Dark Domed Limpet
A small, dark, glossy, dome / cap-shaped shell with an orange-amber edge. Most likely a limpet (a cap-shaped grazing sea snail) or a nerite — both are gastropods that live clamped onto intertidal rocks.
What it is
- A limpet is a single cone-shaped shell with no obvious coil; the animal clamps down on rock with a powerful muscular foot to survive pounding waves and resist drying at low tide. The dome shape sheds wave force like a tent.
- The dark colour is a mix of dark periostracum (organic skin) and mineral staining; the amber rim is the fresher, less-weathered growing edge.
- Built of calcium carbonate like every shell here.
Held note: this was the one I was holding for a question — included now in the deploy. If you want a deeper dive (limpet vs nerite — nerites have a small coil and a flat “door”/operculum; true limpets don’t), tell me and I’ll refine the ID.
Filed under the natural-artifacts collection.