Diplocirrus glaucus

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Diplocirrus glaucus is a small marine worm (a polychaete) in the Flabelligeridae family. It lives on the sea floor where the bottom is mud, sand, shells, or gravel. It eats detritus and microorganisms. It is found in the Arctic, the Mediterranean, and the eastern North Atlantic, down to about 750 meters deep.

Its body has a spindle-shaped front end and a more cylindrical back end. The head area (prostomium) has four eyes and two long palps. The next part (peristomium) has eight gills: four short finger-shaped ones and four longer threadlike ones, which can retract into the body. Its color ranges from pearl-grey to silver-white and it grows up to about 25 millimeters long. It lives in tunnels on the sea floor, secreted slime helping to build them, and it feeds on detritus and microorganisms inside.