sphingomonas trueperi sphingomonas trueperi sphingomonas trueperi is a gram-negative soil bacterium. sphingomonas trueperi scientific classification domain: bacteria phylum: pseudomonadota class: alphaproteobacteria order: sphingomonadales family: sphingomonadaceae genus: sphingomonas binomial name sphingomonas trueperikämpfer et al. 1997 synonyms pseudomonas azotocolligans anderson 1955