Azotobacteraceae Pribram 1933 (Approved Lists 1980) Azotobacter Beijerinck 1901 emend. Johnstone 1974 (Approved Lists 1980) Universal Root Woese et al. 1990 Bacteria (None 2015) Woese et al. 1990 Proteobacteria (sic) Garrity et al. 2021 Pseudomonadota corrig. Garrity et al. 2021 Alphaproteobacteriota (sic) Garrity et al. 2021 Gammaproteobacteria Garrity et al. 2005 emend. Williams and Kelly 2013 Pseudomonadales Orla-Jensen 1921 (Approved Lists 1980) emend. Liao et al. 2020 Pseudomonadineae Breed et al. 1957 (Approved Lists 1980) Azotobacteraceae Pribram 1933 (Approved Lists 1980) Pseudomonadineae Breed et al. 1957 (Approved Lists 1980) Nitrobacteraceae Buchanan 1917 (Approved Lists 1980) emend. Hördt et al. 2020 Pseudomonadaceae Winslow et al. 1917 (Approved Lists 1980) Caulobacteraceae Henrici and Johnson 1935 (Approved Lists 1980) Spirillaceae Migula 1894 (Approved Lists 1980) Azorhizophilus Thompson and Skerman 1981 Azomonotrichon Thompson and Skerman 1981 Azotobacter Beijerinck 1901 emend. Johnstone 1974 (Approved Lists 1980) Azomonas Winogradsky 1938 emend. Johnstone 1974 (Approved Lists 1980) Beijerinckia Derx 1950 emend. Becking 1974 (Approved Lists 1980) Derxia Jensen et al. 1960 emend. Becking 1974 (Approved Lists 1980) Young J.M. Park D.C. Probable synonymy of the nitrogen-fixing genus Azotobacter and the genus Pseudomonas. 2007 57 12 2894 2901 International Journal of Systematic and Evolutionary Microbiology Int J Syst Evol Microbiol 1466-5026 1466-5034 10.1099/ijs.0.64969-0 18048745 Derx H.G. Beijerinckia, a new genus of nitrogen-fixing bacteria occurring in tropical soils. 1950 53 140 147 Proceedings of the Koninklijke Nederlandse Akademie van Wetenschappen. Series C. Biological and Medical Sciences Proc K Ned Akad Wet C 0023-3374 Pribram E. Klassification der Schizomyceten. 1933 1 143 Klassifikation der Schizomyceten (Bakterien) Franz Deuticke Leipzig Winogradsky S. Sur la morphologie et l'écologie des Azotobacter. 1938 60 4 351 400 Annales de l'Institut Pasteur Ann Inst Pasteur (Paris) 0020-2444 Jensen H.L. Petersen E.J. De P.K. Bhattacharya R. A new nitrogen-fixing bacterium: Derxia gummosa nov. gen. nov. spec. 1960 36 182 195 Archiv für Mikrobiologie Arch Mikrobiol 0003-9276 14407096 Thompson J.P. Skerman V.B.D. Thompson J.P. Skerman V.B.D. 1979 1 405 Azotobacteraceae: The Taxonomy and Ecology of the Aerobic Nitrogen-Fixing Bacteria Academic Press London 0126890501