sphingomonas histidinilytica sphingomonas histidinilytica sphingomonas histidinilytica is a gram-negative and non-spore-forming bacteria from the genus of sphingomonas which has been isolated from hexachlorocyclohexane contaminated soil from a dump site in ummari near lucknow in uttar pradesh in india. sphingomonas histidinilytica scientific classification domain: bacteria phylum: pseudomonadota class: alphaproteobacteria order: sphingomonadales family: sphingomonadaceae genus: sphingomonas binomial name sphingomonas histidinilyticanigam et al. 2010 type strain ccm 7545, mtcc 9473, um2