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A taxonomic study was carried out on strain 13D2W-2T,which was isolated from a sulphur-oxidizing bacterial consortium,enriched by the deep-sea sediment of the Atlantic Ocean.The isolate was observed to be Gram-negative,oxidase-and catalase-positive,short-rod-shapedand motileby means of a flagellum.Growth was observed at salinities from 0.5 to 12%and at temperatures from 4 to 41 ℃,and the strain found to be able to reduce nitrate but not degrade gelatin.Phylogenetic analysis based on 16S rRNA gene sequences indicated that strain 13D2W-2T belongs to the genus Thioclava,with highest sequence similarity of 97.8%to ThioclavadalianensisDLFJ1-1T,followed byThioclavapacificaTL 2T (97.7%),while the sequence similarities to other members of the genus were all below 97.0%.The DNA-DNA hybridization estimated valuesbetween strain 13D2W-2Tand T.dalianensisDLFJ1-1T and T.pacificaTL 2T were 22.6±2.4%and 25.6±2.4%,respectively.The ANI values between strain 13D2W-2Tand T.dalianensisDLFJ1-1T and T.pacificaTL 2Twere78.49%and 81.91%respectively.The principal fatty acid identified was Summed Feature 8 (C18:1ω7c/ω6c) (74.38%).The major quinone of strain 13D2W-2T was identified as Q10 (100%).The major polar lipids of strain 13D2W-2T were found to be comprised of phosphatidylethanolamine,phosphatidylglycerol,an aminophospholipid,a glycolipid and three unknown phospholipids.The G+C content of the chromosomal DNA was determined to be 65.3 mol%.The combined genotypic and phenotypic data show that strain 13D2W-2T represents a novel species of the genus Thioclava,for which the name Thioclavaatlanticasp.nov.is proposed,with the type strain 13D2W-2T (=MCCC 1A02612T =LMG 27145T).