The Red Nautilus is the first creature you come across in Eribu. It resembles a Gastropod (Snail) having a red foot, and a red shell with a green pulsating dot in the center. It slides along the contour of solid walls, floors and ceilings. It is unaffected by gravity. It only stops moving when destroyed or corrupted.
When corrupted, the Red Nautilus stops moving, but can still harm Trace.
The Red and Blue Nautilus share the same AI as the Geemers from Metroid, they will crawl along floors, walls and ceilings. When they reach a corner they rotate 90 degrees before continuing. The nautilus also suffers from the classic glitch that plagues Geemers, shooting a block they are crawling on causes them to be stuck in mid air rotating 90 degrees constantly.