Ahrensia Uchino et al. 1999 emend. Liu et al. 2016 Ahrensia kielensis (ex Ahrens and Rheinheimer 1967) Uchino et al. 1999 emend. Liu et al. 2016 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 Alphaproteobacteria Garrity et al. 2006 Hyphomicrobiales Douglas 1957 (Approved Lists 1980) emend. Hördt et al. 2020 Ahrensiaceae Hördt et al. 2020 Ahrensia Uchino et al. 1999 emend. Liu et al. 2016 Ahrensiaceae Hördt et al. 2020 Pseudahrensia Jung et al. 2012 Ahrensia sp. None 2015 Ahrensia kielensis (ex Ahrens and Rheinheimer 1967) Uchino et al. 1999 emend. Liu et al. 2016 Ahrensia marina Liu et al. 2016 Lee K.B. Liu C.T. Anzai Y. Kim H. Aono T. Oyaizu H. The hierarchical system of the 'Alphaproteobacteria': description of Hyphomonadaceae fam. nov., Xanthobacteraceae fam. nov. and Erythrobacteraceae fam. nov. 2005 55 5 1907 1919 International Journal of Systematic and Evolutionary Microbiology Int J Syst Evol Microbiol 1466-5026 1466-5034 10.1099/ijs.0.63663-0 16166687 Uchino Y. Hirata A. Yokota A. Sugiyama J. Reclassification of marine Agrobacterium species: Proposals of Stappia stellulata gen. nov., comb. nov., Stappia aggregata sp. nov., nom. rev., Ruegeria atlantica gen. nov., comb. nov., Ruegeria gelatinovora comb. nov., Ruegeria algicola comb. nov., and Ahrensia kieliense gen. nov., sp. nov., nom. rev. 1998 44 3 201 210 The Journal of General and Applied Microbiology J Gen Appl Microbiol 0022-1260 1349-8037 12501429 Liu J. Wang Y. Liu Y. Zhang X.H. Ahrensia marina sp. nov., a dimethylsulfoniopropionate-cleaving bacterium isolated from seawater, and emended descriptions of the genus Ahrensia and Ahrensia kielensis 2016 66 2 874 880 International Journal of Systematic and Evolutionary Microbiology Int J Syst Evol Microbiol 1466-5026 1466-5034 10.1099/ijsem.0.000805 26620276 Hördt A. García-López M. Meier-Kolthoff J.P. Tindall B.J. Weinhold L.-M. Gronow S. Kyrpides N. Woyke T. Schleuning M. Göker M. Analysis of 1,000+ Type-Strain Genomes Substantially Improves Taxonomic Classification of Alphaproteobacteria 2020 11 468 Frontiers in Microbiology Front. Microbio. 1664-302X 10.3389/fmicb.2020.00468 32373076 Garrity G.M. Bell J.A. Lilburn T. Garrity G.M. Brenner D.J. Krieg N.R. Staley J.T. Family I. Rhodobacteraceae fam. nov. 2005 2, Part C 2 161 Bergey's Manual of Systematic Bacteriology Springer New York 0387241450 No reference is available 2015