Found this sea-urchin on the beach today. I think it is the green sea urchin - Psammechinus miliaris. It was stranded on the beach, so not sure whether it was dead or alive. They feed on young barnacles and sea-squirts.
This is the outer casing or test of the edible sea-urchin - Echinus esculentus. I found this one on Lower Largo beach many years ago. At that time there were a lot of these on the beach at Largo Bay, not many whole but a lot of broken ones, but it's a long time since I've even seen a small fragment.
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