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The only organohalide-respiring Epsilonproteobacteria (ε-proteobacteria) described so far are found in the genus Sulfurospirillum . This genus consists of versatile, often microaerophilic bacteria, growing with many different growth substrates. Only a few of these organisms use halogenated compounds, mainly chlorinated ethenes, as electron acceptors. Organohalide respiration was extensively studied in Sulfurospirillum multivorans, but seems to be similar in other reductively dehalogenating Sulfurospirilla like Sulfurospirillum halorespirans. While most Sulfurospirillum species are unable to utilize organohalides as electron acceptors, many of them grow with other toxic substrates such as arsenate or selenate. Other typical electron acceptors are nitrate and sulfur compounds. Electron donors used are pyruvate, hydrogen and formate. The anaerobic respiratory chains of …