Abstract
The current representatives of the family Natrialbaceae within the class Halobacteria were subjected to phylogenetic, phylogenomic, and comparative genomic analyses. The current species of Halobiforma and Halomontanus were found to be related to those of Natronobacterium and Natronoglomus, respectively. According to the cutoff value of average amino acid identity (AAI) (≤ 76%) proposed to differentiate genera within the family Natrialbaceae, Halobiforma, and Natronoglomus should be merged with Natronobacterium and Halomontanus, respectively. Beyond these, four novel halophilic archaeal strains, CCL63T, AD-5T, CG52T, and KLK7T, isolated from three saline lakes and a saline-alkaline land in China, were simultaneously subjected to polyphasic classification. The phenotypic, phylogenetic, phylogenomic, and comparative genomic analyses indicated that strain CCL63T (= CGMCC 1.18663T = JCM 35096T) represents a novel genus of the family Natrialbaceae, strains AD-5T (= CGMCC 1.13783T = JCM 33734T) and CG52T (= CGMCC 1.17139T = JCM 34160T) represent two novel species of the genus Natronococcus, and strain KLK7T (= MCCC 4K00128T = KCTC 4307T) represents a novel species of Haloterrigena. Halovalidus salilacus gen. nov., sp. nov., Natronococcus wangiae sp. nov., Natronococcus zhouii sp. nov., and Haloterrigena salinisoli sp. nov. are further proposed based on these type strains accordingly.
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