Phylum [Mollusca] Linnaeus, 1758 - molluscs
   Class Bivalvia Linnaeus, 1758 - bivalves
     Order Myoida Stoliczka, 1870 see Order Myida Stoliczka, 1870
       Superfamily Pholadacea Lamarck, 1809, nom. illeg. see Superfamily Pholadoidea Lamarck, 1809
         Family Pholadidae Lamarck, 1809 - piddocks
           Subfamily Pholadinae Lamarck, 1809
             Genus Monothyra Tryon, 1862 see Subgenus Monothyra Tryon, 1862