[life] see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   1 Empire Prokaryota (Dougherty 1957) Allsopp 1969 see Domain Bacteria Woese et al. 1990
   2 Empire Eukaryota (Chatton, 1925) see Domain Eukaryota Chatton, 1925