- Kingdom: Animalia
- Phylum: Mollusca
- Class: Bivalvia
- Order: Veneroida
- Family: Cardiidae
- Scientific name: Acanthocardia echinata
- Norwegian: pigget hjerteskjell
The 18 to 23 coarse ridges, covered by clearly visible prickles, are characteristic for the prickly cockle. The diameter of the rounded shell can reach 7 cm. The color is usually brown or orange.
It is usually partially buried in gravel or fine sand. It is tolerant for muddy sand, so you may encounter it in the fjords as well as off-shore.
It is registered in the North Sea, from Nordland, Norway to the Mediterranean.