The sting of a jellyfish can range from a mild annoyance to a life-threatening incident, depending on the species. Reports of severe stings in coastal ponds along the coast of Cape Cod in recent years have sparked concern that a new, more virulent jellyfish may have entered the area. It turns out the jellyfish responsible – known as a clinging jellyfish - may have been here for more than a century. Clinging jellyfish (Gonionemus vertens) are small, somewhere between the size of a dime and a