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Terebellida is an order of marine polychaete worms, commonly known as "shag-rug worms" or "towntail worms." These are sedentary, tube-dwelling annelids that can grow up to 40 cm in length.1

Key characteristics of Terebellida include:
* Filamentous Tentacles: They possess numerous, often showy, filamentous tentacles around their head, which are used for feeding.23
* Gills: Terebellids have simple or branched gills located on the dorsal surface of their anterior end.1
* Tube Dwelling: They construct tubes from a mucoid substance to which sediment adheres.1
* Body Structure: Their bodies are divided into a thorax and abdomen.1

The family Terebellidae, which gives the order its name, is nearly cosmopolitan in distribution.3

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