Body elongate, worm-like, up to 10 mm in length; coloured intense red.
There are 10 simple, finger-like tentacles.
This species lacks tube-feet.
The skin does not contain any calcareous deposits.
This species has been found living on rather coarse sand, not burried in the ground; at depths of 20 m.
In the North Sea it is only known from Helgoland. Elsewhere it has been found in Brittany (along the French coast). This species is likely to have a more widely distributed.