It is a bivalve mollusk with a quadrangular shell, the color goes from light brown to yellow, it is smooth and not very solid.
The size generally ranges from 12 to 15 centimeters, but can even reach 17 centimeters in length. The assembled siphons emerge from the upper end, while the foot, the movement organ, protrudes from the lower one, which they use to withdraw under the sand.
It is a mollusk with an intense, sapid, almost spicy taste. That of Olbia is particularly consistent and sought after.