The giant isopod is any of the almost 20 species of large isopods . They are abundant in the cold, deep waters of the Atlantic, Pacific, and Indian Oceans. They are often considered the largest isopod in the world, though other comparably poorly known species of Bathynomus may reach a similar size. The giant isopods are noted for their resemblance to the much smaller common woodlouse (pill bug), to which they are related