Aurantiacibacter sediminis sp. nov., a marine bacterium isolated from a tidal flat

A yellow-coloured bacterium, designated as strain JGD-13^T, was isolated from a tidal flat in the Republic of Korea. Cells were Gram-stain-negative, aerobic, non-flagellated and rod-shaped. Growth was observed at 4-42 °C (optimum, 30 °C), at pH 6.0-12.0 (pH 7.0-8.0) and at 1-7 % (w/v) NaCl concentration (3 %). The 16S rRNA gene sequence analysis indicated that strain JGD-13^T was closely related to Aurantiacibacter gangjinensis K7-2^T with a sequence similarity of 98.2 %, followed by Aurantiacibacter aquimixticola JSSK-14^T (98.1 %), Aurantiacibacter atlanticus s21-N3^T (97.6 %), Aurantiacibacter zhengii V18^T (97.6 %) and Aurantiacibacter luteus KA37^T (97.5 %). The average nucleotide identity and digital DNA-DNA hybridization values with related strains were 70.3-76.2 % and 18.5-20.3 %. The genomic DNA G+C content was 60.2 mol%. Phylogenetic analysis using the maximum-likelihood method showed that strain JGD-13^T formed a clade with A. aquimixticola JSSK-14^T and A. gangjinensis K7-2^T. The major fatty acids were summed feature 8 (39.7 %) and C_17 : 1  ω6c (14.4 %). The predominant respiratory quinone was ubiquinone-10. The polar lipids were phosphatidylethanolamine, phosphatidylglycerol, phosphatidylcholine, one sphingoglycolipid and three unidentified lipids. On the basis of phylogenetic, phenotypic and chemotaxonomic characteristics, strain JGD-13^T represents a novel species within the genus Aurantiacibacter, for which the name Aurantiacibacter sediminis JGD-13^Tsp. nov. is proposed. The type strain is JGD-13^T (=KCTC 72892^T=KACC 21676^T=JCM 33995^T).