sphingobacterium psychroaquaticum sphingobacterium psychroaquaticum sphingobacterium psychroaquaticum is a gram-negative and psychrophilic bacterium from the genus of sphingobacterium which has been isolated from lake water from the lake michigan in wisconsin in the united states. sphingobacterium psychroaquaticum scientific classification domain: bacteria phylum: bacteroidota class: sphingobacteriia order: sphingobacteriales family: sphingobacteriaceae genus: sphingobacterium species: s. psychroaquaticum binomial name sphingobacterium psychroaquaticumalbert et al. 2013 type strain dsm 22418, mol-1, nrrl b-59232 synonyms sphingobacterium aquatica