sphingomonas rubra sphingomonas rubra sphingomonas rubra is a gram-negative, rod-shaped, neutrophilic and motile bacteria from the genus of sphingomonas which has been isolated from wastewater from a leather plant in china. sphingomonas rubra scientific classification domain: bacteria phylum: pseudomonadota class: alphaproteobacteria order: sphingomonadales family: sphingomonadaceae genus: sphingomonas binomial name sphingomonas rubrahuo et al. 2011 type strain bh3, cgmcc 1.9113, cip 110396, jcm 16230