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A Gram-negative,non-motile,rod-shaped,aerobic bacterium,designated strain YLT18T,was isolated from mountain cliff soil of Enshi Grand Canyon in China.The major menaquinone wasmenaquinone 7(MK-7)and the predominant fatty acids(> 5%)were iso-C15 : 0,C16: 1ω5c,iso-C17:0 3-OH,summed feature 3(C16: 1ω7c/iso-C15:0 2-OH)and iso-C15 : 0 3-OH.The major polar lipids were phosphatidylethanolarnine,two unknown amino-phospholipids,two unknown aminolipids and two unknown polar lipids.The DNA G+C content was 55.4 mol%.According to phylogenetic analysis based on the 16S rRNA gene sequences,strain YLT18T was most closely related to Chitinophaga niabensis JS13-10T and Chitinophaga cymbidii R156-2T,with 16S rRNA gene sequence similarities of 96.7%and 96.2%,respectively.In addition,strain YLT18r showed obvious differences from the closely related species in activities of esterase(C4),acid production of fructose,rhamnose,sole carbon sources utilization by arabinose and rhamnose.The polyphasic taxonomic results revealed that strain YLT18T represents a novel species of the genus Chitinophaga,for which the name Chitinophaga barathrisp.nov.is proposed.The type strain is YLT18T(=KCTC 42472T=CCTCC AB 2015054T).