Between brackets is the number of accepted species
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- Mollusca (133 296)
- Subphylum Aculifera
- Subphylum Conchifera
- Subphylum Placophora accepted as Polyplacophora
- Superclass Aplacophora
- Class Amphineura accepted as Aculifera
- Class Bivalvia (25 081)
- Class Caudofoveata (143)
- Class Cephalopoda (1 917)
- Class Conchifera accepted as Bivalvia
- Class Cricoconarida † (1)
- Class Gastropoda (103 041)
- Subclass Amphigastropoda † (434)
- Subclass Angiogastropoda represented as Gastropoda
- Subclass Apogastropoda
- Subclass Caenogastropoda (53 850)
- 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)
- Order Neomphalida (63)
- Order Pleurotomariida (698)
- Order Seguenziida (923)
- Order Trochida (3 802)
- Superfamily Angarioidea Gray, 1857 accepted as Trochoidea Rafinesque, 1815
- Superfamily Phasianelloidea Swainson, 1840 accepted as Trochoidea Rafinesque, 1815
- Superfamily Trochoidea Rafinesque, 1815 (3 802)
- Family Angariidae J. E. Gray, 1857 (59)
- Family Anomphalidae Wenz, 1938 † (16)
- Family Araeonematidae Nützel, 2012 † (10)
- Family Areneidae J. H. McLean, 2012 (56)
- Family Ataphridae Cossmann, 1915 † (16)
- Family Calliostomatidae Thiele, 1924 (1847) (618)
- Family Colloniidae Cossmann, 1917 (362)
- Family Conradiidae A. N. Golikov & Starobogatov, 1987 (109)
- Genus Conjectura H. J. Finlay, 1926 (3)
- Genus Conradia A. Adams, 1860 (33)
- Subgenus Conradia (Cithna) A. Adams, 1863 accepted as Cithna A. Adams, 1863
- Species Conradia (Cithna) globosa A. Adams, 1863 accepted as Cithna globosa (A. Adams, 1863)
- Species Conradia (Cithna) spirata A. Adams, 1863 accepted as Cithna spirata (A. Adams, 1863)
- Subgenus Conradia (Gottoina) A. Adams, 1863 accepted as Conradia A. Adams, 1860
- Species Conradia abyssa Rubio & Rolán, 2017
- Species Conradia cancellata Preston, 1916
- Species Conradia carinata Rubio & Rolán, 2020
- Species Conradia carinifera A. Adams, 1860
- Species Conradia cingulifera A. Adams, 1860
- Species Conradia clathrata A. Adams, 1860
- Species Conradia costriata Rubio & Rolán, 2020
- Species Conradia delicata Rubio & Rolán, 2020
- Species Conradia densa Rubio & Rolán, 2020
- Species Conradia depressa Rubio & Rolán, 2020
- Species Conradia discreta Rubio & Rolán, 2017
- Species Conradia dispersa Rubio & Rolán, 2020
- Species Conradia doliaris A. Adams, 1863
- Species Conradia edita Rubio & Rolán, 2020
- Species Conradia eutornisca (Melvill, 1918)
- Species Conradia faceta Rubio & Rolán, 2020
- Species Conradia microsculpta Rubio & Rolán, 2020
- Species Conradia minicostae Rubio & Rolán, 2020
- Species Conradia minor Rubio & Rolán, 2017
- Species Conradia minuta A. N. Golikov & Starobogatov, 1986 accepted as Fusitriton oregonensis (Redfield, 1846)
- Species Conradia muatsi L.-W. Lin & Rolán, 2024
- Species Conradia multicostae Rubio & Rolán, 2020
- Species Conradia museorum Rubio & Rolán, 2020
- Species Conradia paucicordata Rubio & Rolán, 2020
- Species Conradia perclathrata Sakurai, 1983
- Species Conradia perplexa Rubio & Rolán, 2020
- Species Conradia pluriapices Rubio & Rolán, 2020
- Species Conradia pulchella A. Adams, 1861
- Species Conradia pyrgula A. Adams, 1863
- Species Conradia sculpta Rubio & Rolán, 2020
- Species Conradia similiter Rubio & Rolán, 2020
- Species Conradia sulcifera A. Adams, 1863
- Species Conradia sursumnodosa Rubio & Rolán, 2020
- Species Conradia tornata A. Adams, 1863
- Species Conradia varia Rubio & Rolán, 2020
- Genus Crossea A. Adams, 1865 (20)
- Genus Crosseia P. Fischer, 1885 accepted as Crossea A. Adams, 1865
- Genus Crosseola Iredale, 1924 (49)
- Genus Crossolida Rubio & Rolán, 2019 (4)
- Family Crosseolidae Hickman, 2013 accepted as Conradiidae A. N. Golikov & Starobogatov, 1987
- Family Cyclostrematidae P. Fischer, 1885 accepted as Liotiidae Gray, 1850
- Family Delphinulidae Stoliczka, 1868 accepted as Angariidae J. E. Gray, 1857
- Family Elasmonematidae Knight, 1956 † (11)
- Family Epulotrochidae Gründel, Keupp & F. Lang, 2017 † (10)
- Family Eucochlidae Bandel, 2002 † (3)
- Family Fossarinidae Bandel, 2009 accepted as Fossarininae Bandel, 2009
- Family Gazidae Hickman & J. H. McLean, 1990 accepted as Margaritidae Thiele, 1924
- Family Liotiidae Gray, 1850 (154)
- Family Liotinidae Nomura, 1932 accepted as Liotiidae Gray, 1850
- Family Margaritidae Thiele, 1924 (76)
- Family Margaritinae Stoliczka, 1868 accepted as Margaritidae Thiele, 1924
- Family Metriomphalidae Gründel, Keupp & F. Lang, 2017 † (8)
- Family Microdomatidae Wenz, 1938 † (12)
- Family Nododelphinulidae L. R. Cox, 1960 † (17)
- Family Paleophasianellidae Chaix & Plicot, 2024 † (2)
- Family Phasianellidae Swainson, 1840 (84)
- Family Proconulidae L. R. Cox, 1960 † (10)
- Family Sclarotrardidae Gründel, Keupp & F. Lang, 2017 † (1)
- Family Skeneidae W. Clark, 1851 (440)
- Family Solariellidae A. W. B. Powell, 1951 (272)
- Family Stomatellidae J. E. Gray, 1840 accepted as Stomatellinae J. E. Gray, 1840
- Family Stomatiidae P. P. Carpenter, 1861 accepted as Stomatellinae J. E. Gray, 1840
- Family Talopiidae Finlay, 1928 accepted as Umboniinae H. Adams & A. Adams, 1854 (1840)
- Family Tegulidae Kuroda, Habe & Oyama, 1971 (120)
- Family Tricoliidae Woodring, 1928 accepted as Tricoliinae Woodring, 1928
- Family Trochidae Rafinesque, 1815 (1 045)
- Family Trochoidea incertae sedis (15)
- Family Turbinidae Rafinesque, 1815 (275)
- Family Tychobraheidae Horný, 1992 † (1)
- Family Velainellidae Vasseur, 1880 †
- Subfamily Minoliinae Kuroda, T. Habe & Oyama, 1971 accepted as Solariellidae A. W. B. Powell, 1951
- Subfamily Parataphrinae Calzada, 1989 † accepted as Proconulidae L. R. Cox, 1960 †
- 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 (754)
- Class Solenoconchia accepted as Scaphopoda
- Class Solenogastres (313)
- Subclass Chaetodermomorpha accepted as Caudofoveata
