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A Gram-stain-negative, facultatively anaerobic, moderately halophilic, filamentous, non-motile bacterium, designated FA102T, was isolated from marine sediment from the coast of Weihai, PR China. Phylogenetic analysis based on 16S rRNA gene sequences showed that strain FA102T formed a distinct evolutionary lineage within the family Marinifilaceae and its closest relative was Marinifilum fragile JCM 15579T (93.2 % sequence similarity). The DNA G+C content of the novel strain was 36.5 mol%. The predominant cellular fatty acids and respiratory quinone were iso-C15 : 0 and iso-C15 : 0 3-OH, and MK-7, respectively. On the basis of the phylogenetic, phenotypic and physiological data, strain FA102T represents a novel genus and species, for which the name Ancylomarina subtilis gen. nov., sp. nov. is proposed. The type strain of Ancylomarina subtilis is FA102T (=KCTC 42257T=DSM 28825T=CICC 10902T). Furthermore, a new order named Marinilabiliales is proposed to accommodate three families previously classified in the order Bacteroidales . Marinilabiliales ord. nov. encompasses the families Marinilabiliaceae , Prolixibacteraceae and Marinifilaceae.
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