Description of sp. nov. and reclassification of as gen. nov., comb. nov.

A novel obligately anaerobic spirochete strain K2 was isolated from bottom marine sediments at Crater Bay of Yankicha Island (Kuril Islands, Russia). Strain K2 had helical shape and Gram-negatively stained. The optimal growth conditions were as follows: the optimum temperature was 28-30 °C with range 5-34 °C; optimal pH at 7.0-7.5 with range of 6.8-8.5; NaCl optimum at 3-3.5 % (w/v) and range of 1-7 % (w/v). Strain K2 was catalase- and oxidase-negative. Glucose fermentation products were acetate, lactate, ethanol, CO, H. The major fatty acids were C, -C, -C C DMA, -C DMA. The G+C content of genomic DNA was 43.2 mol%. Phylogenetic analyses of 16S rRNA genes showed that strain K2 belonged to the genus of the family . The 16S rRNA gene sequence similarity of strain K2 and DSM 2029 and DSM 104770 was 96 and 94 %, respectively. Based on the results of our study, we propose the name sp. nov.; type strain K2 (=DSM 16308=VKM B-3266). Also, the taxonomic status of was revised: 16S rRNA genes sequence showed less than 89 % similarity to nearest phylogenetic neighbours. Therefore, we proposed to separate this species into a novel genus gen. nov., comb. nov.