BrachiopodsArticulate/inarticulate DUse two pairs of plastic plates to show the difference between inarticulate and articulate brachiopods. The first pair is placed together their concave sides facing each other and with a piece of cord coming out between them. This represents inarticulate species. The second pair are held together with a hinge and one plate has a hole in it to allow the cord/pedical to come out.Anterior margin A P F 60min In this activity students determine the relationship between the sharpness of the anterior fold, the area of the opening and the size of sediment that could enter.Bivalves and Brachiopods A P 5 minThe students are provided with a box of about twenty Bivalves and Brachiopods. They must separate them.