nitrosomonas aestuarii nitrosomonas aestuarii nitrosomonas aestuarii is a gram-negative, aerobe, bacterium from the genus of nitrosomonas which metabolize ammonia to nitrite for its source of energy. nitrosomonas aestuarii scientific classification domain: bacteria phylum: pseudomonadota class: betaproteobacteria order: nitrosomonadales family: nitrosomonadaceae genus: nitrosomonas species: n. aestuarii binomial name nitrosomonas aestuariikoops et al. 2001 type strain nm 36