hyphomicrobium hyphomicrobium hyphomicrobium is a genus of gram-negative, non-spore-forming, rod-shaped bacteria from the family of hyphomicrobiaceae. it has a large polar or sub-polar filiform prostheca very similar to that of caulobacter. in addition to having a nutritional function, the prostheca also plays a role in the initiation of dna replication. hyphomicrobium scientific classification domain: bacteria phylum: pseudomonadota class: alphaproteobacteria order: hyphomicrobiales family: hyphomicrobiaceae genus: hyphomicrobiumstutzer and hartleb 1899 type species hyphomicrobium vulgare species h. aestuarii h. chloromethanicum h. coagulans h. denitrificans h. facile subsp. facile subsp. tolerans subsp. ureaphilum h. hollandicum h. methylovorum h. nitrativorans h. sulfonivorans h. vulgare h. zavarzinii reproduction in hyphomicrobium begins when its hyphal filament (prostheca) grows from one end of the cell (this happens when the cell no longer has a flagellum) and the bud grows from the tip of the prostheca that eventually differentiates into a new swarmer cell. 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. hyphomicrobium hyphomicrobium nitrativorans hyphomicrobium zavarzinii hyphomicrobium facile hyphomicrobium denitrificans outgroup filomicrobium