Phylum Mollusca Linnaeus, 1758 - molluscs
   Class Bivalvia Linnaeus, 1758 - bivalves
     Subclass Palaeoheterodonta Newell, 1965 see Clade Palaeoheterodonta Newell, 1965
       Order Trigonida orth. inval. [monotypic]
         Superfamily Trigonoidea orth. inval. [monotypic] see Superfamily Trigonioidea Lamarck, 1819
           Family Trigoniidae Lamarck, 1819 [monotypic]
             1 Genus Neotrigonia Cossmann, 1912 see Genus Trigonia Bruguière, 1789