%0 Journal Article %A Gureeva, M. V. %A Belousova, E. V. %A Dubinina, G. A. %A Novikov, A. A. %A Kopitsyn, D. S. %A Grabovich, M. Y. %T Thioflexithrix psekupsensis gen. nov., sp. nov., a filamentous gliding sulfur bacterium from the family Beggiatoaceae %D 2019 %J International Journal of Systematic and Evolutionary Microbiology, %V 69 %N 3 %P 798-804 %@ 1466-5034 %R https://doi.org/10.1099/ijsem.0.003240 %K sulfur-oxidizing bacteria %K Beggiatoaceae %K Thioflexithrix psekupsensis gen. nov., sp. nov. %I Microbiology Society, %X A sulfur-oxidizing, filamentous, gliding micro-organism, strain D3T, was isolated from a sulfidic spring in Goryachy Klyuch, Krasnodar, Russia. The cell walls were Gram-negative. The new isolate was a microaerophilic facultative anaerobe and an obligate chemolithoautotroph. The pH range for growth was pH 6.8–7.6, with an optimum at pH 7.2. The temperature range for growth was 10–46 °C, with an optimum at 32 °C. The G+C content of DNA was 42.1 mol%. Phylogenetic analysis of the 16S rRNA gene showed that strain D3T belongs to the family Beggiatoaceae , order Thiotrichales and was distantly related to the genera of the family Beggiatoaceae (86–88 % sequence similarity). The major respiratory quinone was ubiquinone-6. Major fatty acids were C18:1 ω7 (37.6 %), C16 : 0 (34.7 %) and C16: 1 ω7 (27.7 %). On the basis of its physiological properties and the results of phylogenetic analysis, strain D3T is considered to represent a novel species of a new genus, for which the name Thioflexithrix psekupsensis gen. nov., sp. nov. is proposed. The type strain is D3T (=KCTC 62399=UNIQEM U981). %U https://www.microbiologyresearch.org/content/journal/ijsem/10.1099/ijsem.0.003240