Right: Photograph of the limpet Helcion
pellucidum pellucidum (L.) (alt. Patina
pellucida) by Ron Crosby.
Blue rayed limpets can be found grazing on kelp fronds, to which they
are tightly attached. Two species are found around Britain - pellucidum
pellucidum (pictured) and pellucidum laevis, in which the blue rays
can be seen on the apex of the shell only.