sp. nov., isolated from estuarine sediment of the Arakawa River.

A Gram-stain-negative, rod-shaped, non-motile and strictly aerobic bacterium, which showed biofilm-forming ability on polystyrene, designated as strain B-399, was isolated from the estuarine sediment of the Arakawa River near Tokyo Bay. It grew at pH 6.0-8.5, at 15-35 °C and in the presence of 0-7.5 % (w/v) NaCl. Phylogenetic analysis based on 16S rRNA gene sequences showed that strain B-399 was clustered in the genus and has 96.94 % sequence similarity to X12M-4, which was the only validly described species in this genus. On the basis of our genome sequencing analyses, the average nucleotide identity and digital DNA-DNA hybridization values between strains B-399 and X12M-4 were 79.54 and 22.30 %, respectively, which confirms that strain B-399 represents a novel species of the genus . The draft genome size and the DNA G+C content of strain B-399 were 4.12 Mb and 65.2 mol%, respectively. The major fatty acids (>10 %) of strain B-399 were C, summed feature 8 (C 6 and/or C 7) and C cyclo 8. The polar lipids were phosphatidylcholine, phosphatidylglycerol, an unidentified phospholipid, an unidentified aminolipid and unidentified lipids. The respiratory quinone was Q-10. These chemotaxonomic features were almost coincident with those of the genus . Therefore, strain B-399 should be classified as representing a new species of the genus , for which the name sp. nov. is proposed. The type strain is B-399 (=NBRC 115629=DSM 114148).