mesorhizobium sediminum mesorhizobium sediminum mesorhizobium sediminum is a gram-negative, non-spore-forming, aerobic and non-motile bacterium from the genus of mesorhizobium which has been isolated from deep-sea sediments from the indian ocean. mesorhizobium sediminum scientific classification domain: bacteria phylum: pseudomonadota class: alphaproteobacteria order: hyphomicrobiales family: phyllobacteriaceae genus: mesorhizobium species: m. sediminum binomial name mesorhizobium sediminumyuan et al. 2016 type strain cctcc ab 2014219, kctc 42205, yim 12096