With a nerve cord down its back, it has not true skeleton, but is regarded as the modern representative of the first animals that evolved a backbone said the Government release. It is usually found buried in shallow sand in temperate or tropical seas, commercially harvested as petfood.
Other marine survey rare finds which covered over 2,000 square miles, included  giant mussels with shells measuring up to 18 inches , new communities of the exquisite Northern Feather Star (above) a brightly colored species with 10 feather-like arms fanning out from a central disc, found off the Sound of Canna, near Skye.

The Flame Shell beds below in Loch Linnhe, Argyll, are also a species only found in a very few west coast locations with bright orange feeding tentacles.