Phylum Kinorhyncha Reinhard, 1887 - kinorhynchs
   Order Cyclorhagida Zelinka, 1896
     Suborder Cyclorhagae Zelinka, 1896
       1 Family Echinoderidae Bütschli, 1876
       2 Family Zelinkaderidae Higgins, 1990
       3 Family Centroderidae Zelinka, 1896
       4 Family Dracoderidae R.P. Higgins, in R.P. Higgins & Y. Shirayama, 1990