Natura - nature
Ref: C. Linnaeus, 1748: 210
   actualia - actual entities
  Ref: A. Voltolini, 2006: 44 (note 19) [assumed position]
     Mundus Plinius - physical world
    Ref: C. Linnaeus, 1758: 5 [indirect position]; 24 Apr 2014.
       naturalia - natural bodies
      Ref: C. Linnaeus, 1758: 6 [implicit position]
         [crown] Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
        Ref: J. Wiemann et al., 2020: [13] [validation] [inferred position]
           ?"viruses"
          Ref: J. Wiemann et al., 2020: [13]
             Realm Riboviria
            Ref: ICTV, 2018b; CoL(17 Aug 2023).
               Order Nidovirales
              Ref: ICTV, 2018b; 2017.015S.A.v1.Nidovirales.docx; 2017.006G.A.v1.Riboviria.docx; ICTV, 2012: 1100; D. Cavanagh, 1997.
                 Suborder Arnidovirineae [monotypic]
                Ref: ICTV, 2018b; 2017.015S.A.v1.Nidovirales.docx.
                   Family Arteriviridae
                  Ref: ICTV, 2018b; 2017.001S.A.v1.Crocarterivirinae.docx; 2017.012S.A.v1.Nidovirales.docx.
                     Subfamily Simarterivirinae
                    Ref: ICTV, 2018b
                       Genus Deltaarterivirus [polyphyletic]
                      Ref: ICTV, 2018b
                         Subgenus Hedartevirus [monotypic]
                        Ref: ICTV, 2018b:
                           1 Deltaarterivirus hemfevᵀ
                          Ref: ICTV, 2018b