Genus
Common name: Pen Shell
Scientific name: Atrina
Atrina is a genus of bivalve mollusks known as pen shells. They are characterized by their elongated, pen-like shells and are found in sandy or muddy substrates in shallow waters. Pen shells are filter feeders, drawing in water to extract plankton and organic particles. They are not commonly kept in home aquariums due to their size and specialized habitat requirements. However, they play a significant role in their natural ecosystems by filtering water and providing habitat for other marine organisms.