Kingdom Animalia Linnaeus, 1758 - animals
   Phylum Nematoda Gegenbaur, 1859 - round worms
     Class Chromadorea Inglis, 1983
       Subclass Plectia Hodda, 2007
         Superorder Monhysterica Hodda, 2007 [monotypic]
           Order Monhysterida Filipjev, 1929
             Suborder Linhomoeina Andrassy, 1974 [monotypic]
               Superfamily Siphonolaimoidea Chitwood, 1937
                 1 Family Fusivermidae Tchesunov, 1996
                 2 Family Linhomoeidae Filipjev, 1922
                 3 Family Siphonolaimidae Chitwood, 1937