[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
         01 Genus Actinarctus Schulz, 1935
         02 Genus Bathyechiniscus Steiner, 1926
         03 Genus Exoclavarctus Renaud-Mornant, 1983
         04 Genus Florarctus Delamare Deboutteville & Renaud-Mornant, 1965
         05 Genus Halechiniscus Richters, 1908
         06 Genus Hemitanarctus Grimaldi de Zio et al., 1996 see Genus Dipodarctus L.W. Pollock, 1995
         07 Genus Orzeliscus du Bois-Reymond Marcus, 1952
         08 Genus Paratanarctus d'Addabbo Gallo et al., 1992
         09 Genus Pleocola Cantacuzène, 1951
         10 Genus Raiarctus Renaud-Mornant, 1981
         11 Genus Styraconyx Thulin, 1942
         12 Genus Tanarctus Renaud-Debyser, 1959
         13 Genus Tholoarctus Kristensen & Renaud-Mornant, 1983
         14 Genus Wingstrandarctus R.M. Kristensen, 1984