In 2019, a team working in the cloud forests of Ecuador pulled a thumbnail-sized frog from a bed of moss and realized it matched nothing in the scientific record. It became one of more than 16,000 species formally described that year, a number that would have seemed implausible to biologists a generation earlier. Between 2015 and 2020, taxonomists named new species at a sharply higher rate than in previous decades, according to a large-scale analysis led by University of Arizona evolutionary biologist John Wiens and published in Science Advances. The discovery curve was supposed to be flattening by now. Instead, it is steepening, and the consequences reach far beyond the pages of academic journals.
The numbers behind the surge
Wiens and his colleagues drew on the Catalogue of Life, a global checklist of known organisms maintained with a formal dataset record, to track how many organisms received scientific names in each period from 1800 to 2020. During the final five-year window they examined, the annual average exceeded 16,000 newly described species. That total included more than 10,000 animals, roughly 2,000 plants, and about 2,500 fungi per year.
The oceans account for a significant slice of the increase. A separate peer-reviewed analysis published in Frontiers in Marine Science in 2023, drawing on data through earlier years, calculated that scientists describe approximately 2,332 new marine species each year on average over the period the study examined. Deep-sea invertebrates, microscopic algae, and reef-dwelling organisms remain among the least-documented groups on the planet, which helps explain why the ocean keeps yielding first-time descriptions at such a steady clip.
Individual institutions mirror the global pattern. Scientists at London’s Natural History Museum described 815 new species in 2023, a figure the museum highlighted in its year-end public announcement as a record for its researchers. The haul ranged from parasitic wasps in Southeast Asia to fossil fish in the American West. That breadth matters: the acceleration is not confined to one continent, one habitat, or one branch of the tree of life. It is playing out across multiple kingdoms simultaneously.
Why the curve keeps climbing
Several forces are converging to push the rate higher. Fieldwork has expanded into previously inaccessible terrain, from ultra-deep ocean trenches to high-altitude tropical forests that were, until recently, too remote or too dangerous to survey systematically. At the same time, the global community of trained taxonomists has grown, particularly in biodiversity-rich countries across Latin America, Southeast Asia, and sub-Saharan Africa, where local scientists increasingly lead their own expeditions rather than serving as field assistants for foreign teams.
Technology is almost certainly playing a role as well, though its precise contribution remains hard to quantify. DNA sequencing has become dramatically cheaper and faster over the past two decades, allowing researchers to distinguish species that look nearly identical under a microscope but diverge sharply at the molecular level. The Science Advances study, however, does not break out the proportion of new descriptions that relied primarily on genetic evidence versus traditional morphological examination. Until that breakdown exists, the exact weight of molecular tools in the acceleration is a matter of informed hypothesis rather than settled fact.
What the data does not yet show
The Wiens study covers descriptions through 2020. As of June 2026, no comparable peer-reviewed analysis has compiled global totals for the years 2021 through 2025. The Natural History Museum’s 2023 figure offers a useful institutional snapshot, but a single museum cannot stand in for a worldwide count. Whether the post-2020 rate continued to climb, plateaued during pandemic-related disruptions to fieldwork, or has since resumed its upward trajectory is not yet clear from published research.
Geographic resolution is also limited. The full text of the study examines rates at a broad taxonomic level, but it does not report region-by-region breakdowns in comparable detail. Tropical forests and coral reefs are widely expected to harbor the largest pools of undescribed life, yet confirming that expectation with the same rigor applied to the global totals will require additional, geographically focused analyses.
A race that taxonomy may be losing
The acceleration in discovery collides with an uncomfortable reality: species are also vanishing faster than at any point in recent human history. Habitat destruction, climate change, and pollution are erasing organisms from ecosystems before scientists can collect, examine, and name them. Some researchers estimate that the total number of undescribed species on Earth still runs into the millions. A widely cited 2011 study in PLOS Biology, led by Camilo Mora, put the likely number of eukaryotic species at roughly 8.7 million, of which only about 1.2 million had been formally described at the time.
Even at 16,000 new descriptions a year, the math is sobering. At that pace, cataloguing the remaining millions would take centuries, and the window for many species is measured in decades or less. The gap between what has been named and what actually exists shapes conservation priorities, influences environmental policy, and determines which ecosystems receive legal protection. A species without a name is, for regulatory purposes, invisible.
That is what makes the acceleration documented by Wiens and his colleagues both hopeful and insufficient. Taxonomists are working faster than ever. The question is whether the rest of the world, including funders, governments, and conservation organizations, can match that urgency before the organisms they are racing to describe disappear for good.
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*This article was researched with the help of AI, with human editors creating the final content.
