fluviicoccus fluviicoccus fluviicoccus is a genus of bacteria which belongs to the class gammaproteobacteria with one known species (fluviicoccus keumensis). fluviicoccus keumensis has been isolated from freshwater. fluviicoccus scientific classification domain: bacteria phylum: pseudomonadota class: gammaproteobacteria order: pseudomonadales family: moraxellaceae genus: fluviicoccuskim et al. 2016 species f. keumensis