Kingdom Animalia Linnaeus, 1758 - animals
   Phylum Nematoda Gegenbaur, 1859 - round worms
     Class Dorylaimea Hodda, 2007
       Subclass Bathyodontia Hodda, 2007 [monotypic]
         Superorder Mononchica Hodda, 2007
           Order Mermithida Hyman, 1951
             Suborder Aulolaimina Hodda, 2007
               1 Superfamily Aulolaimoidea Jairajpuri & Hooper, 1968 [monotypic]
               2 Superfamily Isolaimioidea Timm, 1969 [monotypic]