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" Genomoviridae Gemykibivirus Black robin associated gemykibivirus 1