Phylum Tardigrada Doyère, 1840 - tardigrades
   Class Eutardigrada Richters, 1926 - naked tardigrades
     Order Parachela Schuster, Nelson, Grigarick & Christenberry, 1980
       Family Hypsibiidae Pilato, 1969
         1 Genus Hypsibius Ehrenberg, 1848
         2 Genus Isohypsibius Thulin, 1928
         3 Genus Thulinius R. Bertolani, 2003
         4 Genus Astatumen Pilato, 1997
         5 Genus Itaquascon de Barros, 1939
         6 Genus Diphascon Plate, 1888
         7 Genus Hebesuncus Pilato, 1987
         8 Genus Platicrista Pilato, 1987
         9 Genus Ramazzottius Binda & Pilato, 1986