nitrosomonas marina nitrosomonas marina nitrosomonas marina is an ammonia-oxidizing, aerobe, gram-negative bacterium from the genus of nitrosomonas. nitrosomonas marina scientific classification domain: bacteria phylum: pseudomonadota class: betaproteobacteria order: nitrosomonadales family: nitrosomonadaceae genus: nitrosomonas species: n. marina binomial name nitrosomonas marinakoops et al. 2001 type strain nm 22