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Two novel marine, Gram-negative, non-motile, catalase- and oxidase-positive, aerobic bacteria were isolated from coastal seawater in Tokyo Bay. Analysis of almost-complete 16S rRNA gene sequences showed that the two isolates are members of the genus Paracoccus, sharing highest 16S rRNA gene sequence similarity (96.5 %) with Paracoccus aminophilus NBRC 16710T. The DNA–DNA reassociation values between P. aminophilus NBRC 16710T and these isolates were only 10–20 %, in contrast to the high DNA relatedness between the two isolates (89 %). At least 1 % (w/v) NaCl was required for growth. Cellular fatty acid profiles revealed C18 : 1 ω7c as the major component and C10 : 0 3-OH as the major hydroxy fatty acid. Ubiquinone-10 was detected as the major respiratory quinone. The G+C content of the genomic DNA of both strains was 69 mol%. On the basis of DNA–DNA hybridization data and physiological and chemotaxonomic characteristics, it is proposed that these strains should be placed in a novel species, Paracoccus marinus sp. nov. The type strain is KKL-A5T (=NBRC 100637T =CIP 108500T); KKL-B9 (=NBRC 100640) is a reference strain.
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