RT Journal Article SR Electronic(1) A1 Afonso de Menezes, Cláudia Beatriz A1 Afonso, Rafael Sanches A1 Souza, Wallace Rafael de A1 Parma, Márcia A1 Melo, Itamar Soares de A1 Zucchi, Tiago Domingues A1 Fantinatti-Garboggini, FabianaYR 2017 T1 Williamsia spongiae sp. nov., an actinomycete isolated from the marine sponge Amphimedon viridis JF International Journal of Systematic and Evolutionary Microbiology, VO 67 IS 5 SP 1260 OP 1265 DO https://doi.org/10.1099/ijsem.0.001796 PB Microbiology Society, SN 1466-5034, AB A novel actinobacterium, designated isolate B138T, was isolated from the marine sponge, Amphimedon viridis, which was collected from Praia Guaecá (São Paulo, Brazil), and its taxonomic position was established using data from a polyphasic study. The organism showed a combination of chemotaxonomic and morphological characteristics consistent with its classification in the genus   Williamsia   and it formed a distinct phyletic line in the Williamsia 16S rRNA gene tree. It was most closely related to   Williamsia serinedens   DSM 45037T and   Williamsia deligens   DSM 44902T (99.0 % 16S rRNA gene sequence similarity) and   Williamsia maris   DSM 44693T (97.5 % 16S rRNA gene sequence similarity), but was distinguished readily from these strains by the low DNA–DNA relatedness values (62.3–64.4 %) and by the discriminatory phenotypic properties. Based on the data obtained, the isolate B138T (=CBMAI 1094T=DSM 46676T) should be classified as the type strain of a novel species of the genus   Williamsia  , for which the name Williamsia spongiae sp. nov. is proposed., UL https://www.microbiologyresearch.org/content/journal/ijsem/10.1099/ijsem.0.001796