The Zebra Swallowtail ("Eurytides marcellus") is a North American butterfly. It is in the family Papilionidae. Some authors place the species under the genera "Iphiclides", "Graphium", and "Papilio". Its obvious black and white-striped pattern is like the pattern of a zebra. The Zebra Swallowtail is the official state butterfly of Tennessee.