ALEXANDER SEMENOV / SCIENCE PHOTO LIBRARY ALEXANDER SEMENOV / SCIENCE PHOTO LIBRARY
Sandworm body. Close-up of the body of a sandworm (Nereis pellagica), showing its parapodia (un jointed limb-like outgrowths) and setae (bristles). Sandworms are marine annelid worms that burrow in wet sand and mud using their parapodia and setae for locomotion. These structures are also used as gills for respiration.
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