[Kingdom] Animalia Linnaeus, 1758 - animals
   Grade Enterozoa
     Grade Cœlomata
       Phylum Nematoidea
         [Class] Nematoidea Rudolphi, 1808 see Phylum Nematoda Gegenbaur, 1859
           [Family] Trichinidæ nom. illeg.
             1 Genus Trichocephalus Schrank, 1788
             2 Genus Trichina Owen, 1835, nom. illeg.