Brachiopoda possess a hard shell that acts as their skeleton, which is composed of two distinct valves. Unlike the bivalves, brachiopods’ shells are not symmetrical and differ in shape and size. The outer layer is typically made of calcium carbonate or chitin, providing structural support and protection.
The shell’s design allows brachiopods to attach to substrates in their marine environments. The interior of the shell contains soft body parts that are essential for their feeding and reproduction. These characteristics enable brachiopoda to thrive in various aquatic habitats, often found in deep-sea environments.