A close-up of a northern feather duster (Eudistylia vancouveri) plume shows the banded maroon and dark blue-green pattern of the tentacles when a light shines across them. Without illumination the tentacle crowns appear almost black. Northern feather duster worms live in long parchment-like tubes that can reach over 24 inches (61 cm) in length. Large masses of these tubeworms can cluster together along rock walls and floating docks. The northern feather duster has a range from southern Alaska to central California.