Kingdom Animalia Linnaeus, 1758 - animals
   Phylum Nematoda Gegenbaur, 1859 - round worms
     Class Chromadorea Inglis, 1983
       Subclass Plectia Hodda, 2007
         Superorder Rhabditica Hodda, 2007
           Order Panagrolaimida Hodda, 2007
             Suborder Cephalobina Andrassy, 1974 [monotypic]
               Superfamily Cephaloboidea Filipjev, 1934
                 1 Family Alirhabditidae Suryawanshi, 1971
                 2 Family Bicirronematidae Andrassy, 1978
                 3 Family Cephalobidae Filipjev, 1934
                 4 Family Elaphonematidae Heyns, 1962
                 5 Family Metacrobelidae Paramonov, 1964
                 6 Family Osstellidae Heyns, 1962