiger, 1998 (18)
- Genus Cranopsis A. Adams, 1860 (2)
- Genus Crepiemarginula G. Seguenza, 1880 † accepted as Zeidora A. Adams, 1860
- Genus Hemimarginula J. H. McLean, 2011 (7)
- Genus Hemitoma Swainson, 1840 (5)
- Subgenus Hemitoma (Montfortia) Récluz, 1843 accepted as Montfortia Récluz, 1843
- Species Hemitoma chiquita Hertlein & A. M. Strong, 1951 accepted as Hemitoma natlandi Durham, 1950
- Species Hemitoma cratitia (A. Adams, 1852)
- Species Hemitoma cumingii (G. B. Sowerby II, 1863)
- Species Hemitoma emarginata (Blainville, 1825) accepted as Montfortia emarginata (Blainville, 1825)
- Species Hemitoma hermosa H. N. Lowe, 1935 accepted as Montfortia hermosa (H. N. Lowe, 1935)
- Species Hemitoma imbricata (A. Adams, 1852)
- Species Hemitoma lamberti (Souverbie, 1875)
- Species Hemitoma livescens (Reeve, 1855) accepted as Cellana livescens (Reeve, 1855)
- Species Hemitoma natlandi Durham, 1950 accepted as Octomarginula natlandi (Durham, 1950)
- Species Hemitoma octoradiata (Gmelin, 1791)
- Species Hemitoma panhi (Quoy & Gaimard, 1834) accepted as Montfortista panhi (Quoy & Gaimard, 1834)
- Species Hemitoma polygonalis (A. Adams, 1852) accepted as Montfortia polygonalis (A. Adams, 1852)
- Species Hemitoma profunda (Deshayes, 1863) accepted as Eoacmaea profunda (Deshayes, 1863)
- Species Hemitoma radiola (Lamarck, 1803) † accepted as Montfortula radiola (Lamarck, 1803) †
- Species Hemitoma raynevali Bellardi, 1877 †
- Species Hemitoma rubida A. H. Verrill, 1950 accepted as Hemitoma octoradiata (Gmelin, 1791)
- Species Hemitoma rugosa (H. Adams, 1872) accepted as Hemimarginula subrugosa (Thiele, 1916)
- Species Hemitoma scrippsae Durham, 1950 † accepted as Hemitoma natlandi Durham, 1950
- Species Hemitoma scutellata (Deshayes, 1863) accepted as Octomarginula scutellata (Deshayes, 1863)
- Species Hemitoma subemarginata (Blainville, 1819) accepted as Montfortia subemarginata (Blainville, 1819)
- Species Hemitoma subrugosa Thiele, 1916 accepted as Hemimarginula subrugosa (Thiele, 1916)
- Species Hemitoma tricarinata (Linnaeus, 1767) accepted as Amathina tricarinata (Linnaeus, 1767)
- Genus Legrandia C. E. Beddome, 1883 accepted as Zeidora A. Adams, 1860
- Genus Montfortia Récluz, 1843 (7)
- Genus Montfortista Iredale, 1929 (4)
- Genus Montfortulana Habe, 1961 (2)
- Genus Nesta H. Adams, 1870 accepted as Zeidora A. Adams, 1860
- Genus Octomarginula J. H. McLean, 2011 (6)
- Genus Profundisepta J. H. McLean & D. L. Geiger, 1998 (10)
- Genus Puncturella R. T. Lowe, 1827 (76)
- Genus Sipho T. Brown, 1827 accepted as Puncturella R. T. Lowe, 1827
- Genus Siphonella Issel, 1869 accepted as Montfortista Iredale, 1929
- Genus Subemarginula J. E. Gray, 1847 accepted as Hemitoma Swainson, 1840
- Genus Zeidora A. Adams, 1860 (23)
- Genus Zidora P. Fischer, 1885 accepted as Zeidora A. Adams, 1860
- Family Rimulidae Anton, 1838 accepted as Rimulinae Anton, 1838
- Family Zeidoridae Naef, 1913 accepted as Zeidorinae Naef, 1913
- Superfamily Haliotoidea Rafinesque, 1815 (94)
- Superfamily Lepetelloidea Dall, 1882 (104)
- Superfamily Lepetodriloidea J. H. McLean, 1988 (34)
- Superfamily Scissurelloidea J. E. Gray, 1847 (257)
- Order Neomphalida (63)
- Order Pleurotomariida (695)
- Order Seguenziida (923)
- Order Trochida (3 799)
- 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 (1 377)
- Class Polyplaxiphora accepted as Polyplacophora
- Class Rostroconchia † (64)
- Class Scaphopoda (752)
- Class Solenoconchia accepted as Scaphopoda
- Class Solenogastres (313)
- Subclass Chaetodermomorpha accepted as Caudofoveata