RT Journal Article SR Electronic(1) A1 Kim, Bongcheol A1 Sahin, Nevzat A1 Minnikin, David E. A1 Zakrzewska-Czerwinska, Jolanta A1 Mordarski, Marian A1 Goodfellow, MichaelYR 1999 T1 Classification of thermophilic streptomycetes, including the description of Streptomyces thermoalcalitolerans sp. nov. JF International Journal of Systematic and Evolutionary Microbiology, VO 49 IS 1 SP 7 OP 17 DO https://doi.org/10.1099/00207713-49-1-7 PB Microbiology Society, SN 1466-5034, AB A polyphasic taxonomic study was undertaken to clarify relationships within and between representative thermophilic alkalitolerant streptomycetes isolated from soil and appropriate marker strains. The resultant data, notably those from DNA–DNA relatedness studies, support the taxonomic integrity of the validly described species Streptomyces thermodiastaticus, Streptomyces thermoviolaceus and Streptomyces thermovulgaris. However, the genotypic and phenotypic data clearly show that Streptomyces thermonitrificans Desai and Dhala 1967 and S. thermovulgaris ( Henssen 1957 ) Goodfellow et al. 1987 represent a single species. On the basis of priority, S. thermonitrificans is a later subjective synonym of S. thermovulgaris. Similarly, 10 out of the 11 representative thermophilic alkalitolerant isolates had a combination of properties consistent with their classification as S. thermovulgaris. The remaining thermophilic alkalitolerant isolate, Streptomyces strain TA56, merited species status. The name Streptomyces thermoalcalitolerans sp. nov. is proposed for this strain. A neutrophilic thermophilic isolate, Streptomyces strain NAR85, was identified as S. thermodiastaticus., UL https://www.microbiologyresearch.org/content/journal/ijsem/10.1099/00207713-49-1-7