Kingdom Animalia Linnaeus, 1758 - animals
   Phylum Nematoda Gegenbaur, 1859 - round worms
     Class Secernentea Von Linstow, 1905
       1 Subclass Rhabditia see Superorder Rhabditica Hodda, 2007
       2 Subclass Spiruria see Subclass Plectia Hodda, 2007
       3 Subclass Diplogasteria see Subclass Plectia Hodda, 2007