Pinna nobilis is a species of large, saltwater clam, also known as the noble pen shell or fan mussel. It is found in the Mediterranean Sea and is characterized by its elongated and fragile shell, which can grow up to a meter in length. Pinna nobilis has an important ecological role as a filter feeder and serves as a habitat for various marine species. Unfortunately, it is also threatened by factors such as pollution, habitat destruction, and overfishing, and is considered to be a protected species in many countries.
