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Strains chi3 T and sf7 T were collected from a tidal mudflat around Dongmak beach in Ganghwa, Republic of Korea. Both strains were Gram-stain-negative, aerobic or facultatively anaerobic, and rod-shaped. Results of phylogenetic tree analysis based on 16S rRNA and whole-genome sequences suggested that strains chi3 T and sf7 T belong to the genera Alteromonas and Erythrobacter , respectively. The cells of strain chi3 T were non-motile and grew at 15–45 °C (optimum, 38 °C), at pH 6.0–10.0 (optimum, pH 8.0) and in the presence of 0–9.0 % (w/v) NaCl (optimum, 2.0 %). The cells of strain sf7 T were motile as they had flagella and grew at 20–48 °C (optimum, 38 °C), at pH 6.0–10.0 (optimum, pH 9.0) and in the presence of 0–5.0 % (w/v) NaCl (optimum, 1.0 %). Strains chi3 T and sf7 T have average nucleotide identity values (70.0–70.4% and 78.9–81.7 %) and digital DNA–DNA hybridization values (21.8–22.3% and 21.0–25.6 %) with reference strains in the genera Alteromonas and Erythrobacter , respectively. Data from digital DNA–DNA hybridization, as well as phylogenetic, biochemical and physiological analyses, indicated the distinction of the two strains from the genera Alteromonas and Erythrobacter , respectively, and we thus propose the names Alteromonas gilva sp. nov. (type strain chi3 T =KACC 22866 T =TBRC 16612 T ) and Erythrobacter fulvus sp. nov. (type strain sf7 T =KACC 22865 T =TBRC 16611 T ).
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