Nuciruptor is an extinct genus of platirrhine primate that lived in South America, classified inside the family Pitheciidae. The only species of the genus is N. rubricae, which was described from a mandibular fragment found in the fossil site known as La Venta in Colombia in strata of the Middle Miocene, roughly 12,8 million years ago. Its dental morphology classifies it inside the subfamily Pitheciinae; it is related with the species Cebupithecia sarmientoi, found in the same place. The same dental morphology of Nuciruptor suggests that it fed of seeds like the living pitecinos. Had an also similar size to its living relatives, with a weight estimated of 2 kg.