Abstract
A bacterium, designated HX2-24T, was isolated from activated sludge treating pesticide-manufacturing wastewater. Colonies of the strain on nutrient agar were circular, transparent, and colorless. Strain HX2-24T shared 98.1% 16S rRNA gene sequence similarity with Extensimonas vulgaris S4T, and less than 97% similarities with other type strains. Phylogenetic analysis based on 16S rRNA gene sequences revealed that the strain formed a clade with E. vulgaris S4T. The major cellular fatty acids were C16:0, summed feature 3 (C16:1ω7c and/or C16:1ω6c) and C17:0 cyclo, the major polar lipids were phosphatidylethanolamine (PE), phosphatidylglycerol (PG), diphosphatidylglycerol (DPG), aminophospholipid (APL), glycophospholipid (GPL), and aminoglycolipid (AGL). The average nucleotide identity (ANI) and digital DNA-DNA hybridization (dDDH) values between HX2-24T and E. vulgaris S4T were 92% and 41%, respectively. The G + C content of strain HX2-24T was 64.4mol%. Thus, based on the phenotypic, chemotaxonomic, and genotypic characteristics, strain HX2-24T represents a novel species in the genus Extensimonas, for which the name Extensimonas perlucida HX2-24T sp. nov. is proposed. The type strain is HX2-24T (= KCTC 72472T = CCTCC AB 2019178T).
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