LOPHOPHORATES

"The ring of tentacles that scientists call the "lophophore" unites three otherwise very different looking kinds of animals: brachiopods have two shells and look very much like clams. Bryozoans on contrast are tiny colonial organisms. And the phoronids actually look more like worms. Brachiopods are quite rare right now in the world's oceans, but they used to dominate life in the seas 500 million years ago."