Leddormer: Sabellidae. Leddormer: Terebellidae.
  • Creative Commons Attribution Share-alike | Maël Grosse

Sabellids are tubeworms that can project the feathery radioles outside of their soft tube. These radioles branchiae resemble a fan or a feather duster. They are used for breathing and to capture food particles from the water column. They may vary in size from a few millimetres up to 40 cm. Generally, they are found both on hard and in soft bottoms.

Sabellidae Latreille, 1825
Creative Commons Attribution | Maria Capa | University of the Balearic Islands
  • Creative Commons Attribution | Torkild Bakken

Terebellids are commonly known as spaghetti worms due to the extensible anterior tentacles that can extend a lot longer than the body length to collect food particles on the sediment. 

Terebellidae Johnston, 1846
Creative Commons Attribution | Arne Nygren | Institutionen för marina vetenskaper, Göteborgs Universitet