A denitrifier micro-organism was isolated from an upflow denitrifying filter inoculated with an activated sludge. The cells were Gram-negative, catalase-and oxidase-positive curved rods and very motile. They were aerobic as well as anoxic heterotrophs that had an atypical respiratory type of metabolism in which oxygen and nitrogen oxides were used simultaneously as terminal electron acceptors. The G+C content was 65 mol%. Our isolate was phenotypically similar to , according to classical systematic classification systems. However, a phylogenetic analysis based on the 16S rRNA sequence showed that the aerobic denitrif could not be assigned to any currently recognized genus. For these reasons a new genus and species, gen. nov., sp. nov., is proposed, for which SGLY2is the type strain.


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