Galeommatoidea

The superfamily Galeommatoidea comprises tiny bivalve mollusks, typically less than 10 millimeters long, that form highly intimate relationships with other marine invertebrates, particularly on soft shores and coral reefs. Most are commensal, meaning they associate with a host without causing harm, and exploit it for protection, food, and respiratory currents. They often share burrows with polychaete worms and crustaceans, sometimes attaching directly to their hosts. Some Galeommatoidea are also parasitic. These associations have led to their miniaturization.12