Novel bacterial species were isolated from sediments adjacent to sperm whale carcasses off Kagoshima, Japan, at a depth of 226–246 m. The isolated strains, JAMM 0745, JAMM 1380, JAMM 1475 and JAMM 1610, were Gram-negative, rod-shaped, non-spore-forming and motile by means of a single polar or subterminal flagellum. Phylogenetic analysis based on 16S rRNA gene sequences of the novel isolates indicated a relationship to a symbiotic bacterial clone of the polychaete (99.6–99.9 % sequence similarity) and these bacteria were closely related to members of the genus (95.6–96.0 % similarity) within the class . The novel strains were able to produce isoprenoid quinone Q-8 as the major quinone component. The predominant fatty acids were C, C and C, with C and C present in smaller amounts. The DNA G+C contents of the four novel strains were about 43.6–43.8 mol%. Based on the taxonomic differences observed, the four isolated strains appear to represent a novel species of the genus . The name sp. nov. (type strain JAMM 0745=JCM 14595=DSM 18939) is proposed for the novel strains.


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