Abstract
Abstract Broc'ki.a. N.L. fem. n. Brockia named in honor of the American microbiologist Thomas Dale Brock for his invaluable impact to our knowledge of thermophilic prokaryotes inhabiting volcanic environments. Firmicutes / Clostridia / Thermoanaerobacterales / Brockiaceae / Brockia Extremely thermophilic. Strictly anaerobic. Cells are spore‐forming rods with a Gram‐positive type of cell wall. Chemolithoautotrophic. Elemental sulfur, thiosulfate, or polysulfide are used as electron acceptors and molecular hydrogen or formate as electron donors. Growth at 46 –78°C and pH 5.5–8.5. The optimal growth (doubling time, 6.0 h) was at 60–65°C. The major fatty acid is C 16:0 . DNA G + C content is 63.4 mol% (genome). 16S rRNA gene sequence analysis places the genus in the family Brockiaceae . The most closely related strains are members of the genera Ammonifex and Caldanaerobacter . The genus currently accommodates the only one species Brockia lithotrophica . Known habitats are thermal hot springs. DNA G + C content (mol%) : 63.4 (genome). Type species : Brockia lithotrophica Perevalova et al. 2013, 482.
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