A bacterial strain, designated Sty a-1T, was isolated from a reef-building coral Stylophora sp., collected off coast of Southern Taiwan and characterized using the polyphasic taxonomy approach. Cells of strain Sty a-1T were Gram-staining-negative, aerobic, poly-�]-hydroxybutyrate accumulating, motile by means of flagella, non-spore forming, straight rod-shaped and colonies were yellow and circular. Growth occurred at 15-40 �XC (optimum, 30-35 �XC), at pH 6-10 (optimum, pH 6.5-8) and with 0-7% NaCl (optimum, 2-3%). The predominant fatty acids were iso-C15:0, iso-C17:1 �s9c, summed feature 3 (comprising C16:1 �s7c and/or C16:1 �s6c) and iso-C17:0. The major isoprenoid quinone was Q-8 and the DNA G+C content was 68.5 mol%. The polar lipid profile consisted of a mixture of phosphatidylethanolamine, phosphatidylglycerol, phosphatidylcholine, diphosphatidylglycerol, an uncharacterized aminophospholipid and three uncharacterized lipids. The major polyamines were spermidine, putrescine and homospermidine. Phylogenetic analyses based on 16S rRNA and four housekeeping gene sequences (recA, atpD, rpoA and rpoB) showed that strain Sty a-1T forms a distinct lineage with respect to closely related genera in the family Lysobacteraceae, most closely related to Lysobacter, Silanimonas, Arenimonas and Luteimonas and the levels of 16S rRNA gene sequence similarity with respect to the type species of related genera are less than 95%. On the basis of the genotypic and phenotypic data, strain Sty a-1T represents a novel genus and species of the family Lysobacteraceae, for which the name Coralloluteibacterium stylophorae gen. nov., sp. nov. is proposed. The type strain is Sty a-1T (= BCRC 80968T = LMG 29479T = KCTC 52167T).