Kingdom Animalia Linnaeus, 1758 - animals
   Phylum Mollusca Linnaeus, 1758 - molluscs
     Subphylum Diasoma Runnegar & Pojeta Jr., 1974 see Phylum Mollusca Linnaeus, 1758
       Class Pelecypoda Goldfuss, 1820 see Class Bivalvia Linnaeus, 1758
         Subclass Isofilibranchia Iredale, 1939 see Superorder Isofilibranchia Iredale, 1939
           Genus †Fordilla Barrande, 1881
             †Fordilla sibirica Krasilova, 1977
             †Fordilla troyensis Barrande