gen. nov. sp. nov., a novel bacterium isolated from sediment in the Pearl River Estuary and reclassification of five and four species.

An aerobic, Gram-negative, non-motile, yellow-to-orange pigmented and round bacterium, designated strain SCSIO 72103, was isolated from sediment collected in the Pearl River Estuary, Guangdong Province, PR China and subjected to a polyphasic taxonomic study. Growth occurred at 20-37 °C (optimum, 28 °C), pH 6-8 (optimum, pH 7) and with 1-5.5% NaCl (optimum, 1-3 %). Comparative 16S rRNA gene analysis indicated that strain SCSIO 72103 had the highest similarities to SNL9 (94.7 %) and SW105 (94.2 %). Phylogenetic analysis based 16S rRNA gene sequences showed that strain SCSIO 72103 formed a single clade with SW105. Strain SCSIO 72103 contained iso-C as the major fatty acid and the predominant respiratory quinone was menaquinone MK-6. These characteristics are consistent with those of SNL9 and SW105. Phosphatidylethanolamine, most notably, unidentified aminolipid and unidentified aminophospholipid were major polar lipids. Strain SCSIO 72103 had a single circular chromosome of 2.96 Mb with a DNA G+C content of 35.1 mol%. The average nucleotide identity, average amino acid identity (AAI) and digital DNA-DNA hybridization values showed that the pairwise similarities between SCSIO 72103 and the type strains of SNL9 and SW105 were 78.5-80.5 %, 79.0-81.4 % and 22.7-22.8 %, respectively. The AAI values between species in this clade and the type species of and were below the 65 % threshold, indicating that these species belong to a novel genus. On the basis of phylogenetic, physiological and chemotaxonomic characteristics, strain SCSIO 72103 represents a new species of a novel genus, for which the name gen. nov. sp. nov. is proposed. The type strain is SCSIO 72103 (=KCTC 92043=MCCC 1K06659). It is also proposed that nine known species in the genera and are reclassified as species.