Eunice pennata is a species of polychaete worm within the family Eunicidae. The species has a cosmopolitan distribution, mainly being found in subtropical to polar regions of oceans at depths of 813 to 1064 meters.[1] [2] Areas the species has the most observations include waters around Scandinavia, New England, southern Argentina and Chile, and the South Georgia and the South Sandwich Islands.[3] Individuals can reach lengths up to 150 millimeter with a width of 8 millimeters.[4]