Arachnia Pine and Georg 1969 (Approved Lists 1980) emend. Tindall 2019 Arachnia Pine and Georg 1969 (Approved Lists 1980) emend. Tindall 2019 Arachnia propionica (Buchanan and Pine 1962) Pine and Georg 1969 (Approved Lists 1980) emend. Tindall 2019 Universal Root Woese et al. 1990 Bacteria (None 2015) Woese et al. 1990 Actinobacteria (sic) Goodfellow 2021 non Actinobacteria Stackebrandt et al. 1997 Actinomycetota corrig. Goodfellow 2021 Actinobacteriota corrig. Goodfellow 2021 Actinomycetes Krasil'nikov 1949 (Approved Lists 1980) Propionibacteriales (Rainey et al. 1997) Patrick and McDowell 2015 emend. Nouioui et al. 2018 Propionibacteriaceae Delwiche 1957 (Approved Lists 1980) emend. Zhi et al. 2009 Arachnia Pine and Georg 1969 (Approved Lists 1980) emend. Tindall 2019 Propionibacteriaceae Delwiche 1957 (Approved Lists 1980) emend. Zhi et al. 2009 Tessaracoccus Maszenan et al. 1999 emend. Zhou et al. 2020 Brooklawnia Rainey et al. 2006 Propionimicrobium Stackebrandt et al. 2002 Granulicoccus Maszenan et al. 2007 Friedmanniella Schumann et al. 1997 Micropruina Shintani et al. 2000 Propionicicella Bae et al. 2006 Propionicimonas Akasaka et al. 2003 Auraticoccus Alonso-Vega et al. 2011 emend. Cheema et al. 2020 Naumannella Rieser et al. 2012 emend. Tian et al. 2017 Mariniluteicoccus Zhang et al. 2014 Acidipropionibacterium Scholz and Kilian 2016 Cutibacterium Scholz and Kilian 2016 emend. Dekio et al. 2019 Pseudopropionibacterium Scholz and Kilian 2016 pro synon. Arachnia Pine and Georg 1969 (Approved Lists 1980) emend. Tindall 2019 Raineyella Pikuta et al. 2016 Luteococcus Tamura et al. 1994 emend. Collins et al. 2000 Propioniferax Yokota et al. 1994 Microlunatus Nakamura et al. 1995 emend. Nouioui et al. 2018 Propionibacterium Orla-Jensen 1909 (Approved Lists 1980) emend. Scholz and Kilian 2016 Aestuariimicrobium Jung et al. 2007 emend. Chen et al. 2018 Propioniciclava Sugawara et al. 2011 emend. Li et al. 2022 Desertihabitans Sun et al. 2019 emend. Liu et al. 2020 Brevilactibacter Wenning et al. 2020 Vaginimicrobium Diop et al. 2020 Parenemella Bernard et al. 2020 Ponticoccus Lee and Lee 2008 non Ponticoccus Hwang and Cho 2008 Enemella Bernard et al. 2020 Arachnia propionica (Buchanan and Pine 1962) Pine and Georg 1969 (Approved Lists 1980) emend. Tindall 2019 Arachnia rubra (Saito et al. 2018) Tindall 2019 Pine L.S. Georg L.K. Buchanan R.E. Gibbons N.E. Genus Arachnia Pine and Georg 1969, 269 1974 8 668 669 Bergey's Manual of Determinative Bacteriology The Williams and Wilkins Co. Baltimore 0683011170 Pine L. Georg L.K. Reclassification of Actinomyces propionicus 1969 19 3 267 272 International Journal of Systematic Bacteriology Int J Syst Bacteriol 0020-7713 10.1099/00207713-19-3-267 Charfreitag O. Collins M.D. Stackebrandt E. Reclassification of Arachnia propionica as Propionibacterium propionicus comb. nov. 1988 38 4 354 357 International Journal of Systematic Bacteriology Int J Syst Bacteriol 0020-7713 10.1099/00207713-38-4-354 Tindall B.J. Arachnia propionica (Buchanan and Pine 1962) Pine and Georg 1969 (Approved Lists 1980), Propionibacterium propionicum corrig. (Buchanan and Pine 1962) Charfreitag et al. 1988 and Pseudopropionibacterium propionicum (Buchanan and Pine 1962) Scholz and Kilian 2016 and the nomenclatural consequences of changes in the taxonomy of the genus Propionibacterium. 2019 69 8 2612 2615 International Journal of Systematic and Evolutionary Microbiology Int J Syst Evol Microbiol 1466-5026 1466-5034 10.1099/ijsem.0.003442 31120826 Pseudopropionibacterium Scholz and Kilian 2016 pro synon. Arachnia Pine and Georg 1969 (Approved Lists 1980) emend. Tindall 2019 Pseudopropionibacterium Scholz and Kilian 2016 pro synon. Arachnia Pine and Georg 1969 (Approved Lists 1980) emend. Tindall 2019 Pine L.S. Georg L.K. Buchanan R.E. Gibbons N.E. Genus Arachnia Pine and Georg 1969, 269 1974 8 668 669 Bergey's Manual of Determinative Bacteriology The Williams and Wilkins Co. Baltimore 0683011170 Pine L. Georg L.K. Reclassification of Actinomyces propionicus 1969 19 3 267 272 International Journal of Systematic Bacteriology Int J Syst Bacteriol 0020-7713 10.1099/00207713-19-3-267 Tindall B.J. Arachnia propionica (Buchanan and Pine 1962) Pine and Georg 1969 (Approved Lists 1980), Propionibacterium propionicum corrig. (Buchanan and Pine 1962) Charfreitag et al. 1988 and Pseudopropionibacterium propionicum (Buchanan and Pine 1962) Scholz and Kilian 2016 and the nomenclatural consequences of changes in the taxonomy of the genus Propionibacterium. 2019 69 8 2612 2615 International Journal of Systematic and Evolutionary Microbiology Int J Syst Evol Microbiol 1466-5026 1466-5034 10.1099/ijsem.0.003442 31120826 Skerman V.B.D. McGowan V. Sneath P.H.A. Approved Lists of Bacterial Names 1980 30 1 225 420 International Journal of Systematic Bacteriology Int J Syst Bacteriol 0020-7713 10.1099/00207713-30-1-225 The unification of Arachnia with Propionibacterium proposed by Charfreitag et al. 1988 was essentially reversed by the creation of Pseudopropionibacterium Scholz and Kilian 2016. Tindall 2019 asserts that Arachnia Pine and Georg 1969 (Approved Lists 1980) has priority over Pseudopropionibacterium Scholz and Kilian 2016.