sphingomonas echinoides sphingomonas echinoides sphingomonas echinoides is a gram-negative soil bacterium. sphingomonas echinoides scientific classification domain: bacteria phylum: pseudomonadota class: alphaproteobacteria order: sphingomonadales family: sphingomonadaceae genus: sphingomonas species: s. echinoides binomial name sphingomonas echinoides(heumann 1962) denner et al. 1999 synonyms pseudomonas echinoides heumann 1962