Two new strains (AS130 and AS140) of phototrophic purple nonsulfur bacteria isolated from activated sludge were characterized and compared with and some other species of the genus . The new isolates produced pink photosynthetic cultures, had rod-shaped cells that divided by budding, and formed intracytoplasmic membranes of the lamellar type together with bacteriochlorophyll and carotenoids of the normal spirilloxanthin series. They were also characterized by their capacity for complete denitrification and their production of both ubiquinone-10 and rhodoquinone-10 as major quinones. The isolates were phenotypically most similar to but exhibited low levels of genomic DNA hybridization to this species and to all other species compared. Phylogenetic analyses on the basis of PCR-amplified 16S rRNA gene sequences showed that our isolates and formed a cluster distinct from other members of the genus . The phenotypic, genotypic, and phylogenetic data show that the new isolates and should be placed in a new single genus rather than included in the genus . Thus, we propose to transfer to a new genus, , as gen. nov., comb. nov. (type species) and to designate strains AS130 and AS140 a new species, sp. nov.


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