Polyplacophorans, commonly known as chitons, are marine mollusks characterized by their eight overlapping shell plates. They typically inhabit rocky shorelines and are adept at clinging to surfaces, which helps them resist strong waves and predators. Chitons have a broad, flat body and a muscular foot that allows them to move along the substrate. These creatures primarily feed on algae and other organic materials using a specialized feeding structure called a radula. Polyplacophorans exhibit a range of colors and sizes, with some species reaching up to 30 centimeters in length. They play an important role in their ecosystems by grazing on algae and contributing to the health of marine environments.