Tipal O or Sand Worm A "sand worm" can refer to a real marine creature or a giant, fictional desert monster popularized by the Dune series. The context usually makes the meaning clear. The real-world sandworm In biology, a sandworm is a type of marine bristle worm, a class of annelid with many bristles on its body. Appearance: They have characteristic blue heads with two large pincer teeth, and their bodies are covered in external protrusions called parapodia that function as both gills and legs

Meet the marine worm with 100 butts that can each grow eyes and a brain

Marine food webs