What are unique characteristics of brachiopods?

Brachiopods are marine invertebrates characterized by their two-part shell, which is typically symmetrical and can resemble bivalves but is structurally distinct. They possess a lophophore, a specialized feeding structure that helps them filter food from water. Unlike bivalves, brachiopods have a dorsal and ventral valve rather than a left and right valve, and they anchor themselves to the substrate using a stalk called a pedicle. These characteristics, along with their long fossil record dating back to the Cambrian period, highlight their unique evolutionary position within the animal kingdom.