Mariniflexile soesokkakense Sp. Nov., a member of the family Flavobacteriaceae isolated from the junction between the North Pacific Ocean and a freshwater spring, and emended description of the genus Mariniflexile

A Gram-negative, non-flagellated and rod-shaped bacterial strain able to move by gliding, designated RSSK-9^T, was isolated from the junction between the North Pacific Ocean and a freshwater spring at Jeju island, South Korea. Strain RSSK-9^T was found to grow optimally at 30 C, at pH 7.0-8.0 and in the presence of 2.0 % (w/v) NaCl. Phylogenetic trees based on 16S rRNA gene sequences revealed that strain RSSK-9^T fell within the clade comprising Mariniflexile species. Strain RSSK-9^T exhibits 16S rRNA gene sequence similarity values of 97.1-98.8 % to the type strains of Mariniflexile species and of less than 95.6 % sequence similarity to the type strains of the other recognized species. Strain RSSK-9^T was found to contain MK-6 as the predominant menaquinone and iso-C_15:0, iso-C _15:1 G, iso-C_17:0 3-OH and iso-C_15:0 3-OH as the major fatty acids. The major polar lipids of strain RSSK-9^T were identified as phosphatidylethanolamine and one unidentified lipid. The DNA G+C content of strain RSSK-9^T was determined to be 34.6 mol% and its DNA-DNA relatedness values with the type strains of the four Mariniflexile species were in the range 11-28 %. The differential phenotypic properties, together with the phylogenetic and genetic distinctiveness, revealed that strain RSSK-9^T is separate from other Mariniflexile species. On the basis of the data presented, strain RSSK-9^T is considered to represent a novel species of the genus Mariniflexile, for which the name Mariniflexile soesokkakense Sp. Nov. is proposed. The type strain is RSSK-9^T (= KCTC 32427^T = CECT 8369^T). An emended description of the genus Mariniflexile is given.