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A Gram-positive to Gram-variable, motile and coccoid- or short rod-shaped bacterial strain, ISL-41T, was subjected to a polyphasic study to investigate its exact taxonomic position. Strain ISL-41T grew optimally at pH 7.0–8.0 and 30 °C. It contained MK-8 and MK-7 as the predominant menaquinones and anteiso-C15 : 0, iso-C16 : 0, anteiso-C17 : 0 and C16 : 1 ω7c alcohol as the major fatty acids. The DNA G+C content was 45.9 mol%. A phylogenetic analysis based on 16S rRNA gene sequences showed that strain ISL-41T belonged to the genus Planomicrobium. The levels of similarity between the 16S rRNA gene sequence of strain ISL-41T and those of the type strains of recognized Planomicrobium species and Planococcus stackebrandtii were 97.4–98.6 %. Mean DNA–DNA relatedness values between strain ISL-41T and the type strains of Planomicrobium species and Planococcus stackebrandtii were 13–25 %. Differential phenotypic properties, together with the phylogenetic and genetic distinctiveness, showed that strain ISL-41T could be differentiated from recognized Planomicrobium species and Planococcus stackebrandtii. On the basis of the phenotypic, phylogenetic and genetic data, strain ISL-41T is considered to represent a novel species within the genus Planomicrobium, for which the name Planomicrobium flavidum sp. nov. is proposed. The type strain is ISL-41T (=KCTC 13261T=CCUG 56756T). It is also proposed that Planococcus stackebrandtii be transferred to the genus Planomicrobium as Planomicrobium stackebrandtii comb. nov. (type strain K22-03T=MTCC 6226T=DSM 16419T=JCM 12481T).
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