Pinna nobilis, the largest bivalve of the Mediterranean (the shell can reach up to a metre in length) has buried with it's sharp end into the soil at the border of the Octopus Glade.
From the ancient times and up to the beginning of the twentieth century byssus threads, that anchor mollusc in the ground, were used in manufacturing beautiful and durable golden fabric called sea silk. It was quite expensive.
According to some information, Tutankhamen had his dresses made of sea silk. Volto Santo di Manoppello is woven from the byssus threads. There is also a belief, that the Golden Fleece searched by Jason and the Argonauts is owing it's appearance to the noble pen shell.
Nowadays Pinna swiftly becomes extinct because of the human activity.