EDINBURGH -Four animals previously unknown to science have been discovered in deep water off Scotland, the Scottish government has said.

New species of large sea snail, clam and marine worm were found during surveys by Marine Scotland. The clams and worm were at a suspected cold seep, an area where hydrocarbons are released from the seabed. All were discovered around Rockall, the remains of a volcano 260 miles (418km) west of the Western Isles. If confirmed, the cold seep would be the first to be discovered near Rockall. Some types of commercial fishing could be banned in the area to protect the habitat.

The new sea snail Volutopsius scotiae and clam Thyasira scotiae have been named after the research vessel MRV Scotia. The sea snails were discovered over an area at depths of up to one mile (1.6km). Another clam, Isorropodon mackayi, was named after mollusc expert David Mackay. The new species of marine worm Antonbrunnia has still to be named. It is currently being examined at the National Museum Wales.

The worm was discovered by Dr Graham Oliver inside one of the clams he was confirming as a new species at his laboratory at the museum. Environment Secretary Richard Lochhead said it was surprising how the creatures had eluded scientists until now. He said: “Our oceans are often called Earth’s final frontier and these new species prove just how much we still have to learn about this rich marine habitat.” Mr Lochhead added: “The area where these species were found is not currently fished and the confirmation of a cold seep is likely to result in the region being closed to bottom contact fishing.”

Jim Drewery, from Marine Scotland Science, oversaw the research on the deep water invertebrates. He said: “The discovery of these new species is absolutely incredible; especially when you consider that the sea snail measures a relatively large 10cm yet has gone undetected for decades.”