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An aerobic, Gram-stain-negative, rod-shaped bacterial isolate, strain NH36AT, was isolated from a sandy sediment sample from the South China Sea. Colonies of the isolate were dark orange on M2 agar. Optimal growth was observed at pH 7.0–8.5, 30 °C and in the presence of 0.5–4.0 % (w/v) NaCl. The major fatty acids were C15 : 0, iso-C15 : 0, anteiso-C15 : 0, iso-C15 : 1, iso-C15 : 0 3-OH, iso-C17 : 0 3-OH and summed feature 3 (comprising iso-C15 : 0 2-OH and/or C16 : 1 ω7c). The DNA G+C content was 38.9 mol%. 16S rRNA gene sequence analysis revealed that strain NH36AT was most closely related to members of the genus Arenibacter, exhibiting 94.3–96.2 % sequence similarity to the type strains of Arenibacter species. On the basis of phenotypic, chemotaxonomic and phylogenetic data, this organism should be classified as a representative of a novel species in the genus Arenibacter. The name Arenibacter nanhaiticus sp. nov. is proposed and the type strain is NH36AT (=LMG 24842T=CCTCC AB 208315T=MCCC 1A04137T).
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