Phylum Mollusca Linnaeus, 1758 - molluscs
   Conchifera Gegenbaur, 1878 see Subphylum Conchifera Gegenbauer, 1878
     Cyrtosoma
       Class Gastropoda Cuvier, 1795 - snails and slugs
         Subclass †Archaeobranchia Parkhaev, 2001
           Order †Helcionelliformes Golikov & Starobogatov, 1975
             Superfamily †Helcionelloidea Wenz, 1938 see Superfamily Scenelloidea Miller, 1889
               Family †Coreospiridae Knight, 1947
                 1 Genus †Cambrospira Yu Wen, 1979
                 2 Genus †Coreospira Saito, 1936
                 3 Genus †Kutanjia Kruse, 1991
                 4 Genus †Latouchella Cobbold, 1921
                 5 Genus †Pseudoyangtzespira Bokova, 1990
                 6 Genus †Tichkaella Geyer, 1986