A Gram-negative, aerobic, motile and short-rod-shaped bacterium, designated strain 5T4P-12-1(T), was isolated from a piece of surface-sterilized bark of Aegiceras corniculatum collected from Cotai Ecological Zones in Macao, China and tested by a polyphasic approach to clarify its taxonomic position. Strain 5T4P-12-1(T) grew optimally with 0-1% (w/v) NaCl at 30 degrees C and at pH 7.0-8.0. The 16S rRNA gene sequence of strain 5T4P-12-1(T) had the highest similarity (96.7 %) to Aureimonas altamirensis DSM 21988(T). Phylogenic analysis based on 16S rRNA gene sequences and coding sequences of 98 protein clusters showed that the strain represented a novel genus of the family Aurantimonadaceae. The predominant quinone system of strain 5T4P12-1(T) was ubiquinone 10. The polar lipid profile contained diphosphatidylglycerol, phosphatidylglycerol, phosphatidylcholine, phosphatidylethanolamine, phosphatidylmethylethanolamine, an unidentified aminophospholipid, three unidentified aminolipids, three unidentified phospholipids and three unidentified lipids. The major fatty acids (> 10% of total fatty acids) were C-18 : 1 omega 7c (55.4 %) and C-18 : 1 2-OH (15.6 %). The DNA G+C content of strain 5T4P-12-1(T) was 66.5 mol%. Based on the phylogenic, phenotypic and chemotaxonomic features, strain 5T4P-12-1(T) is considered to represent a novel species of a new genus in the family Aurantimonadaceae, for which the name Mangrovicella endophytica gen. nov., sp. nov. is proposed. The type strain is 5T4P-12-1(T) (=KCTC 62053(T) =CGMCC 1.16279(T)).