methylorubrum rhodinum methylorubrum rhodinum methylorubrum rhodinum is a gram-negative soil bacterium. methylorubrum rhodinum scientific classification domain: bacteria phylum: pseudomonadota class: alphaproteobacteria order: hyphomicrobiales family: methylobacteriaceae genus: methylorubrum binomial name methylorubrum rhodinum(heumann 1962) green and ardley 2018 synonyms methylobacterium rhodinum corrig. (heumann 1962) green and bousfield 1983 pseudomonas rhodos heumann 1962 (approved lists 1980) methylobacterium rhodos (heumann 1962) green and bousfield 1983