The Clam Worm (Neanthes virens) is a common salt water invertebrate found in the waters of the Bay of Fundy. Clam Worms are free swimming segmented worms. Each segment has a pair of bristly, paddle like appendages (parapodia) that enable the worm to swim or crawl along the sea floor. Clam Worms feed on algae and other invertebrates that they find while burrowing in the sand or mud. They are a food source for bottom feeding fish and crabs.