The taxonomic position of an actinomycete, designated strain IMMIB L-21 T , was determined using a polyphasic taxonomic approach. The organism, which had phenotypic properties consistent with its classification in the genus Nocardiopsis, formed a distinct clade in the 16S rRNA gene sequence tree together with the type strain of Nocardiopsis composta, but was readily distinguished from this species using DNA-DNA relatedness and phenotypic data. The genotypic and phenotypic data show that the organism represents a novel species of the genus Nocardiopsis, for which the name Nocardiopsis potens sp. nov. is proposed. The type strain is IMMIB L-21 T (5DSM 45234 T 5CCUG 56587 T ).The genus Nocardiopsis was proposed by Meyer (1976) on the basis of chemotaxonomic and morphological characteristics. At the time of writing, the taxon encompasses 28 recognized species and 4 subspecies, which form a distinct clade within the evolutionary radiation occupied by members of the family Nocardiopsaceae (Rainey et al., 1996). Nocardiopsis strains are frequently isolated from saline soils (Yassin et al., 1993a;Li et al., , 2006, but they have also been recovered from an alkaline slag dump (Schippers et al., 2002), indoor environments (Peltola et al., 2001), the atmosphere of a composting facility (Kämpfer et al., 2002) and clinical material (Bernatchez & Lebreux, 1991;Yassin et al., 1997). In the present polyphasic study, an actinomycete isolated from household waste was shown to represent a novel species of the genus Nocardiopsis.Strain IMMIB L-21 T was isolated from a household dustbin on Brain Heart Infusion (BHI; BD) agar, glucose-yeast extract-malt extract agar (GYM; medium 65; DSMZ) and Columbia agar (BD) supplemented with 5 % sheep blood. The organism was grown on yeast extract-malt extract agar (ISP 2), oatmeal agar (ISP 3) and inorganic salts-starch agar (ISP 4) as described by Shirling & Gottlieb (1966) and examined for pigmentation and colour of aerial and substrate mycelia. Gram and ZiehlNeelsen stains were applied to hyphae grown on Columbia agar. Growth at different temperatures was determined at 10, 20, 27, 37 and 42 u C and a range of phenotypic characteristics was examined using standard procedures (Gordon, 1966(Gordon, , 1967Gordon & Mihm, 1957;Yassin et al., 1995). Tolerance to NaCl (0-16 %) was tested in GYM broth. Biomass for chemotaxonomic studies was derived from a 7-day-old BHI broth shake culture incubated at 37 u C, harvested by centrifugation and washed with distilled water. Standard procedures were used to determine the isomeric form of diaminopimelic acid (Becker et al., 1964), whole-cell sugars (Lechevalier, 1968), nonhydroxylated fatty acids (Minnikin et al., 1980;Yassin et al., 2007), polar lipids (Yassin et al., 1993b) and isoprenoid quinones (Collins et al., 1977;Yassin & Hupfer, 2006). Genomic DNA extraction and PCR-mediated amplification of the 16S rRNA gene sequence were carried out using established procedures (Rainey et al., 1996). The purified PCR products were sequenced using a Taq DyeDeoxy...