[Kingdom] Animalia Linnaeus, 1758 - animals
   Grade Enterozoa
     Grade Cœlomata
       Phylum Nematoidea
         [Class] Nematoidea Rudolphi, 1808 see Phylum Nematoda Gegenbaur, 1859
           [Family] Anguillulidæ
             1 Genus Tylenchus Bastian, 1865
             2 Genus Rhabditis Dujardin, 1845