Amycolatopsis nigrescens sp. nov., an actinomycete isolated from a Roman catacomb Groth, Ingrid and Tan, Geok Yuan Annie and González, Juan M. and Laiz, Leonila and Carlsohn, Marc René and Schütze, Barbara and Wink, Joachim and Goodfellow, Michael,, 57, 513-519 (2007), doi = https://doi.org/10.1099/ijs.0.64602-0, publicationName = Microbiology Society, issn = 1466-5026, abstract= The taxonomic status of two actinomycetes isolated from the wall of a hypogean Roman catacomb was established based on a polyphasic investigation. The organisms were found to have chemical and morphological markers typical of members of the genus Amycolatopsis. They also shared a range of chemical, molecular and phenotypic markers which served to separate them from representatives of recognized Amycolatopsis species. The new isolates formed a branch in the Amycolatopsis 16S rRNA gene sequence tree with Amycolatopsis minnesotensis NRRL B-24435T, but this association was not supported by a particularly high bootstrap value or by the product of the maximum-parsimony tree-making algorithm. The organisms were distinguished readily from closely related Amycolatopsis species based on a combination of phenotypic properties and from all Amycolatopsis strains by their characteristic menaquinone profiles, in which tetra-hydrogenated menaquinones with 11 isoprene units predominated. The combined genotypic and phenotypic data indicate that the isolates merit recognition as representing a novel species of the genus Amycolatopsis. The name proposed for this novel species is Amycolatopsis nigrescens sp. nov., with type strain CSC17Ta-90T (=HKI 0330T=DSM 44992T=NRRL B-24473T)., language=, type=