pinna nobilis gigas chemnitz

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Pinna nobilis, common name the noble pen shell is a species of pen shell, a large marine bivalve mollusk in the family Pinnidae, the pen shells. This species is well-known as the origin of sea silk, made from the byssus of the animal. This species is endemic to the Mediterranean Sea. It lives offshore down to a depth of 20 meters. The shell of this species can grow as large as 60 cm (24 inches)