The genus is proposed for aerobic endospore-forming Gram-variable rod-shaped bacteria, which are ammonium-dependent, obligately oxalotrophic and haloalkalitolerant, oxidase- and catalase-positive, mesophilic and motile by peritrichous flagella. Cell wall contained two electron-dense layers. The external layer consists of a chain of electron-dense granules morphologically resembling the cellulosomes of . Two species are described, gen. nov., sp. nov. and gen. nov., sp. nov. The type strains of these species are strains RAOx-1 (= DSM 11538) and RAOx-FS (= DSM 11537), respectively. strains were isolated from the rhizosphere of sorrel () and from decaying wood. The strains require a high concentration of ammonium ions and use oxalate as the sole organic source of carbon and energy for growth; no growth factors were required. Growth occurred at pH 6·8--9·5. The optimum temperature and pH for growth were 28--30 °C and 8·0--8·5. All strains grew in a saturated solution of ammonium oxalate, and tolerated 3% NaCl. Whole-cell hydrolysates contain -diaminopimelic acid and glucose. The menaquinone of the strains was MK 7, and the major cellular fatty acids were 12-methyl tetradecanoic, -hexadec-9-enoic and hexadecanoic acids. The G+C content of the DNA was 45--46 mol% for and 42 mol% for . The almost complete 16S rDNA sequence of three strains of the two species of shows that the genus falls into the radiation of the subphylum of Gram-positive bacteria. The closest phylogenetic neighbour of is . The DNA-DNA hybridization value between strains RAOx-1 and RAOx-FS was 39·7%.


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