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A thermophilic bacterium, designated strain CR11(T), was isolated from a filamentous sample collected from a terrestrial hot spring on the south-western foothills of the Rincón volcano in Costa Rica. The Gram-negative cells are approximately 2.4-3.9 microm long and 0.5-0.6 microm wide and are motile rods with polar flagella. Strain CR11(T) grows between 65 and 85 degrees C (optimum 75 degrees C, doubling time 4.5 h) and between pH 4.8 and 7.8 (optimum pH 5.9-6.5). The isolate grows chemolithotrophically with S(0), S(2)O(2)(3)(-) or H(2) as the electron donor and with O(2) (up to 16 %, v/v) as the sole electron acceptor. The isolate can grow on mannose, glucose, maltose, succinate, peptone, Casamino acids, starch, citrate and yeast extract in the presence of oxygen (4 %) and S(0). Growth occurs only at NaCl concentrations below 0.4 % (w/v). The G+C content of strain CR11(T) is 40.3 mol%. Phylogenetic analysis of the 16S rRNA gene sequence places the strain as a close relative of Thermocrinis ruber OC 1/4(T) (95.7 % sequence similarity). Based on phylogenetic and physiological characteristics, we propose the name Thermocrinis minervae sp. nov., with CR11(T) (=DSM 19557(T) =ATCC BAA-1533(T)) as the type strain.

Thermocrinis minervae sp. nov., a hydrogen- and sulfur-oxidizing, thermophilic member of the Aquificales from a Costa Rican terrestrial hot spring