hydrogenophaga atypica hydrogenophaga atypica hydrogenophaga atypica is a gram-negative, oxidase-positive, rod-shaped, motile bacterium from the comamonadaceae family, which was isolated from wastewater from an activated sludge. colonies of h. atypica are pale yellow. hydrogenophaga atypica scientific classification domain: bacteria phylum: pseudomonadota class: betaproteobacteria order: burkholderiales family: comamonadaceae genus: hydrogenophaga species: h. atypica binomial name hydrogenophaga atypicakämpfer et al. 2005, sp. nov. type strain bsb 41.8, ccug 53902, cip 108118, dsm 15342