the Eudistylia Vancouveri is unique because it has an opiculum which makes it possible to fully retract into the tube when predators are sensed.

It bears two bundles of radioles or feeding tentacles which together form the funnel-shaped multicolored branchial crown divided into two groups on the dorsal and ventral side of the head.

It has a central stiffening rod of connective tissue, a number of eyespots and a feeding groove.

The position of the setae on the abdominal segments is reversed, with the notochaetae being hooked and the neurochaetae being tufted.

[4] Members of this genus are found on the Pacific coasts of Canada, the United States and Mexico.