Kingdom Animalia Linnaeus, 1758 - animals
   Phylum Nematoda Gegenbaur, 1859 - round worms
     Class Chromadorea Inglis, 1983
       Subclass Plectia Hodda, 2007
         Superorder Rhabditica Hodda, 2007
           Order Diplogasterida Inglis, 1983 see Order Diplogastrida Inglis, 1983
             Suborder Diplogasterina Paramonov, 1952 see Suborder Diplogastrina Paramonov, 1952
               Superfamily Diplogasteroidea Micoletzky, 1922 see Superfamily Diplogastroidea Micoletzky, 1922
                 1 Family Cephalobiidae Travassos & Kloss, 1960
                 2 Family Diplogasteridae Micoletzky, 1922 see Family Diplogastridae Micoletzky, 1922
                 3 Family Diplogasteroididae Filipjev & Schuurmans Stekhoven, 1941
                 4 Family Neodiplogasteridae Paramonov, 1952 see Family Neodiplogastridae Paramonov, 1952
                 5 Family Pseudodiplogasteroididae Körner, 1954
                 6 Family Tylopharyngidae Filipjev, 1934