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.
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.
