Superphylum Panarthropoda Nielsen, 1995 see [unranked] Panarthropoda Nielsen, 1995
   Tactopoda Budd, 2001
     Phylum Tardigrada Doyère, 1840 - tardigrades
       1 †Onychodictyon ferox Hou, Ramsköld & Bergström, 1991
       2.1 Actinarctus doryphorus Schulz, 1935
       2.2.1 Halobiotus arcturulius Crisp & R.M. Kristensen, 1983
       2.2.2 †Siberian Orsten Tardigrade