Appearance
It is a moderate-sized barnacle with a diameter of up to 22 mm. The shell is formed by overlapping plates. It has more the shape of a cylinder than the shape of a cone. The white operculum has heavily ridged walls. It can live up to ten years.It has been intensely studied in recent years as a model species for linking physical oceanography and population genetics surveys. This species was introduced to the shores of Argentina in the 1970s, and has become an invasive species, displacing other barnacles and mussels.
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