It grows to a length of about 20 cm (8 in) and lives in a burrow in soft sediment in the intertidal and subtidal zones.
The total length is up to 20 cm (8 in), the proboscis is white to beige, the collar is orange, red or reddish-green and the trunk is either brownish-green or rather pale.
[2] The species is native to the northwestern Atlantic Ocean where its range extends from Maine to Nova Scotia.
[2] S. bromophenolosus moves through the sediment by thrusting its proboscis forward and then contracting it longitudinally to form a swelling.
Food particles are trapped in mucus and moved to the mouth by ciliary action, and the worm also swallows a lot of sediment and presumably obtains some nourishment from detritus.