Question: what is the difference between articulate and inarticulate brachiopods?
Answer: Articulate brachiopods have toothed hinges and simple opening and closing muscles, while inarticulate brachiopods have untoothed hinges and a more complex system of muscles used to keep the two valves aligned. ... The word "brachiopod" is formed from the Ancient Greek words brachion ("arm") and podos ("foot").