Abyssochrysidae Tomlin, 1927 (basis of record)
Abyssochrysoidea Tomlin, 1927 (basis of record)
Acanthonematidae Wenz, 1938 † (basis of record)
Acleioprocta accepted as Fionoidea Gray, 1857 (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)
Acroloxoidea Thiele, 1931 accepted as Lymnaeoidea Rafinesque, 1815 (basis of record)
Acroreiidae Cossmann, 1893 † (basis of record)
Actaeonidae Allman, 1845 accepted as Plakobranchidae Gray, 1840 (source of synonymy)
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)
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)
Aeolidiacea accepted as Aeolidioidea Gray, 1827 (basis of record)
Aeolidida accepted as Aeolidioidea Gray, 1827 (basis of record)
Aeolidiidae Gray, 1827 (basis of record)
Akeridae Mazzarelli, 1891 (additional source)
Aldanellidae Linsley & Kier, 1984 † (basis of record)
Alderiidae Pruvot-Fol, 1954 accepted as Limapontiidae Gray, 1847 (source of synonymy)
Aliptinae B. A. Marshall, 1978 represented as Cerithiopsidae H. Adams & A. Adams, 1853 (basis of record)
Amberleyoidea Wenz, 1938 † accepted as Eucyclidae Koken, 1896 (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)
Ampullospiridae L. R. Cox, 1930 † accepted as Ampullinidae Cossmann, 1919 (source of synonymy)
Anadromidae Wenz, 1940 † (basis of record)
Anaplocamidae Dall, 1921 accepted as Pleuroceridae P. Fischer, 1885 (1863) (source of synonymy)
Anatomidae J. H. McLean, 1989 (basis of record)
Ancillariinae Swainson, 1840 accepted as Ancillariidae Swainson, 1840 (basis of record)
Anculinae Pruvot-Fol, 1954 (basis of record)
Ancylidae Rafinesque, 1815 accepted as Ancylinae Rafinesque, 1815 (status source)
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)
Anopsiidae Pruvot-Fol, 1922 accepted as Hydromylidae Pruvot-Fol, 1942 (1862) (basis of record)
Anostomopsidae H. Nordsieck, 1986 † (basis of record)
Anozygidae Bandel, 2002 † (basis of record)
Anthracopupidae Wenz, 1938 † (basis of record)
Aplodontidae Kuroda, 1933 accepted as Modulidae P. Fischer, 1884 (source of synonymy)
Aplustridae Gray, 1847 (basis of record)
Aplysiidae Lamarck, 1809 (additional source)
Aplysiinae Lamarck, 1809 represented as Aplysiidae Lamarck, 1809 (basis of record)
Aplysiomorpha accepted as Aplysiida (additional source)
Aporrhaidae J. E. Gray, 1850 (additional source)
Aporrhaiidae accepted as Aporrhaidae J. E. Gray, 1850 (additional source)
Aquillidae Pilsbry, 1904 accepted as Cymatiidae Iredale, 1913 (source of synonymy)
Archaeopragidae Horný, 1963 † (basis of record)
Archidorididae Bergh, 1891 accepted as Dorididae Rafinesque, 1815 (additional source)
Archimediellidae Starobogatov, 1982 accepted as Turritellidae Lovén, 1847 (source of synonymy)
Archinacellidae Knight, 1952 † (basis of record)
Archinacelloidea Knight, 1952 † (basis of record)
Architectibranchia represented as Heterobranchia incertae sedis (basis of record)
Argobuccininae Kilias, 1973 (basis of record)
Argyropezinae Bandel, 2006 † accepted as Bittiinae Cossmann, 1906 (basis of record)
Arminidae Iredale & O'Donoghue, 1923 (1841) (basis of record)
Arthessidae C. R. Boettger, 1963 accepted as Volvatellidae Pilsbry, 1895 (source of synonymy)
Ascobullidae Habe, Okutani & Nishiwaki, 1994 accepted as Volvatellidae Pilsbry, 1895 (source of synonymy)
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)
Atthilidae Bergh, 1899 accepted as Heterodorididae A. E. Verrill & Emerton, 1882 (basis of record)
Atydidae Thiele, 1925 accepted as Atydinae Thiele, 1925 represented as Haminoeidae Pilsbry, 1895 (additional source)
Atydinae Thiele, 1925 represented as Haminoeidae Pilsbry, 1895 (basis of record)
Austrocypraeini Iredale, 1935 (basis of record)
Babainidae Roller, 1972 accepted as Babakinidae Roller, 1973 (basis of record)
Babakinidae Roller, 1973 (basis of record)
Bankiviini Hickman & J. H. McLean, 1990 accepted as Umboniinae H. Adams & A. Adams, 1854 (1840) (basis of record)
Barleeiidae J. E. Gray, 1857 (basis of record)
Bathanaliidae Ancey, 1906 accepted as Hauttecoeuriinae Bourguignat, 1885 (source of synonymy)
Bathyberthellini F. J. García, Troncoso, Cervera & García-Gómez, 1996 accepted as Pleurobranchidae Gray, 1827 (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)
Bembiciidae H. J. Finlay, 1928 accepted as Lacuninae Gray, 1857 (source of synonymy)
Bertheliniinae Keen & A. G. Smith, 1961 (basis of record)
Bistolidini C. P. Meyer, 2003 (basis of record)
Bithyniidae J. E. Gray, 1857 (basis of record)
Bohaispiridae B.-Y. Huang, 1983 † (basis of record)
Bornellidae Bergh, 1874 (basis of record)
Brotiinae A. N. Golikov & Starobogatov, 1987 accepted as Pachychilidae P. Fischer & Crosse, 1892 (source of synonymy)
Bucanellidae Koken, 1925 † (basis of record)
Bucaniidae Ulrich & Scofield, 1897 † (basis of record)
Bullactidae Thiele, 1926 accepted as Haminoeidae Pilsbry, 1895 (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)

Vietnam for Bertia setzeri Thach, 2015 

 Classification

 for Cocculinida

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

 Classification

 for Euarminida

Wägele & Willan (2000) concluded that the Arminoida as classically understood (containing Arminidae, ... [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 Chlamydephorus W. G. Binney, 1879

Chlamydephorus H.O. Lenz, 1831 was suggested as a grammatically more correct name for Chlamyphorus Harlan, 1825 ... [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]

 Spelling

 for Plakobranchidae Gray, 1840

Original spelling Placobranchidae, based on Placobranchus, an incorrect subsequent spelling by Férussac (1824) in ... [details]

 Taxonomy

 for Thalassocyon Barnard, 1960

Riedel (1995) elevated this genus to a family level (Thalassocyonidae), a vision not supported in Verhaeghe & Poppe ... [details]