[organisms] see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Domain Bacteria Woese et al. 1990
     Phylum "Proteobacteria" Garrity et al. 2005 see Superphylum Proteobacteria Craig et al. 2010
       Class Gammaproteobacteria Garrity et al. 2005
         Order Pasteurellales Garrity et al. 2005
           Family Pasteurellaceae Pohl 1981
             Genus Actinobacillus Brumpt 1910 (Approved Lists 1980)
               [Actinobacillus equuli] (van Straaten 1918) Haupt 1934 (Approved Lists 1980)
                 Actinobacillus equuli subsp. equuliᵀ (van Straaten 1918) Christensen et al. 2002