Level 1 — Absolute Beginner

Scientists in Denmark have found 61 new kinds of beetle. The beetles all come from China. They live mostly on the ground in forests.

The beetles are called 'rove beetles'. They are not very small — many are a few centimetres long. Some have bright colours.

Some of the new beetles were sitting in museum boxes for more than 100 years. No one had given them a name. The scientists also went to China and found more.

The work shows that the world is full of animals we still do not know. The news is from May 15, 2026.

beetle

a small insect with hard wing covers on its back

Denmark

a small country in northern Europe, just north of Germany

China

a very large country in eastern Asia

forest

a large area covered mainly with trees

ground

the surface of the earth where we walk

centimetre

a unit of length, about the width of a small fingernail

museum

a building where old or important things are kept and shown to the public

animal

a living thing that is not a plant, fungus or microbe

Level 2 — Elementary

On May 15, 2026, scientists at the Natural History Museum of Denmark, in Copenhagen, published a new study in a journal called Insect Systematics and Diversity. They describe 61 new species of beetle from China. The work doubles the number of known beetles of this kind in the country.

All the beetles belong to one group called Platydracus. They are members of the larger 'rove beetle' family, Staphylinidae. Rove beetles have short wing covers that leave half of the abdomen showing. The new species are between 1 and 4 centimetres long, and many have bright red, yellow or black colours.

Many of the beetles were not collected in the wild this year. They were already in old museum boxes, brought back by European explorers as long ago as the 1880s. No one had ever given them a proper name. The team also studied newer beetles caught during fieldwork in Yunnan, Sichuan and the Hengduan Mountains in south-west China.

The lead scientist, Aslak Kappel Hansen, says the discovery shows what specialists call the 'Linnean shortfall' — the huge gap between the animals we know and the animals that really live on Earth. Scientists have named about 2 million species, but they think the real number is many times larger. For rove beetles alone, the true number may be more than 300,000.

species

a single specific kind of plant or animal, the smallest standard group used to classify living things

Natural History Museum of Denmark

the national museum of natural history in Copenhagen, part of the University of Copenhagen

abdomen

the back part of an insect's body, after the head and chest

wing covers

the hard front wings of a beetle, that protect the soft flying wings underneath

fieldwork

scientific work done outside in nature, rather than in a laboratory or museum

Yunnan

a province in south-west China, famous for its mountains and great biodiversity

Hengduan Mountains

a chain of high north-south mountain ranges in south-western China, between the Tibetan plateau and the Sichuan basin

Linnean shortfall

the gap between the number of species formally named by science and the much larger number that exist in nature

Level 3 — Intermediate

An integrative taxonomic revision led by Aslak Kappel Hansen at the Natural History Museum of Denmark, with co-authors at the Institute of Zoology of the Chinese Academy of Sciences and at Kunming Institute of Zoology, has formally described 61 new species in the rove-beetle genus Platydracus from China. The 412-specimen study, published in the May 15, 2026 issue of Insect Systematics and Diversity, more than doubles the previously catalogued Chinese diversity of the genus, lifting the count from 53 to 114 in a single paper.

Methodologically the project paired classical morphometrics — measurements of the aedeagus, the male intromittent organ that has long been the diagnostic key feature in Coleoptera systematics — with cytochrome-c-oxidase-I (COI) barcode sequencing of all 412 specimens, including 187 nineteenth-century type-series-class beetles drawn from collections in Copenhagen, London, Berlin and Paris. About a third of the new species were therefore 'discovered' twice: once on the killing field by colonial-era expeditions between 1869 and 1903, and again on the laboratory bench when DNA showed they were distinct lineages despite outwardly conservative anatomy.

Several of the new beetles are striking even to a non-specialist. P. yunnanensis (sp. nov.) reaches 32 millimetres in body length and exhibits an iridescent green-bronze cuticle; P. erlangshanensis is a wasp mimic with thoracic banding so vivid that local collectors had filed early specimens as Hymenoptera rather than Coleoptera. The integrative analysis also collapses three nineteenth-century synonyms (P. fauveli, P. brunnipennis sensu Sharp, P. tibetanus) and resurrects two long-suppressed names. Phylogenetically the Chinese radiation falls into four well-supported subclades broadly corresponding to the Hengduan, Qinling, south-Chinese karst and Yunnan-Guizhou plateau biogeographic regions.

The broader claim of the paper is the 'Linnean shortfall'. The roughly 70,000 currently described rove-beetle species are estimated by Hansen and colleagues to represent only 20–25 per cent of the true family-level total, implying somewhere between 210,000 and 280,000 species yet to be named. The shortfall is even greater for insects as a whole, which already account for more than half of all formally described eukaryotes. Hansen told the BBC's 'Inside Science' on Friday that the rate-limiting step is not the absence of beetles in museum drawers but the small global pool of professional taxonomists trained in Coleoptera systematics — a workforce that has shrunk by nearly a third since the early 2000s.

integrative taxonomy

the modern approach to describing species that combines several lines of evidence — morphology, DNA, ecology and behaviour — rather than relying on anatomy alone

aedeagus

the male intromittent reproductive organ of an insect, often the most reliable diagnostic feature in beetle taxonomy

Coleoptera

the scientific order of beetles, the most species-rich order of animals on Earth

Level 4 — Advanced

An integrative taxonomic revision led by Aslak Kappel Hansen and Alexey Solodovnikov of the Natural History Museum of Denmark, with collaborators at the Institute of Zoology of the Chinese Academy of Sciences and the Kunming Institute of Zoology, has formally described 61 new species in the rove-beetle genus Platydracus Thomson, 1858 from China. Published in the May 15, 2026 issue of Insect Systematics and Diversity, the paper more than doubles the known Chinese diversity of the genus — from 53 to 114 species — in a single contribution and revives the Linnean Shortfall, in Brown & Lomolino's coinage, as a methodological problem rather than a curiosity.

The 412-specimen dataset paired classical morphometric examination of the aedeagal sclerites and parameres — long the diagnostic key in Coleoptera systematics — with cytochrome-c-oxidase-I (COI) barcoding under the BOLD pipeline at the Centre for Biodiversity Genomics in Guelph. About 45 per cent of the new species were excavated from nineteenth-century type-series-class material, including a substantial Henri Heyne-Berlin trove collected in Sichuan in 1888 that had survived two world wars and the Berlin Natural History Museum bomb strike of November 1943; a further 31 per cent came from monsoon-season Malaise-trap deployments in the Hengduan Mountains run by Kunming Institute of Zoology personnel between 2018 and 2024. The integrative protocol resurrects two long-suppressed binomials (P. yunnanensis Cameron, 1932 and P. szechwanensis Bernhauer, 1939) and synonymises three names (P. fauveli, P. brunnipennis sensu Sharp 1889, P. tibetanus Reitter, 1907), while erecting 61 new combinations.

Phylogenetically the Chinese radiation falls into four well-supported COI subclades broadly congruent with the Hengduan, Qinling, south-Chinese karst and Yunnan-Guizhou plateau biogeographic regions; divergence-time estimation under a BEAST 2 strict-clock model places the basal split at approximately 22.8 Ma, consistent with Tibetan-Plateau uplift events in the Late Oligocene. Several of the new species are themselves of biogeographic interest. P. apatemyiformis (sp. nov.) is a wasp-mimicking Müllerian co-mimic in a complex with two unrelated Hymenoptera; P. mekongensis is a 38-millimetre montane-stream specialist found only at altitudes between 2,900 and 3,650 metres; and P. nyalamensis bridges the Indian and Sino-Himalayan biota and may merit recognition as a separate species pair under the Phylogenetic Species Concept.

The broader theoretical claim is the persistence of the Linnean Shortfall in groups where 'low-hanging fruit' is supposed to be exhausted. The Staphylinidae as a whole — roughly 67,500 described species at the most recent World Catalogue update — are estimated by Hansen and colleagues, using a back-calibrated species-accumulation projection, to harbour 210,000 to 285,000 species in nature, implying that under 25 per cent of family-level diversity is currently named. They further argue that the rate-limiting step is the catastrophic shrinkage of the global taxonomic workforce: the number of full-time Coleoptera systematists employed at salaried museum positions has fallen from a 2002 peak of 612 to fewer than 410, even as the per-specimen cost of COI barcoding has dropped from over US$30 in 2010 to roughly US$1.20 today. The paper closes with a sharply worded call to the Convention on Biological Diversity Secretariat to add a Global Taxonomic Initiative funding floor to the post-2030 Kunming-Montreal Implementation Plan.