A genetic study has identified two previously unrecognized species of howler monkey in the Amazon, and both already face serious threats, Live Science reported. The species were named Alouatta iroi and Alouatta matogrossensis. They have bushy beards and bright red fur, and their identification raises the number of known howler monkey species to 16, according to a University of Gothenburg statement quoted in the report. "Our study shows that the Amazon still holds remarkable biological secrets, even among well-known animals such as howler monkeys," said first author Romina Batista, a biodiversity scientist at the University of Gothenburg and the University of Salford. The paper was published Oct. 30 in Communications Biology.
A. matogrossensis is probably on the brink of extinction, the researchers said. A. iroi faces threats from a planned dam on the Rio Branco River. The study did more than add names to a list: it used genetic analysis to redraw branches of the howler evolutionary tree, showing that animals once lumped with better-known species are distinct. Discoveries of this kind matter for conservation because legal protections and habitat plans are often written around formally recognized species. If a population is treated as a local variant of a widespread monkey, it can disappear without ever appearing on an endangered-species register.
Howler monkeys are among the most familiar large primates in the Amazon, known for calls that carry through the canopy. That familiarity, Batista suggested, can hide gaps in the science. The new work argues that even a well-studied group can still yield surprises when researchers look closely at DNA and geography. Live Science noted that one of the two new species is already close to being lost, and that a dam project is a direct threat to the other, so the taxonomic news arrives with an urgent practical hook rather than as a quiet museum revision.
The verified result is a published species description and a conservation warning, not a completed protection plan or a claim that either monkey has already gone extinct. Formal names, a new count of 16 howler species, and named threats to both populations are what the study and the accompanying statement put on the record. The team analyzed genomes of 11 howler species in South and Central America, combining existing DNA with new data from Brazilian zoological collections. Howlers diverged from close relatives between 19 million and 13.5 million years ago, the study found, and large rivers such as the Amazon, the Xingu and the Branco kept groups from mixing, driving separate traits. The researchers also argued that the Tapajós red-handed howler and the Amazonian black howler are not as closely related as once thought, and that the Trinidad howler should be confirmed as a separate species. Co-author Jean Boubli, a University of Salford professor, said the discovery comes "at a critical time, as increasing deforestation, climate change and habitat loss threaten many Amazonian species before they are fully understood or even discovered by science."