Alteromonas gilva sp. nov. and Erythrobacter fulvus sp. nov., isolated from a tidal mudflat

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 Erythro-bacter, 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 distinc-tion of the two strains from the genera Alteromonas and Erythrobacter, respectively, and we thus propose the names Alte-romonas 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).