Mollusca Linnaeus, 1758 - molluscs see Phylum Mollusca Linnaeus, 1758
Count: 410f; †195f
   Gastropoda Cuvier, 1795 see Class Gastropoda Cuvier, 1795
  Count: [f†f] 410f; †172f
     Clade Heterobranchia Burmeister, 1837 see Superorder Heterobranchia Burmeister, 1837
    Count: [f†f] 238f; †29f
       Informal Group "Lower Heterobranchia"
      Count: [f†f] 19f; †21f
         01 Family Cimidae Warén, 1993
        Count: -
         02 Family †Dolomitellidae Bandel, 1994
        Count: -
         03 Family †Heterosubulitidae Bandel, 2002
        Count: -
         04 Family †Kuskokwimiidae Frýda & Blodgett, 2001
        Count: -
         05 Family †Misurinellidae Bandel, 1994
        Count: -
         06 Family Orbitestellidae Iredale, 1917
        Count: -
         07 Family Tjaernoeiidae Warén, 1991
        Count: -
         08 Family Xylodisculidae Warén, 1992
        Count: -
         09 Superfamily Acteonoidea d'Orbigny, 1843
        Count: -
         10 Superfamily Architectonicoidea Gray, 1850
        Count: [f†f] 1f; †2f
         11 Superfamily Glacidorboidea Ponder, 1986
        Count: -
         12 Superfamily Mathildoidea Dall, 1889
        Count: [f†f] 1f; †5f
         13 Superfamily †Nerineoidea Zittel, 1873
        Count: [†f] †3f
         14 Superfamily Omalogyroidea Sars, 1878
        Count: [f†f] 1f; †1f
         15 Superfamily Pyramidelloidea Gray, 1840
        Count: [f†f] 3f; †1f
         16 Superfamily Ringiculoidea Philippi, 1853
        Count: [f] 1f
         17 Superfamily Rissoelloidea Gray, 1850
        Count: [f] 1f
         18 Superfamily †Streptacidoidea Knight, 1931
        Count: [†f] †2f
         19 Superfamily Valvatoidea Gray, 1840
        Count: [f†f] 3f; †1f