Upper and low aspects of the small mollusc (similar to the Saddle Oyster - Anomia ephippium but much smaller). Widely recorded in UK and Irish waters. Sample shown from Scapa Flow (Orkney).
<em>Heteranomia squamula</em> (Linnaeus, 1758)
Distributed from Norway south to the Mediterranean.
Lives on bottoms of coarse sand and gravel attached to rocks or other shells.
- Two muscle scars on the upper valve are joined.
- The muscle scars are furrowed
Fragile shell up to 4cm in length. Dirty white or brown in colour on the outside. The inisde is dark green and glossy. The surface is sculptured with fine concentric and radiating lines.