Phylum Tardigrada Doyère, 1840 - tardigrades
   Class Eutardigrada Richters, 1926 - naked tardigrades
     Order Parachela Schuster, Nelson, Grigarick & Christenberry, 1980
       Family Calohypsibiidae Pilato, 1969
         1 Genus Calohypsibius Thulin, 1928
         2 Genus Haplohexapodibius Pilato & Beasley, 1987
         3 Genus Haplomacrobiotus May, 1948
         4 Genus Hexapodibius Pilato, 1969
         5 Genus Parhexapodibius Pilato, 1969