paenochrobactrum paenochrobactrum paenochrobactrum is a genus of gram-negative, oxidase-positive, non-spore-forming, nonmotile bacteria of the family brucellaceae. paenochrobactrum scientific classification domain: bacteria phylum: pseudomonadota class: alphaproteobacteria order: hyphomicrobiales family: brucellaceae genus: paenochrobactrumkämpfer et al. 2010 type species paenochrobactrum gallinarii species p. gallinarii p. glaciei p. pullorum