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A Gram-stain-negative, strictly aerobic, yellow-pigmented bacterial strain, designated as T28T, was isolated from seawater of the shallow-sea hydrothermal system, Kueishantao Islet, Taiwan, China. Cells were oxidase-negative and catalase-positive rods without gliding motility. Growth was observed at 10–40 °C (optimum, 30 °C), at pH 5.0–8.0 (optimum, pH 6.0) and in the presence of 0–5% (w/v) NaCl (optimum, 2.5%). Strain T28T contained menaquinone 6 as the only isoprenoid quinone. The main cellular fatty acids were iso-C15:0, iso-C15:1 G, and iso-C17:03-OH, summed feature 3 (C16:1ω7c/ω6c). Polar lipids contain diphosphatidylglycerol, phosphatidylethanolamine, two unidentified phospholipids, six unidentified lipids, an unidentified aminolipid, and one unidentified aminophospholipids. The genomic DNA G + C content was 34.4 mol%. The 16S rRNA gene sequence of strain T28T shared highest similarity with Maribacter arcticus (97.7%). Phylogenetic analysis based on 16S rRNA gene sequences revealed that the strain T28T belongs to the genus Maribacter. On the basis of phylogenetic data and several distinct phenotypic characteristics, strain T28T represents a novel species, for which the name Maribacter hydrothermalis sp. nov. is proposed. The type strain is T28T (=CGMCC 1.15788T = JCM 31510T). [ABSTRACT FROM AUTHOR]

An orange-pigmented, short-rod-shaped, aerobic and non-motile bacterial strain, designated TK008 T , was isolated from the shallow-sea hydrothermal systems off Kueishantao Island in Taiwan, China, and it was studied by using a polyphasic taxonomic approach. Cells were Gram-stain-negative, and catalase- and oxidase-positive. Strain TK008 T exhibited highest 16S rRNA gene sequence similarity of 97.1 % to Paracoccus pacificus F14 T . The phylogenetic trees based on 16S rRNA gene sequences showed that strain TK008 T was a member of the genus Paracoccus . Digital DNA-DNA hybridization values between strain TK008 T and two closely related species ( Paracoccus zhejiangensis and Paracoccus tegillarcae ) were 20.6 and 20.9 %. The average nucleotide identity values of strain TK008 T compared with P. zhejiangensis and P. tegillarcae were 75.2 and 74.6 % respectively. The major isoprenoid quinone was ubiquinone-10. The predominant fatty acids (>10 %) were summed feature 8 (C 18 : 1 ω6 c and/or C 18 : 1 ω7 c ). The polar lipids were diphosphatidylglycerol, phosphatidylglycerol, phosphatidylethanolamine, three unidentified phospholipids, two unidentified lipids and an unidentified glycolipid. The DNA G+C content of strain TK008 T from genomic sequence data was 62.54 mol%. On the basis of polyphasic analysis, strain TK008 T represents a novel species, for which the name Paracoccus aurantiacus sp. nov. is proposed. The type strain is TK008 T (=CGMCC 1.13898 T =JCM 33630 T ).