"Lower Heterobranchia" (basis of record)
Achatinidae Swainson, 1840 (basis of record)
Achatinina (basis of record)
Achatinini Swainson, 1840 (basis of record)
Achatinoidea Swainson, 1840 (basis of record)
Aclididae G. O. Sars, 1878 accepted as Eulimidae R. A. Philippi, 1853 (source of synonymy)
Acochlidiimorpha (basis of record)
Acochlidioidea Küthe, 1935 (basis of record)
Acteocinidae Dall, 1913 accepted as Tornatinidae P. Fischer, 1883 (source of synonymy)
Acteonidae A. d'Orbigny, 1842 (basis of record)
Acteonimorpha (basis of record)
Actinocyclidae O'Donoghue, 1929 (basis of record)
Adelomelonini Pilsbry & Olsson, 1954 (basis of record)
Aegiridae P. Fischer, 1883 (basis of record)
Aeolidioidea J. E. Gray, 1827 (basis of record)
Akeroidea Mazzarelli, 1891 (basis of record)
Amathinidae Ponder, 1987 (basis of record)
Amoriinae J. E. Gray, 1857 (basis of record)
Anabathridae Keen, 1971 (basis of record)
Anatominae J. H. McLean, 1989 accepted as Anatomidae J. H. McLean, 1989 (basis of record)
Angariidae J. E. Gray, 1857 (basis of record)
Aplysiida (basis of record)
Aplysioidea Lamarck, 1809 (basis of record)
Archaeogastropoda accepted as Vetigastropoda (status source)
Architaenioglossa (additional source)
Architectonicidae J. E. Gray, 1850 (basis of record)
Architectonicoidea J. E. Gray, 1850 (basis of record)
Areneidae J. H. McLean, 2012 (basis of record)
Arminoidea Iredale & O'Donoghue, 1923 (1841) (basis of record)
Ataphridae Cossmann, 1915 † (status source)
Athletinae Pilsbry & Olsson, 1954 (basis of record)
Atlantidae Rang, 1829 (basis of record)
Babyloniidae Kuroda, Habe & Oyama, 1971 (basis of record)
Belomitridae Kantor, Puillandre, Rivasseau & Bouchet, 2012 (status source)
Bistolidini C. P. Meyer, 2003 (status source)
Boselliidae Ev. Marcus, 1982 accepted as Plakobranchidae J. E. Gray, 1840 (source of synonymy)
Buccinoidea Rafinesque, 1815 (additional source)
Bulimulidae Tryon, 1867 (basis of record)
Bulinidae P. Fischer & Crosse, 1880 (basis of record)
Bullinidae Gray, 1850 accepted as Aplustridae J. E. Gray, 1847 (source of synonymy)
Bulloidea J. E. Gray, 1827 (basis of record)
Bursidae Thiele, 1925 (basis of record)
Busyconinae Wade, 1917 (1867) (status source)
Caecidae J. E. Gray, 1850 (basis of record)
Caliphyllidae Tiberi, 1881 (additional source)
Calliostomatidae Thiele, 1924 (1847) (basis of record)
Calliotectinae Pilsbry & Olsson, 1954 (basis of record)
Cancellariidae Forbes & Hanley, 1851 (status source)
Capulinae J. Fleming, 1822 (basis of record)
Cavoliniidae J. E. Gray, 1850 (1815) (basis of record)
Cerithiopsidae H. Adams & A. Adams, 1853 (basis of record)
Chilodontaidae "Wenz, 1938" [proposed to address assumed homonymy] accepted as Chilodontidae Wenz, 1938 (basis of record)
Chromodorididae Bergh, 1891 (basis of record)
Chromodoridinae Bergh, 1891 (basis of record)
Chromodoridoidea Bergh, 1891 (basis of record)
Cimidae Warén, 1993 (basis of record)
Cimoidea Warén, 1993 (basis of record)
Cladobranchia (status source)
Cliidae Jeffreys, 1869 (additional source)
Cocculinida (status source)
Cochlicellini Schileyko, 1972 (basis of record)
Colloniidae Cossmann, 1917 (basis of record)
Colubrariidae Dall, 1904 (status source)
Columbariidae Tomlin, 1928 (basis of record)
Columbellidae Swainson, 1840 (status source)
Conradiidae A. N. Golikov & Starobogatov, 1987 (basis of record)
Cornirostridae Ponder, 1990 (basis of record)
Creseidae Rampal, 1973 (basis of record)
Crosseolidae Hickman, 2013 accepted as Conradiidae A. N. Golikov & Starobogatov, 1987 (source of synonymy)
Curnonidae d'Udekem d'Acoz, 2017 (original description)
Cycloneritida (basis of record)
Cyclostrematidae P. Fischer, 1885 accepted as Liotiidae J. E. Gray, 1850 (source of synonymy)
Cymatiidae Iredale, 1913 (1854) (taxonomy source)
Cypraeoidea Rafinesque, 1815 (additional source)
Dendronotoidea Allman, 1845 (basis of record)
Diodorinae Odhner, 1932 accepted as Fissurellideinae Pilsbry, 1890 (basis of record)
Doridina accepted as Doridida (basis of record)
Ellobiida (basis of record)
Ellobiidae L. Pfeiffer, 1854 (1822) (basis of record)
Ellobioidea L. Pfeiffer, 1854 (1822) (basis of record)
Emarginulinae Children, 1834 (basis of record)
Eratoidae T. Gill, 1871 (status source)
Ergalataxinae Kuroda, T. Habe & Oyama, 1971 (basis of record)
Erosariinae Schilder, 1924 (basis of record)
Erroneinae F. A. Schilder, 1927 (status source)
Erroneini F. A. Schilder, 1927 (status source)
Eucyclidae Koken, 1896 (basis of record)
Euthecosomata (basis of record)
Euthyneura (basis of record)
Fasciolariidae Gray, 1853 (additional source)
Fautricinae B. A. Marshall, 1995 (additional source)
Favorininae Bergh, 1889 (basis of record)
Fissurellidae J. Fleming, 1822 (basis of record)
Fissurellideinae Pilsbry, 1890 (source of synonymy)
Fissurellinae J. Fleming, 1822 (basis of record)
Fissurelloidea J. Fleming, 1822 (basis of record)
Fluxinellini B. A. Marshall, 1991 (basis of record)
Fossarinae A. Adams, 1860 (basis of record)
Gabrieloninae Hickman & J. H. McLean, 1990 (basis of record)
Geomitridae C. R. Boettger, 1909 (basis of record)