Phylum Mollusca Linnaeus, 1758 - molluscs
   Conchifera Gegenbaur, 1878 see Subphylum Conchifera Gegenbauer, 1878
     Cyrtosoma
       Class Gastropoda Cuvier, 1795 - snails and slugs
         Subclass †Dextrobranchia Minichev & Starobogatov, 1979
           Order †Onychochiliformes Starobogatov, 1984
             Family †Onychochilidae Koken, 1925
               1 Genus †Beshtashella Missarzhevskij, 1981
               1.0 [Genus †Kistasella Missarjevsky, 1989] see Genus Beshtashella Missarzhevskij, 1981
               1.0 [Genus †Yuwenia Runnegar, 1981] see Genus Beshtashella Missarzhevskij, 1981