The genus Leptospira currently comprises 16 named species. In addition, four unnamed hybridization groups were designated Leptospira genomospecies 1, 3, 4 and 5. These groups represent valid species-level taxa, but were not assigned names in the original description by Brenner et al. [Int J Syst Bacteriol 49, 839–858 (1999)]. To rectify this situation, it is proposed that Leptospira genomospecies 1, genomospecies 3, genomospecies 4 and genomospecies 5 should be classified as Leptospira alstonii sp. nov., Leptospira vanthielii sp. nov., Leptospira terpstrae sp. nov. and Leptospira yanagawae sp. nov., respectively, with strains L. alstonii 79601T ( = ATCC BAA-2439T), L. vanthielii WaZ HollandT ( = ATCC 700522T), L. terpstrae LT 11-33T ( = ATCC 700639T) and L. yanagawae Sao PauloT ( = ATCC 700523T) as the type strains. The type strains are also available from the culture collections of the WHO Collaborating Centres in Amsterdam, The Netherlands, and Brisbane, Australia.
A Gram-negative, rod-shaped, aerobic bacterial strain, designated EBTL01T, was isolated from activated sludge by using metabolites of microalgae Ankistrodesmus gracilis SAG278-2. Phylogenetic analyses based on 16S rRNA gene sequence showed that strain EBTL01T belongs to the family Verrucomicrobiaceae , class Verrucomicrobiae , and is related most closely to Luteolibacter pohnpeiensis A4T-83T (95.5 % sequence similarity) and Luteolibacter algae A5J-41-2T (95.2 %). The G+C content of the genomic DNA of strain EBTL01T was 56.3 mol% and the menaquinone MK-9 was detected as the predominant quinone. Major fatty acid components were iso-C14 : 0, C16 : 1ω7c and C16 : 0. The amino acids of the cell-wall peptidoglycan contained muramic acid and meso-diaminopimelic acid. These profile results supported the affiliation of strain EBTL01T to the genus Luteolibacter . On the other hand, based on chemotaxonomic properties and phenotypic characteristics, strain EBTL01T could be clearly differentiated from its phylogenetic neighbours. Therefore, strain EBTL01T represents a novel species of the genus Luteolibacter , for which the name Luteolibacter yonseiensis sp. nov. is proposed. The type strain is EBTL01T ( = KCTC 23678T = JCM 18052T).