A piece of amber that sat in a museum drawer for years has turned out to hide one of the strangest insects ever found. Researchers at Ludwig Maximilian University of Munich (LMU), working with colleagues at the University of Rostock and the University of Oulu in Finland, announced they have identified a 100-million-year-old true bug with claws that look more like a crab''s pincers than any feature seen on a modern insect.
The fossil is locked inside a piece of Cretaceous-era amber from the Kachin region of Myanmar, an area famous among paleontologists for the astonishing diversity of life it has preserved. Inside the golden resin, the team found a tiny true bug — a member of the order Heteroptera — with front legs that end in massive grasping appendages called chelae. These pincer-like tools function much like forceps and are extraordinarily uncommon in the insect world.
"Previously, such chelae were known from only three insect groups. This fossil therefore represents the fourth known case of these structures evolving independently in insects," explained Privatdozent Carolin Haug, the LMU zoologist who led the research. The team published its findings in the journal Insects.
To study the fossil without breaking the amber, the researchers used micro-computed tomography, a technique that produces extremely detailed 3D X-ray images. The resulting reconstructions let them inspect the bug''s anatomy from every angle, including features that would have been impossible to see with the naked eye.
What they found was remarkable. The team compared the fossil''s claws to more than 2,000 grasping appendages from both living and extinct species, including all the usual insect candidates. The shape didn''t match. Instead, the claws looked closer to those of decapods — crabs, lobsters, and shrimps — and to a group of small crustaceans called tanaids. In other words, this 100-million-year-old true bug had independently invented something very similar to a crab claw.
That kind of convergent evolution — where unrelated lineages stumble onto the same biological solution — is one of the most fascinating patterns in nature. The pincer is such an effective tool for grabbing prey, fighting rivals, and manipulating objects that it has been "reinvented" many times across the tree of life. But within insects, it remains extremely rare.
Because the discovery was so unusual, the researchers placed the fossil into an entirely new genus, naming it Carcinonepa — combining the Latinized Greek word for "crab" (carcino-) with nepa, a reference to the true water bug group Nepomorpha. The species name, libererrantes, is a Latinization of the South Korean K-pop group Stray Kids.
"The name seemed fitting because the posture of the fossil''s chelae strongly resembles the group''s trademark pose," Haug said.
Beyond the playful naming, the discovery adds an important data point for scientists trying to understand how insects diversified during the Cretaceous, the era when flowering plants exploded across the planet and shaped much of modern ecology. Burmese amber has been a particularly rich window into that world, offering snapshots of moments — a beetle mid-step, a flower preserved in mid-bloom, a hunter and its prey caught together — that would otherwise be lost to time.
Carcinonepa libererrantes likely used its oversized claws to grab small prey or anchor itself in vegetation, though its exact habits will remain partly mysterious. What''s certain is that for one moment, 100 million years ago, a curious little bug walked into the wrong drop of tree resin — and gave modern scientists a brand-new branch on the insect family tree.
The researchers say the find is also a reminder of how much remains hidden in fossil collections around the world. With improvements in imaging technology, even specimens that have been on shelves for decades can reveal entirely new species and rewrite parts of evolutionary history.
