[Kingdom] Animalia Linnaeus, 1758 - animals
   Grade Enterozoa
     Grade Cœlomata
       Phylum Mollusca Linnaeus, 1758 - molluscs
         Branch Lipocephala
           Class Tentaculibranchia
             Branch Holobranchia
               Grade Ectoprocta
                 Order Phylactolæma
                   1 Genus Lophopus Dumortier, 1835
                   2 Genus Plumatella Lamarck, 1809