Pinnidae
The Pinnidae, commonly known as pen shells or fan mussels, are a family of saltwater bivalve mollusks. These distinctive mollusks are characterized by their elongated, wedge-shaped shells that are often adorned with intricate patterns. They are widely distributed in temperate and tropical waters around the globe, residing in both shallow and deeper environments.
Characteristics
Pinnidae species are known for their unique shell structure and morphology. Their shells are typically thin and fragile, lacking a true hinge and instead possessing a narrow ligament that allows them to open and close. Their shells are often adorned with colorful patterns and ridges, making them visually appealing. They also have a distinctive byssal threads, strong fibers that allow them to anchor themselves to rocks, coral, or other hard substrates.
Environments
Pinnidae inhabit a variety of marine environments, ranging from shallow intertidal zones to deeper waters. They are often found attached to rocky reefs, coral formations, and other hard substrates. Some species, such as the common pen shell (Pinna nobilis), are known to form large aggregations, creating dense gardens on the seabed.
Common Names
Pinnidae are commonly known as pen shells or fan mussels. They are also called sea pens, feather shells, or jingle shells in some regions.
References