Smooth Clam

Overview

The Smooth Clam (Callista chione) is a large, robust bivalve mollusc recognized for its polished, glossy shell. It is a temperate species widely distributed across the Mediterranean Sea and the Eastern Atlantic, ranging from the British Isles to the Cape Verde Islands.

Distribution & habitat

This species typically inhabits sandy or gravelly seabeds, often burying itself in the substrate. While it is commonly found in shallow coastal waters, it can be encountered at depths ranging from just offshore down to approximately 200 meters.

Appearance

The shell is oval-shaped, thick, and smooth, often displaying a porcelain-like finish. Its exterior color varies from light beige or greenish-cream to reddish-brown or chestnut, frequently featuring darker, radiating streaks. The interior of the shell is typically white or soft pink. Fine, concentric growth lines are visible on the surface, and the umbones (the oldest part of the shell) are prominent and offset toward the anterior end.

Biology & behavior

As a filter feeder, the Smooth Clam plays an important role in its ecosystem by sieving plankton and organic matter from the water column using its gills. It is a relatively long-lived species, with some individuals reaching up to 17 years in the wild, though it has the potential for greater longevity. The species is also commercially harvested in several Mediterranean countries, where it is valued for its delicate flavor.