Leptodactylus rhodomystax (common name: Loreto white-lipped frog, rose-lipped thin-toed frog) is a species of frog in the Leptodactylidae family. Its local name is sapo-rana rugoso de Boulenger ("Boulenger's rough toad-frog").It is found in the Guianas (French Guiana, Guyana, and Suriname) through northern and central Brazil to Amazonian Bolivia, Colombia, Peru, and Ecuador, and possibly in Venezuela where most if not all records represent misidentifications of Leptodactylus riveroi. Leptodactylus rhodomystax are small frogs: the two syntypes measured 25 mm (0.98 in) in snout–vent length.