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 Spumaretrovirinae Genus Simiispumavirus Western lowland gorilla simian foamy virus