A strictly aerobic, Gram-stain-negative, gliding, rod-shaped bacteria, designated strain S481T, was isolated from a surface seawater sample collected at Gunsan marina, in the West Sea of the Republic of Korea. Phylogenetic analysis based on 16S rRNA gene sequences revealed that strain S481T formed a monophyletic clade with members of the genus Fulvivirga , showing 93.7–95.8% sequence similarity to the type strains. Strain S481T has a single circular chromosome of 4.13 Mbp with a DNA G+C content of 37.3 mol%. The values of average nucleotide identity, average amino acid identity and digital DNA–DNA hybridization between strain S481T and all genome-sequenced species of the genus Fulvivirga were below 71.2%, 68.6% and 18.9%, respectively, indicating lower values than the standard cut-offs for species delineation. Growth was observed at 20–42 °C (optimum, 37 °C), at pH 6–8 (optimum, pH 7) and with 0 – 6 % NaCl (optimum, 1–2 %). The major fatty acids (>10%) were iso-C15:0, iso-C15:1 G and C16:1ω5c. The respiratory quinone was MK-7. The major polar lipids were identified as phosphatidylethanolamine, three unidentified aminolipids and five unidentified lipids. Based on the results of phenotypic characterization, phylogenetic analysis and genome-based comparison, strain S481T represents a novel species in the genus Fulvivirga , for which we propose the name Fulvivirga lutea sp. nov. The type strain is S481T (=KCTC 82209T=JCM 34505T).

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A Gram-stain-negative, motile, facultative anaerobic rod-shaped marine bacterium, designated strain D4-2T, was isolated from a sample of seawater collected at Dong-do marina, Dokdo Island, in the East Sea of the Republic of Korea. Phylogenetic analysis based on the 16S rRNA gene sequences revealed that strain D4-2T was affiliated with members of genus Shewanella and closely related to Shewanella intestini XMDDZSB0408T (97.4%), followed by Shewanella gelidii RZB5-4T (96.7 %) and Shewanella inventionis KX27T (96.1 %). D4-2T has a single circular chromosome of 4.72 Mbp with a DNA G+C content of 44.5 mol%. Average nucleotide identity (ANI) and in silico DNA–DNA hybridization (DDH) values between strain D4-2T and the previously mentioned type strains of species of the genus Shewanella were in range of 69–83.8 % and 20.5–21.7 %, respectively. Growth was observed at 10–36 °C (optimum 29–32 °C), at pH 6–9 (optimum pH 7), and with 1–6% NaCl (optimum 2%). The predominant fatty acids (>10 %) of D4-2T were iso-C15:0 and summed feature 3 (C16:1ω7c and/or C16:1ω6c). The respiratory quinones were Q-7, Q-8, MK-7 and MMK-7. Phosphatidylethanolamine, phosphatidylglycerol, an unidentified aminophospholipid, an unidentified aminolipid and four unidentified lipids were detected in D4-2T. On the basis of phenotypic, chemotaxonomic and molecular properties, D4-2T represents a novel species of the genus Shewanella , for which the name Shewanella maritima sp. nov. is proposed with D4-2T as the type strain (=KCTC 72040T=JCM 33294T).

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