Oxobacter pfennigii (Krumholz and Bryant 1985) Collins et al. 1994 Universal Root Woese et al. 1990 Bacteria (None 2015) Woese et al. 1990 Firmicutes (sic) Gibbons and Murray 2021 Bacillota corrig. Gibbons and Murray 2021 Firmacutes (sic) Gibbons and Murray 2021 Clostridia Rainey 2010 Eubacteriales Buchanan 1917 (Approved Lists 1980) emend. Tindall 2019 Clostridiaceae Pribram 1933 (Approved Lists 1980) emend. Spring 2021 Oxobacter Collins et al. 1994 Oxobacter pfennigii (Krumholz and Bryant 1985) Collins et al. 1994 Oxobacter Collins et al. 1994 Clostridium pfennigii Krumholz and Bryant 1985 Oxobacter pfennigii (Krumholz and Bryant 1985) Collins et al. 1994 Collins M.D. Lawson P.A. Willems A. Cordoba J.J. Fernandez-Garayzabal J. Garcia P. Cai J. Hippe H. Farrow J.A.E. The phylogeny of the genus Clostridium: proposal of five new genera and eleven new species combinations. 1994 44 4 812 826 International Journal of Systematic Bacteriology Int J Syst Bacteriol 0020-7713 10.1099/00207713-44-4-812 7981107 Collins M.D. Lawson P.A. Willems A. Cordoba J.J. Fernandez-Garayzabal J. Garcia P. Cai J. Hippe H. Farrow J.A.E. The phylogeny of the genus Clostridium: proposal of five new genera and eleven new species combinations. 1994 44 4 812 826 International Journal of Systematic Bacteriology Int J Syst Bacteriol 0020-7713 10.1099/00207713-44-4-812 7981107