Three species of Amphiuma exist and can be differentiated by their number of toes. The two-toed Amphiuma means is the most widely distributed, but there are also three-toed and one-toed varieties that can be found in wetland areas of the southeastern United States. The elongate bodies of Amphiumas can reach up to three feet in length, dependent on species, and their body color is generally dark brown or gray. The undersides of Amphiumas, however, are usually a lighter shade than the rest of their bodies.