Strain XY-J91, a Gram-stain-negative, reddish orange, non-spore-forming and short-rod-shaped marine bacterium, was isolated from rhizosphere soil of the mangrove plant (L.) Druce in Mai Po Nature Reserve, Hong Kong. The strain showed growth at 15-50 °C (optimum 40 °C), at pH 5.5-9.5 (optimum 7.0-8.0) and with 0-8 % (w/v) NaCl (optimum 1-2 %). The only respiratory quinone was MK-7 and the major fatty acids were iso-C and iso-C 3-OH. The major polar lipids were phosphatidylethanolamine, an unidentified aminolipid and an unidentified phospholipid. The G+C content of strain XY-J91 was 40.4 mol%. Strain XY-J91 exhibited highest 16S rRNA gene sequence similarities to the type strains of SW-2 (96.66 %), CC-PR-82 (96.21%), JC2052 (96.16%), HJM-2 (95.73%) and 12C11 (95.52 %). Based on the phylogenetic, phenotypic and chemotaxonomic evidence presented, strain XY-J91 represents a novel species of the genus , for which the name sp. nov. is proposed. The type strain is XY-J91 (=MCCC 1K03612=KCTC 72216).
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