RT Journal Article SR Electronic(1) A1 Gureeva, M. V. A1 Belousova, E. V. A1 Dubinina, G. A. A1 Novikov, A. A. A1 Kopitsyn, D. S. A1 Grabovich, M. Y.YR 2019 T1 Thioflexithrix psekupsensis gen. nov., sp. nov., a filamentous gliding sulfur bacterium from the family Beggiatoaceae JF International Journal of Systematic and Evolutionary Microbiology, VO 69 IS 3 SP 798 OP 804 DO https://doi.org/10.1099/ijsem.0.003240 PB Microbiology Society, SN 1466-5034, AB 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)., UL https://www.microbiologyresearch.org/content/journal/ijsem/10.1099/ijsem.0.003240