Order Arthrotardigrada Marcus, 1927 - arthrotardigrades
Count: 1f;1g;4s
   Family Stygarctidae Schulz, 1951
  Count: 1g;4s
     Genus Megastygarctides McKirdy et al., 1976
    Count: 4s
       Megastygarctides setoloso Morgan & O'Reilly, 1988
      Count: -