- Kingdom: Animalia
- Phylum: Brachiopoda
- Class: Rhynchonellata
- Order: Terebratulida
- Family: Cancellothyrididae
- Scientific name: Terebratulina retusa
- Norwegian: -
The maximum shell width is 3 cm. The shell has 11 to 14 radial ribs. The white shells are usually covered by a thick layer of a protein-based substance. The ventral valve has a small hole where a stalk extends to attach the animal to the substrate. Similar species in Norway are Macandrevia cranium and T. septentrionalis.
This, the most common lamp shell in Norway, is most frequent on hard substrate, deeper than 30 metres. At rare occasions it can be found as shallow as 15 metres.
This lamp shell is widespread in the North Atlantic Ocean and the Mediterranean.