Phylum Tardigrada Doyère, 1840 - tardigrades
   Class Eutardigrada Richters, 1926 - naked tardigrades
     Order Parachela Schuster, Nelson, Grigarick & Christenberry, 1980
       1 Family Macrobiotidae Thulin, 1928
       2 Family Calohypsibiidae Pilato, 1969
       3 Family Hypsibiidae Pilato, 1969