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The Gram-negative marine bacterium GXY010^T, which has been isolated from the surface seawater of the western Pacific Ocean, is aerobic, non-motile and non-flagellated. Strain GXY010^T exhibits growth across a temperature range of 10–42 °C (optimal at 37 °C), pH tolerance from 7.0 to 11.0 (optimal at 7.5) and a NaCl concentration ranging from 1.0 to 15.0% (w/v, optimal at 5.0%). Ubiquinone-8 (Q-8) was the predominant isoprenoid quinone in strain GXY010^T. The dominant fatty acids (>10%) of strain GXY010^T were iso-C_15:0 (14.65%), summed feature 9 (iso-C_17:1 ω9c and/or 10-methyl C_16:0) (12.41%), iso-C_17:0 (10.85%) and summed feature 3 (C_16:1 ω7c and/or C_16:1 ω6c) (10.41%). Phosphatidylethanolamine (PE), phosphatidylglycerol (PG), diphosphatidylglycerol (DPG), unidentifiable glycolipid (GL) and four non-identifiable aminolipids (AL1-AL4) were the predominant polar lipids of strain GXY010^T. The genomic DNA G+C content was identified as a result of 48.0% for strain GXY010^T. The strain GXY010^T genome consisted of 2,766,857 bp, with 2664 Open Reading Frames (ORFs), including 2586 Coding sequences (CDSs) and 78 RNAs. Strain GXY010^T showed Average Nucleotide Identity (ANI) values of 73.4% and 70.6% and DNA–DNA hybridization (DDH) values of 19.2% and 14.5% with reference species Pseudidiomarina tainanensis MCCC 1A02633^T (=PIN1^T) and Pseudidiomarina taiwanensis MCCC 1A00163^T (=PIT1^T). From the results of the polyphasic analysis, a newly named species, Pseudidiomarina fusca sp. nov. within the genus Pseudidiomarina, was proposed. The type strain of Pseudidiomarina fusca is GXY010^T (=JCM 35760^T = MCCC M28199^T = KCTC 92693^T). Full article