A Gram-staining-positive bacterium, designated AS-0823(T), which formed spiral spore chains on the aerial mycelium, was isolated from the intestinal tract of Armadillidium vulgare, a small terrestrial crustacean commonly found on the ground around houses in Japan. 16S rRNA gene sequence analysis showed that the isolate belonged to the genus Streptomyces and was most closely related to Streptomyces longisporus ISP 5166(T) (98.6 % 16S rRNA gene sequence similarity), Streptomyces curacoi NBRC 12761(T) (98.4 %) and Streptomyces griseoruber NBRC 12873(T) (98.4 %). The affiliation of strain AS-0823(T) to the genus Streptomyces was supported by chemotaxonomic data: iso-C(16 : 0), anteiso-C(15 : 0), C(16 : 0), iso-C(15 : 0) and anteiso-C(17 : 0) as the major cellular fatty acids, ll-diaminopimelic acid as the characteristic diamino acid in the peptidoglycan and the absence of mycolic acids. DNA-DNA hybridization and physiological and biochemical analysis supported the differentiation of strain AS-0823(T) from S. longisporus JCM 4395(T). Therefore, strain AS-0823(T) represents a novel species, for which the name Streptomyces coacervatus sp. nov. is proposed. The type strain is AS-0823(T) ( = IFM 11055(T) = DSM 41983(T) = JCM 17138(T)).