Phylum Mollusca Linnaeus, 1758 - molluscs
   Conchifera Gegenbaur, 1878 see Subphylum Conchifera Gegenbauer, 1878
     Cyrtosoma
       Class Gastropoda Cuvier, 1795 - snails and slugs
         Subclass †Divasibranchia Minichev & Starobogatov, 1975
           Order †Khairkhaniiformes Parkhaev, 2001
             Family †Khairkhaniidae Missarzhevsky, 1989
               1 Genus †Ardrossania Runnegar, 1990
               2 Genus †Barskovia Golubev, 1976
               3 Genus †Khairkhania Missarzhevsky, 1981
               4 Genus †Michniakia Rozanov & Missarzhevsky, 1966
               5 Genus †Philoxenella Vostokova, 1962
               6 Genus †Protowenella Runnegar & Jell, 1976
               7 Genus †Xinjispira Yü & Rong, 1987