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Polyphasic taxonomic analysis was performed to characterize a novel bacterium, which was isolated from surface sediment of the Terra Nova Bay, Antarctica, and designated as R04H25 T . The cells of the isolate were Gram-stain-negative, aerobic, non-motile, slightly curved rods. Growth occurred at 4-42 °C, pH 7.0-9.5, and in 1-15 % (w/v) NaCl. Phylogenetic trees based on 16S rRNA gene sequences indicated that strain R04H25 T formed an independent lineage within the genus Pseudidiomarina and its nearest neighbours were Pseudidiomarina donghaiensis 908033 T (98.2 %), Pseudidiomarina marina PIM1 T (98.1 %), Pseudidiomarina woesei W11 T (97.8 %), Pseudidiomarina maritima 908087 T (97.1 %) and Pseudidiomarina tainanensis PIN1 T (97.0 %). The average nucleotide identities between strain R04H25 T and the nearest neighbours were 76.2-77.7 %. The major fatty acids were iso-C 17 : 0 , summed feature 9, iso-C 15 : 0 , C 16 : 0 and iso-C 11 : 0 3-OH. The polar lipids comprised phosphatidylethanolamine, phosphatidylglycerol, diphosphatidylglycerol, an unidentified aminophospholipid, three unidentified glycolipids and two unidentified lipids. The predominant respiratory quinone was ubiquinone 8. The genomic DNA G+C content was 48.2 mol%. On the basis of the phylogenetic, physiological and chemotaxonomic results, we propose a novel species named as Pseudidiomarina gelatinasegens sp. nov. in the genus Pseudidiomarina , with the type strain R04H25 T (=GDMCC 1.1503 T =KCTC 62911 T ).