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 Tylenchina Chitwood, 1950
               1 Superfamily Anguinoidea Nicoll, 1935 (1926)
               2 Superfamily Criconematoidea Taylor, 1936 (1914)
               3 Superfamily Sphaerularioidea Lubbock, 1861
               4 Superfamily Tylenchoidea Örley, 1880