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"
             Family Parvoviridae
               Subfamily Parvovirinaeᵀ
                 [Genus Erythrovirus]
                   1 [Human parvovirus B19ᵀ]
                   1.0 [B19 virusᵀ ICTV 7th Report (2000)] see Human parvovirus B19
                   2 [Pig-tailed macaque parvovirus]
                   3 [Rhesus macaque parvovirus]
                   4 [Simian parvovirus]