sphingobacterium populi sphingobacterium populi sphingobacterium populi is a gram-negative, aerobic and non-motile bacterium from the genus of sphingobacterium which has been isolated from the bark of the tree populus × euramericana. sphingobacterium populi scientific classification domain: bacteria phylum: bacteroidota class: sphingobacteriia order: sphingobacteriales family: sphingobacteriaceae genus: sphingobacterium species: s. populi binomial name sphingobacterium populili et al. 2016 type strain cfcc 11742, kctc 42247, 7y-4