GLYCYMERIS INSUBRICA

The central umbo is convex (not tilted either forward or backward). Concentric striations are visible on the umbo and continue across both valves, intersecting with fine radial lines to form a reticulated pattern. Like other species, the Insubrica lives in shallow waters, primarily in the Mediterranean Sea and the Eastern Atlantic Ocean (particularly along the coasts of Gibraltar and northern Morocco).

Its external coloration ranges from grey to violet to brownish shades of varying intensity. The interior of the shell is white. Some specimens of Glycymeris insubrica have been found in a prehistoric village dating back to the Late Bronze Age.

What distinguishes it from other species?

1. A sub-rectangular shape;
2. A thinner shell;
3. Finer hinge teeth;
4. A characteristic violet coloration;
5. Thin radial ribs;
6. Porcelain-white interior;
7. Pale spots near the umbo.