Tympanic membrane absent. Transversal processes of the vertebra sacralis notably widened. Pupil of the eye triangular. Skin tuberculate. Dorsal tubercles rounded rather than coming to a point. Dorsal surface dark-grayish to almost black, with large dark spots. In pools with opaque water, a sandy bottom and scarce riparian vegetation, the toads sometimes possess a bright-green dorsal coloration with scarce dark-green spots. Belly red or orange, with large bluish-black spots and numerous white points. On the belly, the bright coloration does not exceed the dark coloration in area. The inner surface of the leg is covered with small bright spots, which are not fused. In contrast to the female, the male has internal resonators, a slightly larger head and, during the breeding season, black nuptial pads on the 1st and 2nd fingers and on the inner surface of his forearm.