nitrosomonas ureae nitrosomonas ureae nitrosomonas ureae is an ammonia-oxidizing, aerobe, gram-negative bacterium from the genus of nitrosomonas. nitrosomonas ureae scientific classification domain: bacteria phylum: pseudomonadota class: betaproteobacteria order: nitrosomonadales family: nitrosomonadaceae genus: nitrosomonas species: n. ureae binomial name nitrosomonas ureaekoops et al. 2001 type strain nm 10