Methylococcaceae Whittenbury and Krieg 1984 emend. Bowman et al. 1993 Methylococcaceae Whittenbury and Krieg 1984 emend. Bowman et al. 1993 Methylococcus Foster and Davis 1966 (Approved Lists 1980) emend. Bowman et al. 1993 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 Methylococcales Bowman 2005 Methylococcaceae Whittenbury and Krieg 1984 emend. Bowman et al. 1993 Methylococcales Bowman 2005 Methylothermaceae Hirayama et al. 2014 non Methylothermaceae Tindall 2019 Incertae sedis 415 Orata et al. 2018 Methylothermaceae (Hirayama et al. 2014) Tindall 2019 non Methylothermaceae Hirayama et al. 2014 Methylosarcina Wise et al. 2001 emend. Orata et al. 2018 Methylocaldum Bodrossy et al. 1998 emend. Takeuchi et al. 2014 Methylomicrobium Bowman et al. 1995 emend. 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