hydrogenophaga hydrogenophaga hydrogenophaga is a genus of comamonad bacteria, several of which were formerly classified in the genus pseudomonas. hydrogenophaga scientific classification domain: bacteria phylum: pseudomonadota class: betaproteobacteria order: burkholderiales family: comamonadaceae genus: hydrogenophagawillems et al. 1989 species h. aquatica h. atypica h. bisanensis h. caeni h. crassostreae h. defluvii h. flava h. laconesensis h. luteola h. intermedia h. palleronii h. pseudoflava h. soli h. taeniospiralis