Antarctic krill
Psychrobacter proteolyticus is a species of bacteria first isolated from the Antarctic krill "Euphausia superba". It excretes a cold-adapted metalloprotease. It is a strictly aerobic, strongly oxidase-positive, psychrotrophic, halotolerant, Gram-negative nonmotile coccobacillus; its type strain is CIP106830T (=DSM13887).