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)
Acroloxoidea Thiele, 1931 accepted as Lymnaeoidea Rafinesque, 1815 (basis of record)
Acteonoidea A. d'Orbigny, 1842 (basis of record)
Addisoniidae Dall, 1882 (basis of record)
Addisoniinae Dall, 1882 (basis of record)
Adeorbidae Monterosato, 1884 accepted as Tornidae Sacco, 1896 (1884) (basis of record)
Admetinae Troschel, 1865 (status source)
Aegiretidae P. Fischer, 1883 accepted as Aegiridae P. Fischer, 1883 (additional source)
Aeolidida accepted as Aeolidioidea Gray, 1827 (basis of record)
Aeolidiidae Gray, 1827 (basis of record)
Akeridae Mazzarelli, 1891 (additional source)
Ampullinidae Cossmann, 1919 (basis of record)
Ampullospiridae L. R. Cox, 1930 † accepted as Ampullinidae Cossmann, 1919 (source of synonymy)
Anatomidae J. H. McLean, 1989 (basis of record)
Anculinae Pruvot-Fol, 1954 (basis of record)
Aplustridae Gray, 1847 (basis of record)
Aplysiidae Lamarck, 1809 (additional source)
Aplysiomorpha accepted as Aplysiida (additional source)
Aporrhaidae J. E. Gray, 1850 (additional source)
Archidorididae Bergh, 1891 accepted as Dorididae Rafinesque, 1815 (additional source)
Architectibranchia represented as Heterobranchia incertae sedis (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)
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)
Bistolidini C. P. Meyer, 2003 (basis of record)
Bithyniidae J. E. Gray, 1857 (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)
Calliostomatini Thiele, 1924 (1847) accepted as Calliostomatinae Thiele, 1924 (1847) (basis of record)
Calmidae Iredale & O'Donoghue, 1923 (basis of record)
Calyptraeidae Lamarck, 1809 (basis of record)
Calyptraeoidea Lamarck, 1809 (basis of record)
Campaniloidea (taxonomy source)
Campaniloidea (basis of record)
Cancellariinae Forbes & Hanley, 1851 (basis of record)
Cancellarioidea Forbes & Hanley, 1851 accepted as Volutoidea Rafinesque, 1815 (additional source)
Capulidae J. Fleming, 1822 (additional source)
Carinariidae Blainville, 1818 (additional source)
Carychiinae Jeffreys, 1830 (basis of record)
Cassidae Latreille, 1825 (basis of record)
Cassoidea accepted as Tonnoidea Suter, 1913 (1825) (basis of record)
Cavolinioidea J. E. Gray, 1850 (1815) (basis of record)
Cephalaspidea (basis of record)
Cerithiidae J. Fleming, 1822 (basis of record)
Cerithiinae J. Fleming, 1822 (basis of record)
Cerithioidea J. Fleming, 1822 (additional source)
Cerithiopsoidea accepted as Triphoroidea J. E. Gray, 1847 (basis of record)
Chilodontidae Wenz, 1938 accepted as Chilodontaidae Wenz, 1938 (additional source)
Choristellinae Bouchet & Warén, 1979 accepted as Choristellidae Bouchet & Warén, 1979 (basis of record)
Chrysallidini Saurin, 1958 (basis of record)
Cingulopsidae Fretter & Patil, 1958 (additional source)
Cingulopsoidea Fretter & Patil, 1958 (basis of record)
Clathurellidae H. Adams & A. Adams, 1858 (additional source)
Clavatulidae J. E. Gray, 1853 (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)
Cliopsidae O. G. Costa, 1873 (basis of record)
Cocculinidae Dall, 1882 (basis of record)
Cocculinoidea Dall, 1882 (basis of record)
Cochlespiridae A. W. B. Powell, 1942 (basis of record)
Cochliopidae Tryon, 1866 (basis of record)
Conidae J. Fleming, 1822 (basis of record)
Conoidea J. Fleming, 1822 (basis of record)
Coralliophilidae Chenu, 1859 accepted as Coralliophilinae Chenu, 1859 (source of synonymy)
Coralliophilinae Chenu, 1859 (basis of record)
Corambidae Bergh, 1871 (basis of record)
Coryphellidae Bergh, 1889 (basis of record)
Crepidulidae J. Fleming, 1822 accepted as Calyptraeidae Lamarck, 1809 (source of synonymy)
Crepiduloidea J. Fleming, 1822 accepted as Calyptraeoidea Lamarck, 1809 (additional source)
Ctiloceratinae Iredale & Laseron, 1957 (basis of record)
Cumanotidae Odhner, 1907 (basis of record)
Cuthonidae Odhner, 1934 (basis of record)
Cyclophoroidea J. E. Gray, 1847 (basis of record)
Cylichnidae H. Adams & A. Adams, 1854 (basis of record)
Cylindrobullidae Thiele, 1931 (basis of record)
Cylindrobulloidea Thiele, 1931 accepted as Oxynooidea Stoliczka, 1868 (1847) (basis of record)
Cymatiinae Iredale, 1913 (1854) accepted as Cymatiidae Iredale, 1913 (additional source)
Cymbiinae H. Adams & A. Adams, 1853 (1847) (additional source)
Cymbuliidae Gray, 1840 (basis of record)
Cymbuliinae Gray, 1840 (basis of record)
Cymbulioidea Gray, 1840 (basis of record)
Cypraeidae Rafinesque, 1815 (basis of record)
Cypraeinae Rafinesque, 1815 (basis of record)
Cypraeini Rafinesque, 1815 (basis of record)
Dendrodorididae O'Donoghue, 1924 (1864) (basis of record)
Desmopteridae Chun, 1889 (basis of record)
Dialidae Kay, 1979 (basis of record)
Diaphanidae Odhner, 1914 (1857) (basis of record)

 Classification

 for Cocculinida

Established as suborder containing the superfamilies Cocculinoidea and Lepetelloidea by Haszprunar (1987). ... [details]

 Classification

 for Neolepetopsidae J. H. McLean, 1990

The distinctiveness of the radula, which seems to have been the main reason for a superfamily level for this group ... [details]

 Classification

 for Neolepetopsoidea J. H. McLean, 1990

The distinctiveness of the radula, which seems to have been the main reason for a superfamily level for this group ... [details]

 Classification

 for Vermetidae Rafinesque, 1815

The position of the Vermetidae has been controversial. However, sperm ultrastructure (Healy, 1988) and molecular ... [details]

 Nomenclature

 for Runcinacea

Originally introduced by Colosi (1915) as Runcinidea, a "section" [above family level] of Tectibranchia containing ... [details]

 Spelling

 for Acochlidiimorpha

Spelling emended to (order) Acochlidioidea by Rankin (1979: 83); to Acochlidiomorpha by Salvini-Plawen (1983: 309); ... [details]