A bacterial strain, designated KBP-31T, was isolated from a water sample taken from the Banping Lake Wetland Park in Taiwan and characterized using a polyphasic taxonomic approach. Cells of strain KBP-31T were Gram-stain-negative, strictly aerobic, motile, light-yellow rods. Growth occurred at 10-37 �XC (optimum 25 �XC), at pH 6-8 (optimum pH 6) and with 0-1 % NaCl (w/v, optimum 0 %). Phylogenetic analyses based on 16S rRNA gene sequences showed that strain KBP-31T belonged to the genus Ideonella and was most closely related to Ideonella dechloratans ATCC 51718T with a sequence similarity of 98.2 %. Strain KBP-31T contained summed feature 3 (comprising C16 : 1�s7c and/or C16 : 1�s6c) and C16 : 0 as the predominant fatty acids. The major hydroxyl fatty acid was C10 : 0 3-OH. The polar lipid profile consisted of phosphatidylethanolamine, phosphatidylglycerol, diphosphatidylglycerol, an uncharacterized aminophospholipid and two uncharacterized phospholipids. The DNA G+C content of the genomic DNA was 67.9 mol%. The DNA-DNA relatedness of strain KBP-31T with respect to recognized species of the genus Ideonella was less than 70 %. On the basis of the phylogenetic inference and phenotypic data, strain KBP-31T should be classified as a novel species, for which the name Ideonella paludis sp. nov. is proposed. The type strain is KBP-31T (= BCRC 80524T = KCTC 32238T).