Abyssochrysidae Tomlin, 1927 (basis of record)
Abyssochrysoidea Tomlin, 1927 (basis of record)
Acanthonematidae Wenz, 1938 † (basis of record)
Aclididae G. O. Sars, 1878 accepted as Eulimidae R. A. Philippi, 1853 (basis of record)
Acmaeidae Forbes, 1850 (basis of record)
Acochlidiidae Küthe, 1935 (basis of record)
Acroloxidae Thiele, 1931 (basis of record)
Acroreiidae Cossmann, 1893 † (basis of record)
Acteoninidae Cossmann, 1895 † (basis of record)
Acteoninoidea Cossmann, 1895 † (basis of record)
Acteonoidea A. d'Orbigny, 1842 (basis of record)
Addisoniidae Dall, 1882 (basis of record)
Addisoniinae Dall, 1882 (basis of record)
Adelacerithiinae B. A. Marshall, 1984 (basis of record)
Admetinae Troschel, 1865 (status source)
Aeolidiidae Gray, 1827 (basis of record)
Akeridae Mazzarelli, 1891 (additional source)
Aliptinae B. A. Marshall, 1978 represented as Cerithiopsidae H. Adams & A. Adams, 1853 (basis of record)
Amphibolidae Gray, 1840 (basis of record)
Amphiboloidea Gray, 1840 (basis of record)
Ampullarioidea Gray, 1824 (basis of record)
Ampullinidae Cossmann, 1919 (basis of record)
Anadromidae Wenz, 1940 † (basis of record)
Anatomidae J. H. McLean, 1989 (basis of record)
Anculinae Pruvot-Fol, 1954 (basis of record)
Ancylus (Ancylastrum) Bourguignat, 1853 accepted as Ancylastrum Bourguignat, 1853 (status source)
Aneiteinae Gray, 1860 represented as Athoracophoridae P. Fischer, 1883 (1860) (basis of record)
Annulariidae J. B. Henderson & Bartsch, 1920 (basis of record)
Anostomopsidae H. Nordsieck, 1986 † (basis of record)
Anozygidae Bandel, 2002 † (basis of record)
Anthracopupidae Wenz, 1938 † (basis of record)
Aplustridae Gray, 1847 (basis of record)
Aplysiidae Lamarck, 1809 (additional source)
Aplysiinae Lamarck, 1809 represented as Aplysiidae Lamarck, 1809 (basis of record)
Aporrhaidae J. E. Gray, 1850 (additional source)
Archaeopragidae Horný, 1963 † (basis of record)
Archinacellidae Knight, 1952 † (basis of record)
Archinacelloidea Knight, 1952 † (basis of record)
Architectibranchia represented as [unassigned] Heterobranchia (basis of record)
Arminidae Iredale & O'Donoghue, 1923 (1841) (basis of record)
Asperspinidae Rankin, 1979 (basis of record)
Assimineidae H. Adams & A. Adams, 1856 (basis of record)
Ataxocerithiinae Ludbrook, 1957 accepted as Newtoniellidae Korobkov, 1955 (basis of record)
Athoracophoridae P. Fischer, 1883 (1860) (basis of record)
Athoracophorinae P. Fischer, 1883 (1860) (basis of record)
Atydinae Thiele, 1925 represented as Haminoeidae Pilsbry, 1895 (basis of record)
Austrocypraeini Iredale, 1935 (basis of record)
Babakinidae Roller, 1973 (basis of record)
Barleeiidae J. E. Gray, 1857 (basis of record)
Bathydorididae Bergh, 1891 (additional source)
Bathydoridoidea Bergh, 1891 (basis of record)
Bathyphytophilidae Moskalev, 1978 (basis of record)
Bellerophontidae McCoy, 1852 † (basis of record)
Bellerophontoidea F. McCoy, 1852 † (basis of record)
Bertheliniinae Keen & A. G. Smith, 1961 (basis of record)
Bistolidini C. P. Meyer, 2003 (basis of record)
Bithyniidae Gray, 1857 (basis of record)
Bohaispiridae B.-Y. Huang, 1983 † (basis of record)
Bornellidae Bergh, 1874 (basis of record)
Bullidae Gray, 1827 (source of synonymy)
Cadlinidae Bergh, 1891 (basis of record)
Caecinae J. E. Gray, 1850 (basis of record)
Caenogastropoda (basis of record)
Calliostomatinae Thiele, 1924 (1847) (basis of record)
Calmidae Iredale & O'Donoghue, 1923 (basis of record)
Calopiidae Ponder, 1999 (additional source)
Calyptraeidae Lamarck, 1809 (basis of record)
Calyptraeoidea Lamarck, 1809 (basis of record)
Campanilidae Douvillé, 1904 (basis of record)
Campaniloidea (basis of record)
Campaniloidea (taxonomy source)
Cancellariinae Forbes & Hanley, 1851 (basis of record)
Canterburyellidae Bandel, Gründel & P. A. Maxwell, 2000 † (basis of record)
Capulidae J. Fleming, 1822 (additional source)
Carinariidae Blainville, 1818 (additional source)
Carychiinae Jeffreys, 1830 (basis of record)
Cassidae Latreille, 1825 (basis of record)
Catantostomatidae Wenz, 1938 † (basis of record)
Catinellinae Odhner, 1950 (basis of record)
Cavolinioidea J. E. Gray, 1850 (1815) (basis of record)
Cephalaspidea (basis of record)
Ceritellidae Wenz, 1938 † (basis of record)
Cerithiidae J. Fleming, 1822 (basis of record)
Cerithiinae J. Fleming, 1822 (basis of record)
Cerithioidea J. Fleming, 1822 (additional source)
Cerithiopsinae H. Adams & A. Adams, 1853 represented as Cerithiopsidae H. Adams & A. Adams, 1853 (basis of record)
Chilinidae Dall, 1870 (basis of record)
Chondrinidae Steenberg, 1925 (basis of record)
Chrysallidini Saurin, 1958 (basis of record)
Cingulinini Saurin, 1958 represented as Turbonillinae Bronn, 1849 (basis of record)
Cingulopsidae Fretter & Patil, 1958 (additional source)
Cingulopsoidea Fretter & Patil, 1958 (basis of record)
Cirridae Cossmann, 1916 † (basis of record)
Clathurellidae H. Adams & A. Adams, 1858 (additional source)
Clausiliidae J. E. Gray, 1855 (basis of record)
Clavatulidae Gray, 1853 (basis of record)
Cleopatrinae Pilsbry & Bequaert, 1927 (basis of record)
Clionidae Rafinesque, 1815 (basis of record)
Clioninae Rafinesque, 1815 represented as Clionidae Rafinesque, 1815 (basis of record)
Clionoidea Rafinesque, 1815 (basis of record)