Blastomonas Sly and Cahill 1997 emend. Hiraishi et al. 2000 Blastomonas Sly and Cahill 1997 emend. Hiraishi et al. 2000 Blastomonas natatoria (Sly 1985) Sly and Cahill 1997 emend. Hördt et al. 2020 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 Sphingomonadales Yabuuchi and Kosako 2006 emend. Hördt et al. 2020 Sphingomonadaceae Kosako et al. 2000 emend. Hördt et al. 2020 Blastomonas Sly and Cahill 1997 emend. Hiraishi et al. 2000 Sphingomonadaceae Kosako et al. 2000 emend. Hördt et al. 2020 Zymomonas Kluyver and van Niel 1936 emend. Carr 1974 (Approved Lists 1980) Sphingobium Takeuchi et al. 2001 emend. Li et al. 2013 Sphingosinicella Maruyama et al. 2006 emend. Qiao et al. 2019 Sandaracinobacter Yurkov et al. 1997 emend. Lee et al. 2020 Erythromonas Yurkov et al. 1997 Novosphingobium Takeuchi et al. 2001 Sandarakinorhabdus Gich and Overmann 2006 emend. Cai et al. 2018 Rhizomonas van Bruggen et al. 1990 Sphingopyxis Takeuchi et al. 2001 emend. Hördt et al. 2020 Sphingomonas Yabuuchi et al. 1990 emend. Feng et al. 2017 Sphingomicrobium Kämpfer et al. 2012 emend. Shahina et al. 2013 Parasphingopyxis Uchida et al. 2012 emend. Jeong et al. 2017 Sphingorhabdus Jogler et al. 2013 emend. Feng et al. 2020 Hephaestia Felföldi et al. 2014 Polymorphobacter Fukuda et al. 2014 emend. Jia et al. 2015 Parablastomonas Ren et al. 2015 Pacificamonas (sic) Liu et al. 2016 Pacificimonas corrig. Liu et al. 2016 Sphingoaurantiacus Kim et al. 2015 emend. Tan et al. 2016 Binariimonas Zhao et al. 2016 Rhizorhabdus Francis et al. 2014 emend. Kim et al. 2015 Stakelama Chen et al. 2010 Rhizorhapis Francis et al. 2014 Aquisediminimonas Jin et al. 2019 Chakrabartia Jani et al. 2019 Sphingosinithalassobacter Hetharua et al. 2019 Aestuariisphingobium Li et al. 2020 Allosphingosinicella Hördt et al. 2020 Elkelangia Hördt et al. 2020 Parasphingorhabdus Feng et al. 2020 Novosphingopyxis Feng et al. 2020 emend. Zhou et al. 2021 Chioneia Tahon et al. 2022 Blastomonas aquatica Xiao et al. 2015 Blastomonas ursincola (Yurkov et al. 1997) Hiraishi et al. 2000 Blastomonas natatoria (Sly 1985) Sly and Cahill 1997 emend. Hördt et al. 2020 Blastomonas quesadae Castro et al. 2017 Blastomonas marina Meng et al. 2017 Blastomonas fulva Lee et al. 2017 Sly L.I. Hugenholtz P. Garrity G.M. Brenner D.J. Krieg N.R. Staley J.T. Genus II. Blastomonas 2005 2, Part C 2 258 Bergey's Manual of Systematic Bacteriology Springer New York 0387241450 Castro D.J. Llamas I. Béjar V. Martínez-Checa F. Blastomonas quesadae sp. nov., isolated from a saline soil by dilution-to-extinction cultivation 2017 67 6 2001 2007 International Journal of Systematic and Evolutionary Microbiology Int J Syst Evol Microbiol 1466-5026 1466-5034 10.1099/ijsem.0.001902 28631592 Sly L.I. Cahill M.M. Transfer of Blastobacter natatorius (Sly 1985) to the genus Blastomonas gen. nov. as Blastomonas natatoria comb. nov. 1997 47 2 566 568 International Journal of Systematic Bacteriology Int J Syst Bacteriol 0020-7713 10.1099/00207713-47-2-566 9103650 Hiraishi A. Kuraishi H. Kawahara K. Emendation of the description of Blastomonas natatoria (Sly 1985) Sly and Cahill 1997 as an aerobic photosynthetic bacterium and reclassification of Erythromonas ursincola Yurkov et al. 1997 as Blastomonas ursincola comb. nov. 2000 50 3 1113 1118 International Journal of Systematic and Evolutionary Microbiology Int J Syst Evol Microbiol 1466-5026 1466-5034 10.1099/00207713-50-3-1113 10843052 Meng Y.-C. Liu H.-C. Kang Y.-Q. Zhou Y.-G. Cai M. Blastomonas marina sp. nov., a bacteriochlorophyll-containing bacterium isolated from seawater 2017 67 8 3015 3019 International Journal of Systematic and Evolutionary Microbiology Int J Syst Evol Microbiol 1466-5026 1466-5034 10.1099/ijsem.0.002070 28820113 Xiao N. Liu Y. Liu X. Gu Z. Jiao N. Liu H. Zhou Y. Shen L. Blastomonas aquatica sp. nov., a bacteriochlorophyll-containing bacterium isolated from lake water 2015 65 5 1653 1658 International Journal of Systematic and Evolutionary Microbiology Int J Syst Evol Microbiol 1466-5026 1466-5034 10.1099/ijs.0.000153 25724744 Lee H.-G. Ko S.-R. Lee J.-W. Lee C.S. Ahn C.-Y. Oh H.-M. Jin L. Blastomonas fulva sp. nov., aerobic photosynthetic bacteria isolated from a Microcystis culture 2017 67 8 3071 3076 International Journal of Systematic and Evolutionary Microbiology Int J Syst Evol Microbiol 1466-5026 1466-5034 10.1099/ijsem.0.002084 28820119 Erythromonas Yurkov et al. 1997 Sly L.I. Cahill M.M. Transfer of Blastobacter natatorius (Sly 1985) to the genus Blastomonas gen. nov. as Blastomonas natatoria comb. nov. 1997 47 2 566 568 International Journal of Systematic Bacteriology Int J Syst Bacteriol 0020-7713 10.1099/00207713-47-2-566 9103650 Hiraishi A. Kuraishi H. Kawahara K. Emendation of the description of Blastomonas natatoria (Sly 1985) Sly and Cahill 1997 as an aerobic photosynthetic bacterium and reclassification of Erythromonas ursincola Yurkov et al. 1997 as Blastomonas ursincola comb. nov. 2000 50 3 1113 1118 International Journal of Systematic and Evolutionary Microbiology Int J Syst Evol Microbiol 1466-5026 1466-5034 10.1099/00207713-50-3-1113 10843052 TODO (garrity): RFO Yabuuchi et al. 1999 (rid.4631) transferred Blastomonas natatoria and Erythromonas ursincola (the type and only species in their genera at the time) into the genus Sphingomonas. This unified the genera Blastomonas and Erythromonas with Sphingomonas. Hiraishi et al. 2000 (rid.4321) basically undo the taxonomic changes made by Yabuuchi et al. 1999. They retain the genus Blastomonas, transfer E. ursincola to Blastomoas as B. ursincola and give an emended description of B. natatoria. Recently, a novel species of Blastomonas was described, further complicating the problem. The outstanding questions are: 1. What is the status of Blastomonas? 2. To which genus is Erythromonas unified? 3. What is the status of the species with the epithet ursincola? 4. What is the status of the new species of Blastomonas? For now, I've recorded the 1999 unification and marked it as ignored, since the public consensus is that it was revered. However, we need an opinion on this.