Kingdom Animalia Linnaeus, 1758 - animals
   Phylum Nematoda Gegenbaur, 1859 - round worms
     Class Chromadorea Inglis, 1983
       Subclass Plectia Hodda, 2007
         Superorder Plectica Hodda, 2007
           Order Leptolaimida Hodda, 2007 [monotypic]
             Suborder Leptolaimina Lorenzen, 1981
               1 Superfamily Ceramonematoidea Cobb, 1933
               2 Superfamily Leptolaimoidea Oerley, 1880