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 Palaeotaxodonta Korobkov, 1954 see Subclass Protobranchia Pelseneer, 1889
           Genus Yoldia Møller, 1842
             Subgenus Megayoldia Verrill & Bush, 1897 see Genus Megayoldia Verrill & Bush, 1897