Melanophryniscus krauczuki is a species of toads in the family Bufonidae. It is found in the Misiones Province in northeastern Argentina and the Itapúa Department in the adjacent Paraguay. The specific name krauczuki honors naturalist and ornithologist Ernesto Krauczuk. Common name Krauczuk's redbelly toad has been proposed for this species.
Adult males measure 18–23 mm (0.7–0.9 in) and adult females 21–24 mm (0.8–0.9 in) in snout–vent length. The body is stout. The snout is short. No tympanum is visible. The fingers are short and slightly webbed. The toe are partially webbed. Skin is dorsally rugose and scattered with blunt, rounded warts that are tipped with one or more keratinized spinules. Dorsal coloration ranges from light brown to dark brown, sometimes with a lighter scapular area bot otherwise uniform. The belly is dark brown with irregular orange spots that range from being very small to large and covering most of the belly. Males have a subgular vocal sac.
