Pan-Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   [crown] Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
     [crown] Eukarya R. Creti, F. Citarella, O. Tiboni, A. Sanangelantoni, P. Palm & P. Cammarano 1991 [Simpson 2020] see Domain Eukarya Chatton, 1925
       [crown] Amorphea Adl et al. 2012 [Simpson, Medina & Adl 2020]
         [crown] Opisthokonta Cavalier-Smith 1987 [Simpson & Medina 2020] - animal-fungal clade
           [crown] Metazoa Haeckel 1874 [Garey & Halanych 2020] see Kingdom Animalia Linnaeus, 1758
             [crown] Cnidaria Verrill 1865 [Collins, Daly & Dunn 2020]
               [crown] Medusozoa Peterson 1979 [Collins & Dunn 2020] see Subphylum Medusozoa Petersen, 1979
                 [crown] Hydrozoa Owen 1843 [Dunn & Collins 2020] see Class Hydrozoa Owen, 1843
                   1 Trachylina Haeckel 1879 [Dunn & Collins 2020] see Order Trachylina Haeckel, 1879
                   2 Hydroidolina Collins 2000 [Collins & Dunn 2020]