Huge sea potato

April 1st 2018

The fragile shells or tests of sea potatoes or heart urchins are regularly found on Assynt beaches, but I have never before seen one as large as this.  It was collected from the eastern shore of Oldany Island (NC0934) by Wendy Glover, after she and Steve Collie had canoed across on 4th March 2018.

Sea potatoes are recorded up to 90mm, the length of this one.  Much more usual are examples up to 40mm, like the other shown here, which, by coincidence, Gwen Richards and I found at Achmelvich the same day.

These tests have lost their ‘furry’ coating of recumbent spines, which in life help them to burrow down to 150mm beneath the sandy seabeds which are their natural habitat.  They are one of the commoner examples, on local shores, of the echinoderms, a large group of exclusively marine organisms, uniquely 5-radiate in design, which also include starfish, brittle stars and sea cucumbers.

Ian Evans

Report a Sighting

Recent Sightings

Great Northern Diver

four birds, Loch Dhrombaig (DAH) (19/02)

Harbour Porpoise

two animals off Bay of Clachtoll (DAH) (13/02)

Redshank

three birds, Bay of Culkein (DAH) (13/02)

Curlew

15 birds flying between Stoer and Clachtoll (DAH) (13/02)

Pygmy Shrew - skull in owl pellet

skull of Pygmy Shrew, along with those of two Field Voles, found after examination of probable Tawny Owl pellet, Clachtoll Peat Track, Creag Clais nan Cruineachd (Gwen Richards and Ian Evans) (13/02)

Otter

single animal in Loch Inver opposite Spar shop (Ian and Jane Young) (12/02)

Barn Owl

single bird near Loch an Ordain, Clachtoll (Yates family) (12/02)

Stoat

single animals in Achnacarnin (Pam Mackenzie) and Raffin (Hilary Richardson) (11/02)

Map