microvirga vignae microvirga vignae microvirga vignae is a nitrogen-fixing bacteria from the genus of microvirga which has been isolated from the brazilian semiarid region. microvirga vignae scientific classification domain: bacteria phylum: pseudomonadota class: alphaproteobacteria order: hyphomicrobiales family: methylobacteriaceae genus: microvirga species: m. vignae binomial name microvirga vignaeradl et al. 2014 type strain hambi 3457, br10192, br10193, br10194, br10195