exiguobacterium sibiricum exiguobacterium sibiricum exiguobacterium sibiricum is a bacterium. the dr11 strain of these bacteria has been found to eat polystyrene. it was discovered in india, in wetlands by researchers in shiv nadar university. it was discovered alongside exiguobacterium undrae strain dr14. exiguobacterium sibiricum scientific classification domain: bacteria phylum: bacillota class: bacilli order: bacillales family: bacillaceae genus: exiguobacterium species: e. sibiricum binomial name exiguobacterium sibiricumrodrigues et al. 2006