citromicrobium citromicrobium citromicrobium is an aerobic bacteria genus from the family of sphingomonadaceae with one known species (citromicrobium bathyomarinum). citromicrobium scientific classification domain: bacteria phylum: pseudomonadota class: alphaproteobacteria order: sphingomonadales family: sphingomonadaceae genus: citromicrobiumyurkov et al. 1999 species c. bathyomarinum