Kingdom [Animalia] Linnaeus, 1758 - animals
   Subkingdom Metazoa Haeckel, 1874 see Kingdom Animalia Linnaeus, 1758
     Division Eumetazoa Butschli, 1910 see Subkingdom Eumetazoa Butschli, 1910
       Subdivision Bilateralia
         Phylum Asc-helminthes
           Class Nematoda Gegenbaur, 1859
             Subclass Adenophorea
               Order Desmoscolecida Filipjev, 1929
                 Genus Desmoscolex Claparède, 1863
                 Genus Greeffiella Cobb, 1922
                 Genus Tricoma Cobb, 1894