[organisms] see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Phylum Tardigrada Doyère, 1840 - tardigrades
     Order Heterotardigrada Marcus, 1927 see Class Heterotardigrada Marcus, 1927
       Family Halechiniscidae Thulin, 1928
         Genus Actinarctus Schulz, 1935
           1 Actinarctus doryphorus Schulz, 1935
           2 Actinarctus neretinus Grimaldi de Zio et al., 1982
           3 Actinarctus physophorus Grimaldi de Zio et al., 1982