Phylum Tardigrada Doyère, 1840 - tardigrades
   Order Heterotardigrada Marcus, 1927 see Class Heterotardigrada Marcus, 1927
     Suborder Arthrotardigrada Marcus, 1927 see Order Arthrotardigrada Marcus, 1927
       Family Halechiniscidae Thulin, 1928
         Subfamily Tanarctinae Renaud-Mornant, 1980