Researchers have found that scientists are identifying new species faster than ever before, with over 16,000 documented annually. This acceleration reveals Earth's biodiversity to be far richer than previously thought, outpacing extinction rates. The findings, from a University of Arizona study, highlight untapped potential for conservation and innovation.
A study led by John Wiens, a professor in the University of Arizona's Department of Ecology and Evolutionary Biology, and published in Science Advances, demonstrates that the rate of species discovery is at its highest in history. Analyzing taxonomic records of about 2 million species, the researchers determined that between 2015 and 2020, an average of more than 16,000 new species were described each year. This includes over 10,000 animals, primarily arthropods and insects, alongside roughly 2,500 plants and 2,000 fungi.
"Some scientists have suggested that the pace of new species descriptions has slowed down and that this indicates that we are running out of new species to discover, but our results show the opposite," Wiens stated. "In fact, we're finding new species at a faster rate than ever before."
The discovery rate significantly exceeds extinctions, estimated at about 10 species per year based on prior research by Wiens. Projections from the study suggest vastly higher totals than currently known: up to 115,000 fish species compared to 42,000 described, 41,000 amphibians versus 9,000, and over half a million plants. Overall, while around 2.5 million species are documented, the true figure could reach tens or hundreds of millions, or even low billions, particularly for insects, where estimates range from 6 million to 20 million against 1.1 million identified.
Advances in molecular techniques are enabling detection of genetically distinct species that appear similar visually, especially among bacteria and fungi. Wiens emphasized the stakes: "Discovering new species is important because these species can't be protected until they're scientifically described." Beyond conservation, these finds fuel medical progress, such as weight-loss drugs derived from Gila monster hormones, and technological inspirations like gecko-inspired adhesives.
The researchers anticipate continued acceleration, with 15% of all known species described in the past 20 years alone. Future work will map high-discovery regions and examine the global shift in taxonomic research.
