Metazoa Haeckel 1874 - multicellular animals see Kingdom Animalia Linnaeus, 1758
   Planulozoa Wallberg, Thollesson, Farris & Jondelius 2004
     Bilateria Hatschek, 1888 - bilaterians see Subkingdom Bilateria Hatschek, 1888
       Nephrozoa Jondelius, Ruiz-Trillo, Baguñà & Riutort 2002
         Protostomia Grobben, 1908 see Infrakingdom Protostomia Grobben, 1908
           Spiralia Schleip, 1929 - spiralians see Superphylum Spiralia Schleip, 1929
             Platytrochozoa Struck, Wey-Fabrizius, Golombek, Hering, Weigert, Bleidorn, Klebow, Iakovenko, Hausdorf, Petersen, Kück, Herlyn & Hankeln 2014
               Rouphozoa Struck, Wey-Fabrizius, Golombek, Hering, Weigert, Bleidorn, Klebow, Iakovenko, Hausdorf, Petersen, Kück, Herlyn & Hankeln 2014
                 [Phylum] Gastrotricha Metschnikoff, 1864 - gastrotrichs