Kingdom Animalia Linnaeus, 1758 - animals
   Phylum Tardigrada Doyère, 1840 - tardigrades
     Class Heterotardigrada Marcus, 1927 - armored tardigrades
       Order Arthrotardigrada Marcus, 1927 - arthrotardigrades
         1 Family Archechiniscidae Binda, 1978
         2 Family Batillipedidae Ramazzotti, 1962
         3 Family Coronarctidae Renaud-Mornant, 1974
         4 Family Halechiniscidae Thulin, 1928
         5 Family Neoarctidae de Zio Grimaldi, D'Addabbo Gallo & Morone De Lucia, 1992
         6 Family Neostygarctidae Grimaldi de Zio, D'Addabbo Gallo & Morone De Lucia, 1987
         7 Family Renaudarctidae Kristensen & Higgins, 1984
         8 Family Stygarctidae Schulz, 1951