Brachidontes exustus

The valves of B. exustus can be dark blackish, yellow, green, or brown with toothed ribs. The anterior end of the valves extends past the umbo and there are up to four teeth at the hinge.^[3]

B. exustus can be found along the Atlantic coast of North America, ranging from Cape Hatteras to the West Indies and Brazil.^[2] They are an intertidal species that attaches to hard surfaces using strong thread-like proteinaceous structures called byssal threads. They often form clusters as the lowest intertidal zone. ^[3]