ABSTRACT
A yellow, Gram-stain-negative, aerobic, and rod-shaped strain, designated as C18T, was isolated from seawater in the tidal region of Taizhou. Growth of strain C18T occurs at 20-45 °C, at pH 5.5-8.0 and with 1.0-8.0% (w/v) NaCl. The 16S rRNA gene sequence analysis showed that strain C18T shared sequence identities with the genera Erythrobacter (< 98.4%), Qipengyuania (< 98.0%), Altererythrobacter (< 96.4%), Parerythrobacter (< 96.2%), Aurantiacibacter (< 96.2%), Tsuneonella (< 96.0%), Pelagerythrobacter (< 96.0%), Alteriqipengyuania (< 95.9%), and Parapontixanthobacter (< 95.7%) type strains. While the phylogenomic tree based on single-copy orthologous clusters revealed that strain C18T was stably clustered into the genus Parerythrobacter. Average nucleotide identity and digital DNA-DNA hybridization values of strain C18T and Parerythrobacter type strains were 73.5-75.2% and 18.5-19.4%, respectively, which were lower than the species delineation thresholds. The sole respiratory quinones were identified as ubiquinone-10. The major fatty acids (> 10%) were C17:1ω6c and summed feature 8 (C18:1ω7c and/or C18:1ω6c). Polar lipids included diphosphatidylglycerol, phosphatidylethanolamine, phosphatidylglycerol, sphingoglycolipid, an unidentified phospholipid, and an unidentified aminophospholipid. Based on the genetic, chemotaxonomic and phenotypic results, strain C18T is concluded to represent a novel species in the genus Parerythrobacter, for which the name Parerythrobacter aestuarii sp. nov. is proposed. The type strain is C18T (= KCTC 82594T = MCCC 1K05109T).
