prosthecomicrobium prosthecomicrobium prosthecomicrobium is a genus of aerobic bacteria which was isolated from freshwater samples. prosthecomicrobium scientific classification domain: bacteria phylum: pseudomonadota class: alphaproteobacteria order: hyphomicrobiales family: hyphomicrobiaceae genus: prosthecomicrobiumstaley 1968 type species prosthecomicrobium pneumaticum species p. hirschii p. pneumaticum