quadricoccus australiensis quadricoccus australiensis quadricoccus australiensis is a gram-negative, oxidase-negative, catalase-positive, aerobic, non-motile bacterium from the genus of quadricoccus which was isolated from activated sludge biomass sample in australia. quadricoccus australiensis scientific classification domain: bacteria phylum: pseudomonadota class: betaproteobacteria order: rhodocyclales family: rhodocyclaceae genus: quadricoccus species: q. australiensis binomial name quadricoccus australiensismaszenan et al. 2002 type strain ben 117, cip 107055, kctc 12953, ncimb 13738