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Pinna nobilis (commonly referred to as the noble pen shell) is the largest bivalve in the Mediterranean, with lengths eclipsing one meter. It has been used by mankind for hundreds of years as a source of food and for its sea silk, and it is now an endangered species. It processes up to 6 liters of sea water every hour, filtering out the phytoplankton it uses as a main food source. It lives in depths ranging from 0.5 to 60 meters.


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Field Museum of Natural History

Source: Field Museum phylogenetics class

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