actimicrobium actimicrobium actimicrobium is a gram-negative, strictly aerobic and non-motile genus of bacteria in the family of oxalobacteraceae with one known species (actimicrobium antarcticum). actimicrobium scientific classification domain: bacteria phylum: pseudomonadota class: betaproteobacteria order: burkholderiales family: oxalobacteraceae genus: actimicrobiumkim et al. 2011 species a. antarcticum