European Bittersweet Clam

Overview

The European Bittersweet Clam, also known as the dog cockle or amande de mer, is a robust marine bivalve found in European waters. Despite its common name, it is not closely related to the common cockle, but is instead a member of the bittersweet clam family, named for the sweet, nutty flavor of its flesh.

Distribution & habitat

This species is widely distributed from Norway in the north to the coasts of West Africa, including the Mediterranean Sea, where it is less common. It is a gregarious, burrowing animal that thrives in various substrates, including fine shell gravel, sandy mud, and coarse sand, typically living in shallow, subtidal environments.

Appearance

The shell is thick, solid, and nearly circular in outline. Its exterior displays a range of colors, including brown, yellow, or light purplish-red, often featuring irregular, concentric zigzag patterns on a cream background. A distinctive, velvety, dark brown periostracum forms a broad band around the shell margins. The interior is generally brown within the pallial line and features a characteristic taxodont hinge with six to 12 teeth on either side of the beak.

Biology & behavior

As an infaunal species, it lives partially buried in the substrate. Like other members of its family, it is a suspension feeder that relies on filtering organic matter from the water column. It is known to be an active burrower, capable of moving through the sediment to maintain its position.