Glyptonotus antarcticus is a large marine Chaetiliid isopod, which is one of common species in Antarctic waters. It has been recorded at South Georgia, South Orkneys and South Shetland Islands, the Antarctic Peninsula, and the Ross Sea. At a depth of 30 meters, this species plays a prominent role in the marine ecosystem as a dominant predator and scavenger, often displaying cannibalistic tendencies. Its diet consists of a wide variety of prey, including an unusually high percentage of echinoderms for an isopod.