Natura - nature
   actualia - actual entities
     Mundus Plinius - physical world
       naturalia - natural bodies
         [crown] Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
           ?"viruses"
             Order Ortervirales
               Family Retroviridae
                 Subfamily Orthoretrovirinae
                   Genus Lentivirus
                     1.1.1 Equine infectious anemia virus
                     1.1.2.1 Jembrana disease virus
                     1.1.2.2 Bovine immunodeficiency virus
                     1.2.1.1 Caprine arthritis encephalitis virus
                     1.2.1.2 Visna-maedi virus
                     1.2.2.1 Feline immunodeficiency virus
                     1.2.2.2 Puma lentivirus
                     2.1.1 Simian immunodeficiency virus
                     2.1.2 Human immunodeficiency virus 1ᵀ
                     2.2 Human immunodeficiency virus 2