PSEUDAMUSSIUM CLAVATUM

This species of scallop reaches a maximum length of 4 cm, but we usually find specimens measuring 2–3 cm. It features a rounded shell that is longer than it is wide. The right valve is more convex than the left, and both valves have two lateral extensions, known as “ears”, that are nearly symmetrical. The dorsal margin of each auricle is shorter than half the total length of the valve.

One of the distinguishing features of this species are the radial ribs (5–6) and a swollen ventral margin.

The radial ribs are easily recognizable and vary in width, but all radiate from the hinge. Unlike the external surface, the inner surface of the valves does not show any radial ribbing.

As for coloration, Pseudamussium clavatum ranges from dark reddish tones to a mottled white pattern, with darker streaks and spots contrasting against the base color. The inner surface is whitish, often with violet, brownish, or pinkish hues.

This species thrives at greater depths, up to 65 meters, and prefers sandy-muddy seabeds. It can be found in:

1. the Mediterranean Sea;
2. the Eastern Atlantic, from the Bay of Biscay (also recorded off the coasts of England and Scotland) down to Morocco.