Kingdom Animalia Linnaeus, 1758 - animals
   Phylum Cephalorhyncha Malakhov, 1980
     1 Class Priapulida Théel, 1906 see Phylum Priapulida Delage & Hérouard, 1897
     2 Class Kinorhyncha Reinhard, 1887 see Phylum Kinorhyncha Reinhard, 1887
     3 Class Loricifera (Kristensen, 1983) see Phylum Loricifera Kristensen, 1983
     4 Class Nematomorpha Vejdovsky, 1886 see Phylum Nematomorpha Vejdovsky, 1886