Calderobacterium Kryukov et al. 1984 Calderobacterium Kryukov et al. 1984 Calderobacterium hydrogenophilum Kryukov et al. 1984 Universal Root Woese et al. 1990 Bacteria (None 2015) Woese et al. 1990 Aquificota corrig. Reysenbach 2021 Aquificae (sic) Reysenbach 2021 non Aquificae Reysenbach 2002 Aquificae Reysenbach 2002 emend. Gupta and Lali 2013 non Aquificae Reysenbach 2021 Aquificales Reysenbach 2002 emend. Gupta and Lali 2013 Aquificaceae Reysenbach 2002 emend. Gupta and Lali 2013 Calderobacterium Kryukov et al. 1984 Aquificaceae Reysenbach 2002 emend. Gupta and Lali 2013 Hydrogenobaculum Stöhr et al. 2001 Thermocrinis Huber et al. 1999 Hydrogenobacter Kawasumi et al. 1984 Hydrogenivirga Nakagawa et al. 2004 Aquifex Huber et al. 1992 Calderobacterium hydrogenophilum Kryukov et al. 1984 Kryukov V.R. Savelyeva N.D. Pusheva M.A. Calderobacterium hydrogenophilum nov. gen., nov. sp., an extreme thermophilic bacterium and its hydrogenase activity. 1983 52 781 788 Mikrobiologiya (Russian) 0026-3656 List Editor Validation List no. 14. Validation of the publication of new names and new combinations previously effectively published outside the IJSB. 1984 34 2 270 271 International Journal of Systematic Bacteriology Int J Syst Bacteriol 0020-7713 10.1099/00207713-34-2-270 Kryukov V.R. Savelyeva N.D. Pusheva M.A. Calderobacterium hydrogenophilum nov. gen., nov. sp., an extreme thermophilic bacterium and its hydrogenase activity. 1983 52 781 788 Mikrobiologiya (Russian) 0026-3656 TODO (garrity): RFO: Stöhr et al. 2001 incorrectly established a unification by moving the type strain and species of Calderobacterium into this genus. Calderobacterium actually has priority over Hydrogenobacter because Calderobacterium was on a Validation List in IJSB v34(2) 1984, and Hydrogenobacter was VP in 34(1) 1984. However, the unification event was from Calderobacterium into Hydrogenobacter. The unification of Calderobacterium into Hydrogenobacter contravenes the Code because Calderobacterium has priority over Hydrogenobacter.