Crocodilurus is a lizard genus that belongs to the family Teiidae. It is monotypic, with only a single described species, Crocodilurus amazonicus, the crocodile tegu. It is locally known as the jacarerana. This semiaquatic lizard has a flattened, paddle-like tail and is found in the Amazon Basin and the Guiana Shield in South America. It feeds on arthropods, amphibians, reptiles and fish. It is not related to crocodilians.