International audienceMagnetotactic bacteria (MTB) are a group of microorganisms that have the ability to synthesize intracellular magnetic crystals (magnetosomes). They prefer microaerobic or anaerobic aquatic sediments. Thus, there is growing interest in their ecological roles in various habitats. In this study we found co-occurrence of a large rod-shaped deltaproteobacterial magnetotactic bacterium (tentatively named LR-1) in the sediment of a Downloaded from https://academic.oup.com/femsle/advance-article-abstract/doi/10.1093/femsle/fnz253/5681391 by guest on 23 December 201