pseudomonas carboxydohydrogena pseudomonas carboxydohydrogena 'pseudomonas' carboxydohydrogena is a species of gram-negative bacteria. following 16s rrna phylogenetic analysis, it was determined that 'p.' carboxydohydrogena belonged in the bradyrhizobium rrna lineage. it has not yet been further classified. 'pseudomonas' carboxydohydrogena scientific classification domain: bacteria phylum: pseudomonadota class: alphaproteobacteria order: hyphomicrobiales family: nitrobacteraceae genus: afipia binomial name 'pseudomonas' carboxydohydrogena(ex sanjieva and zavarzin 1971) meyer et al. 1980 synonyms seliberia carboxydohydrogena sanjieva and zavarzin 1971