asprobacter asprobacter asprobacter is a gram-negative and aerobic genus of bacteria from the family of hyphomonadaceae with one known species (asprobacter aquaticus). asprobacter aquaticus has been isolated from fresh water. asprobacter scientific classification domain: bacteria phylum: pseudomonadota class: alphaproteobacteria order: caulobacterales family: hyphomonadaceae genus: asprobacterjin et al. 2017 species a. aquaticus