Glyceridae mostly burrow in sandy substrates by means of an eversible probosics.

   Glyceridae are very active worms. When they are dug out, they lash about vigorously and shoot out a probosics almost half as long as the body in an attacking mode. At the tip of the proboscis there are well developed jaws. 

 Most species are predators or carnivores.

Whole segment

   Conical prostomium which is long and tapered.

  The tip of prostomium with four small biannulate antennae. One to two pairs of eyes. No palps.

   Long proboscis with four jaws or two jaws and a circle of paragnaths. The surface is papillose, and V-shaped chevrons may be present near the base.

   Parapodia are uniramous or biramous with simple notosetae and compound neurosetae.

   Branchia may be present or absent.

   Biramous parapodia