RT Journal Article SR Electronic(1) A1 Wink, Joachim A1 Schumann, Peter A1 Atasayar, Ewelina A1 Klenk, Hans-Peter A1 Zaburannyi, Nestor A1 Westermann, Martin A1 Martin, Karin A1 Glaeser, Stefanie P A1 Kämpfer, PeterYR 2017 T1 ‘Streptomyces caelicus’, an antibiotic-producing species of the genus Streptomyces, and Streptomyces canchipurensis Li et al. 2015 are later heterotypic synonyms of Streptomyces muensis Ningthoujam et al. 2014 JF International Journal of Systematic and Evolutionary Microbiology, VO 67 IS 3 SP 548 OP 556 DO https://doi.org/10.1099/ijsem.0.001612 PB Microbiology Society, SN 1466-5034, AB ‘ Streptomyces caelicus ’ DSM 40835 was first reported as the producer of the antibiotic griselimycin by some coworkers of Rhone Poulenc in 1971. The project on isolation of the antibiotic compound was stopped because of the bad solubility and selectivity of the compound towards Mycobacteria. At Sanofi-Aventis, Germany, the project was re-evaluated in 2007 and the gene cluster of griselimycin could be identified, characterized and was patented in 2013. At this time, ‘ S. caelicus ’ was an invalid name. During the strain characterization work, it was found that ' S. caelicus ' belongs to the group of species of the genus Streptomyces which show an unusual heterogeneity of the 16S rRNA gene sequences. However, high 16S rRNA gene sequence similarities to Streptomyces muensis JCM 17576T and Streptomyces canchipurensis JCM 17575T were obvious. Here, we present a comparative description of ' Streptomyces caelicus ’ DS 9461 (=DSM 40835=NCCB 100592) with S. muensis and S. canchipurensis by use of a polyphasic taxonomy approach and additional comparison of some housekeeping genes by multilocus sequence analysis (MLSA). An emended description of Streptomyces muensis is provided as a result of this work., UL https://www.microbiologyresearch.org/content/journal/ijsem/10.1099/ijsem.0.001612