hydrogenophaga aquatica hydrogenophaga aquatica hydrogenophaga aquatica is a gram-negative, rod-shaped and aerobic bacterium from the genus of hydrogenophaga which has been isolated from a hot spring. hydrogenophaga aquatica scientific classification domain: bacteria phylum: pseudomonadota class: betaproteobacteria order: burkholderiales family: comamonadaceae genus: hydrogenophaga species: h. aquatica binomial name hydrogenophaga aquaticalin et al. 2017 type strain bcrc 80937, jcm 31216, strain cc-kl-3