brucellaceae brucellaceae the brucellaceae are a family of the gram-negative hyphomicrobiales. they are named after sir david bruce, a scottish microbiologist. they are aerobic chemoorganotrophes. the family comprises pathogen and soil bacteria brucellaceae brucella spp. scientific classification domain: bacteria phylum: pseudomonadota class: alphaproteobacteria order: hyphomicrobiales family: brucellaceaebreed et al. 1957 genera brucella meyer and shaw 1920 (approved lists 1980) daeguia yoon et al. 2008 falsochrobactrum kämpfer et al. 2013 "noguchia" olitsky et al. 1934 paenochrobactrum kämpfer et al. 2010 pseudochrobactrum kämpfer et al. 2006 phylogeny the currently accepted taxonomy is based on the list of prokaryotic names with standing in nomenclature (lpsn). the phylogeny is based on whole-genome analysis. brucellaceae pseudochrobactrum falsochrobactrum daeguia paenochrobactrum brucella outgroup phyllobacterium