A Gram-stain-negative, pink-pigmented, facultatively anaerobic, gliding and rod-shaped bacterium, showing optimum growth at 33°C, designated as strain H15T , was isolated from the gut microbial of the Acmaea from Weihai, Shandong Province, China and characterised phylogenetically, phenotypically and chemotaxonomically. Phylogenetic analysis based on 16S rRNA gene sequence comparisons revealed that the strain belonged to the family Rhodobacteraceae and was associated with members of the recognized genera, the closest relative was the type strain of Pseudaestuariivita atlantica (96.7%). Genome analysis showed that the genome size was 3893398 bp and the DNA G+C content obtained from the draft genome sequence was 56.7%. The secondary metabolites based on genome predicated that the strain H15T contained one cluster of lassopeptide, one cluster of bacteriocin, two clusters of terpene production, two clusters of homoserine lactone(Hserlactone)production and one cluster of beta lactone. The average amino acid identity, average nucleotide identity and digital DNA–DNA hybridization values between genome sequences of strain H15T and all the type strains of the recognized taxa compared were lower than 63.1,72.0 and 19.7%, respectively. Based on the analysis of chemical components, the predominant cellular fatty acids were summed featured 8(C18:1ω7c/ω6c,46.1%), C 20:1ω7c (17.1%), the major polar lipids contained phosphatidylcholine, phosphatidylglycerol, phosphatidylethanolamine and an unidentified lipid and the predominant menaquinone was Q10. Therefore, the combined chemotaxonomic, phenotypic and phylogenetic data indicated that the strain was considered to represent a novel species of the genus Pseudaestuariivita and the name Pseudaestuariivita rosea sp. nov. was proposed for strain H15T(MCCC 1K04420T=KCTC 82505T).