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A novel Gram-stain-negative, facultatively anaerobic, and non-motile bacterial strain, designated SDUM287046^T, was isolated from the coastal sediments of Jingzi Port of Weihai, China. Cells of strain SDUM287046^T were rod-shaped with widths of 0.4–0.5 μm and lengths of 0.7–1.4 μm and could produce flexirubin-type pigments. Optimum growth of strain SDUM287046^T occurred at 33–35 °C, pH 7.0, and with 2% (<i>w</i>/<i>v</i>) NaCl. Oxidase activity was negative, but catalase activity was positive. Phylogenetic analysis based on 16S rRNA gene sequence revealed that strain SDUM287046^T was most closely related to <i>Aequorivita aquimaris</i> D-24^T (98.3%). The main cellular fatty acids were iso-C_15:0, anteiso-C_15:0, iso-C_17:0 3–OH, and summed feature 9 (comprised of iso-C_17:1 ω9c and/or C_16:0 10-methyl). The sole respiratory quinone was MK-6. The polar lipids consisted of phosphatidylethanolamine (PE), one aminolipid (AL), three unidentified glycolipids (GL), and three unidentified lipids (L). The DNA G + C content was 39.3 mol%. According to the integrated results of phylogenetic, physiological, biochemical, and chemotaxonomic characteristics, we propose that strain SDUM287046^T represents a novel species of the genus <i>Aequorivita</i>, for which the name <i>Aequorivita aurantiaca</i> sp. nov. is proposed. The type strain is SDUM287046^T (=KCTC 92754^T = MCCC 1H01418^T). Comparative genomic analysis showed that the 16 <i>Aequorivita</i> species shared 1453 core genes and differed mainly in amino acid metabolism, cofactor metabolism, and vitamin metabolism. Biogeographic distribution analysis indicated that the marine environments were the primary habitat of <i>Aequorivita</i> bacteria.