Kingdom Animalia Linnaeus, 1758 - animals
Ref: Z.-Q. Zhang, 2011: 9
   Phylum Nematoda Gegenbaur, 1859 - round worms
  Ref: M. Hodda, 2011: 63; 10
     Class Chromadorea Inglis, 1983
    Ref: M. Hodda, 2011: 70
       Subclass Plectia Hodda, 2007
      Ref: M. Hodda, 2011: 71
         Superorder Rhabditica Hodda, 2007
        Ref: M. Hodda, 2011: 73
           Order Drilonematida Hodda, 2011 [monotypic]
          Ref: M. Hodda, 2011: 74 [new rank]
             Suborder Drilonematina Hodda, 2011 [monotypic]
            Ref: M. Hodda, 2011: 74 [new rank]
               Superfamily Drilonematoidea Pierantoni, 1916
              Ref: M. Hodda, 2011: 74 [new position]
                 1 Family Creagrocercidae Baylis, 1943
                Ref: M. Hodda, 2011: 74
                 2 Family Drilonematidae Pierantoni, 1916
                Ref: M. Hodda, 2011: 74
                 3 Family Homungellidae Timm, 1966
                Ref: M. Hodda, 2011: 74
                 4 Family Mesidionematidae Poinar, 1978
                Ref: M. Hodda, 2011: 74
                 5 Family Pharyngonematidae Chitwood, 1950
                Ref: M. Hodda, 2011: 74
                 6 Family Scolecophilidae Baylis, 1943
                Ref: M. Hodda, 2011: 74
                 7 Family Ungellidae Chitwood, 1950
                Ref: M. Hodda, 2011: 74