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Scientific American
13-08-2025
- Science
- Scientific American
These Spiders Puke Up Toxic Digestive Fluid to Marinate Their Prey Alive
You don't always need a book or movie for a good horror story. Sometimes, if you dare look closely enough, you can find one in your own backyard. Researchers have just confirmed the inner workings of a brutal food-prep technique some spiders use, wrapping their web-snagged prey tightly in silk strands, then puking up toxic digestive fluids to soak the entire package to marinate their meal alive. Spiders from the Uloboridae family, usually just a few millimeters long, have puzzled scientists because they seemed to lack venom—a substance that is widespread among spiders and 'really linked to their evolutionary success,' says Alex Winsor, a neuroethologist at the University of Massachusetts Amherst who wasn't involved in the new research. And there was another mystery. Uloboridae spiders were already known to wrap their prey in hundreds of meters of silk and then regurgitate on them, but researchers hadn't fully pinned down the function of their dramatic vomit. Intrigued, a study team took a closer look at how these predators prepare a snack for themselves. The findings were published in BMC Biology. On supporting science journalism If you're enjoying this article, consider supporting our award-winning journalism by subscribing. By purchasing a subscription you are helping to ensure the future of impactful stories about the discoveries and ideas shaping our world today. By analyzing one species called Uloborus plumipes, the researchers confirmed that these spiders lack venom glands and thus are unable to administer venom in the classic spider way: injecting it into their prey with a fanged bite. But the scientists did find genes actively producing toxinlike proteins in the spiders' digestive system—particularly in the midgut area—and these potential toxins 'appear to be very strong,' says study co-author Giulia Zancolli, an evolutionary biologist at the University of Lausanne in Switzerland. Injecting these digestive fluids into fruit flies in the laboratory proved their high toxicity: just 230 nanograms—billionths of a gram—killed more than half the flies within an hour. The researchers theorize that these spiders do indeed marinate their prey to death this way. Strangely, some spiders from other families that kill with the usual venomous bites are also known to have toxins in their digestive fluids, Zancolli says. This fact raises what she calls a 'fascinating question': What role do these substances play for species outside the Uloboridae family? The study's finding 'solves a puzzle within spider biology,' Winsor says. A next step, he adds, could be to investigate whether digestive-system toxins appear in other animal species, such as some lizards. 'If these compounds do have some special ability to subdue insects, then you might expect them to emerge in other groups of animals,' Winsor says. If that proves true, 'then maybe these are a recurring answer in the animal kingdom.'
Yahoo
15-05-2025
- Science
- Yahoo
This deadly prehistoric wasp captured prey with 'Venus flytrap' abs
In Greek mythology, the sea monster Charybdis swallowed and regurgitated large volumes of water, creating whirlpools powerful enough to drag passing ships to their doom. Ninety-nine million years earlier, in the mid-Cretaceous, the wasp Sirenobethylus charybdis deployed a similar deadly trap that earned it a scientific name inspired by the mythological monster. A Venus flytrap-like structure on the wasp's abdomen held captives in place as the wasp deposited its eggs into its victim, forcing it to incubate its offspring. That's the finding of a new paper published in the journal BMC Biology that examined dozens of wasps entrapped in amber. 'This discovery reveals that ancient insects had already developed sophisticated prey capture strategies,' says Wu Qiong, the lead author and a doctoral student from the College of Life Sciences at Capital Normal University, 'It's reshaping our understanding of parasitic wasp evolution.' The amber containing the specimen Sirenobethylus charybdis is no larger than a dime. In 2015, a Chinese fossil collector purchased these fossils from Myanmar's Kachin state and donated them to Capital Normal University of China. To the naked eye, Sirenobethylus charybdis looks like a modern wasp with a wider-than-average abdomen. 'At first, we attributed this to deformation during preservation, especially since such deformation and distortion is common during fossilization,' says Wu. But under closer inspection—through microscope and CT scans—a remarkable structure was revealed. The abdominal tip of the wasp featured three flaps arranged in a configuration similar to a Venus flytrap. On multiple fossils, the lower flap opened at slightly different angles, suggesting it can move and grab onto things. Just like a Venus flytrap, the underside of the lower flap is also lined with long, flexible hairs that sense movement. When an unsuspecting insect triggered these hairs, it may have activated the swift closure of the abdominal flaps, allowing the wasp to secure the host. Scientists don't think the wasp killed its victims right away but instead used it as a living incubator for its offspring. Numerous stiff, hair-like structures on the upper side of the lower flap, along with the relatively pliable middle flap, would gently but firmly secure the host until the wasp finished laying its eggs. Only then would the wasp release its captive. 'The 'Venus flytrap' structure exhibited by the abdomen of Sirenobethylus charybdis is unprecedented in the entire history of Mesozoic insect research,' says Wu, 'nor has anything similar been documented in living insects.' Chenyang Cai, who was not involved in the study, is a paleoentomologist at Nanjing Institute of Geology and Palaeontology at the Chinese Academy of Sciences. He praised the fossil wasp as a 'unique' discovery. He explained that Sirenobethylus charybdis is 'very different from today's wasps or other insects' and its existence 'highlights the diversity of insects in the mid-Cretaceous period, revealing forms we had never imagined'. Scientists don't know which insects Sirenobethylus charybdis used to host its eggs. Given the small size of its trapping structure, these hosts were possibly tiny, agile insects such as springtails or small flies. By studying similar species living today, the team pieced together other theories about this prehistoric wasp. As a distant relative of Sirenobethylus charybdis, the present-day pincer wasp has also evolved the ability to trap its host—temporarily restraining it, laying eggs, and then releasing it. Female pincer wasps have front legs modified with a pinching apparatus, allowing them to firmly grasp hosts when they lay eggs. These wingless hunters, with large eyes and slender legs, are well adapted for moving swiftly and capturing other insects. In contrast, Sirenobethylus charybdis appears to be more cumbersome. They have smaller eyes and shorter legs, which suggest they were slower than pincer wasps. The grasping structure located at the rear of their body also makes it difficult to capture hosts in motion. Based on these characteristics, researchers think it was a sit-and-wait predator—likely remaining stationary and ambushing hosts that wandered too close. Mid-Cretaceous amber fossils like this one, noted Cai, reveal insects of that age were 'incredibly diverse—perhaps even more specialized in some cases than what we see today.' Such findings, he emphasizes, are 'a crucial reminder that studying only living species will never give us the complete story of evolution.'
National Geographic
15-05-2025
- Science
- National Geographic
This deadly prehistoric wasp captured prey with 'Venus flytrap' abs
In Greek mythology, the sea monster Charybdis swallowed and regurgitated large volumes of water, creating whirlpools powerful enough to drag passing ships to their doom. Ninety-nine million years earlier, in the mid-Cretaceous, the wasp Sirenobethylus charybdis deployed a similar deadly trap that earned it a scientific name inspired by the mythological monster. A Venus flytrap-like structure on the wasp's abdomen held captives in place as the wasp deposited its eggs into its victim, forcing it to incubate its offspring. That's the finding of a new paper published in the journal BMC Biology that examined dozens of wasps entrapped in amber. 'This discovery reveals that ancient insects had already developed sophisticated prey capture strategies,' says Wu Qiong, the lead author and a doctoral student from the College of Life Sciences at Capital Normal University, 'It's reshaping our understanding of parasitic wasp evolution.' The amber containing the specimen Sirenobethylus charybdis is no larger than a dime. In 2015, a Chinese fossil collector purchased these fossils from Myanmar's Kachin state and donated them to Capital Normal University of China. To the naked eye, Sirenobethylus charybdis looks like a modern wasp with a wider-than-average abdomen. 'At first, we attributed this to deformation during preservation, especially since such deformation and distortion is common during fossilization,' says Wu. But under closer inspection—through microscope and CT scans—a remarkable structure was revealed. The abdominal tip of the wasp featured three flaps arranged in a configuration similar to a Venus flytrap. On multiple fossils, the lower flap opened at slightly different angles, suggesting it can move and grab onto things. Just like a Venus flytrap, the underside of the lower flap is also lined with long, flexible hairs that sense movement. A closer examination of the fossil revealed a feature that allowed the wasp to grasp prey, similar to a Venus flytrap. When an unsuspecting insect triggered these hairs, it may have activated the swift closure of the abdominal flaps, allowing the wasp to secure the host. Scientists don't think the wasp killed its victims right away but instead used it as a living incubator for its offspring. Numerous stiff, hair-like structures on the upper side of the lower flap, along with the relatively pliable middle flap, would gently but firmly secure the host until the wasp finished laying its eggs. Only then would the wasp release its captive. 'The 'Venus flytrap' structure exhibited by the abdomen of Sirenobethylus charybdis is unprecedented in the entire history of Mesozoic insect research,' says Wu, 'nor has anything similar been documented in living insects.' Chenyang Cai, who was not involved in the study, is a paleoentomologist at Nanjing Institute of Geology and Palaeontology at the Chinese Academy of Sciences. He praised the fossil wasp as a 'unique' discovery. He explained that Sirenobethylus charybdis is 'very different from today's wasps or other insects' and its existence 'highlights the diversity of insects in the mid-Cretaceous period, revealing forms we had never imagined'. Scientists don't know which insects Sirenobethylus charybdis used to host its eggs. Given the small size of its trapping structure, these hosts were possibly tiny, agile insects such as springtails or small flies. By studying similar species living today, the team pieced together other theories about this prehistoric wasp. As a distant relative of Sirenobethylus charybdis, the present-day pincer wasp has also evolved the ability to trap its host—temporarily restraining it, laying eggs, and then releasing it. Female pincer wasps have front legs modified with a pinching apparatus, allowing them to firmly grasp hosts when they lay eggs. These wingless hunters, with large eyes and slender legs, are well adapted for moving swiftly and capturing other insects. In contrast, Sirenobethylus charybdis appears to be more cumbersome. They have smaller eyes and shorter legs, which suggest they were slower than pincer wasps. The grasping structure located at the rear of their body also makes it difficult to capture hosts in motion. Based on these characteristics, researchers think it was a sit-and-wait predator—likely remaining stationary and ambushing hosts that wandered too close. Mid-Cretaceous amber fossils like this one, noted Cai, reveal insects of that age were 'incredibly diverse—perhaps even more specialized in some cases than what we see today.' Such findings, he emphasizes, are 'a crucial reminder that studying only living species will never give us the complete story of evolution.'
NBC News
31-03-2025
- Science
- NBC News
A Venus flytrap wasp? Scientists uncover an ancient insect preserved in amber that snatched its prey
NEW YORK — An ancient wasp may have zipped among the dinosaurs, with a body like a Venus flytrap to seize and snatch its prey, scientists reported Wednesday. The parasitic wasp's abdomen boasts a set of flappy paddles lined with thin bristles, resembling 'a small bear trap attached to the end of it,' said study co-author Lars Vilhelmsen from the Natural History Museum of Denmark. Scientists uncovered over a dozen female wasps preserved in 99-million-year-old amber from the Kachin region in northern Myanmar. The wasp's flaps and teeth-like hairs resemble the structure of the carnivorous Venus flytrap plant, which snaps shut to digest unsuspecting insects. But the design of the wasp's getup made scientists think its trap was designed to cushion, not crush. Instead, researchers suggested the flytrap-like structure was used to hold a wriggly insect still while the wasp laid an egg, depositing a baby wasp to feed on and drain its new host. It's a playbook adapted by many parasitic wasps, including modern-day cuckoo and bethylid wasps, to exploit insects. But no known wasp or any other insect does so with bizarre flaps quite like this one. 'I've seen a lot of strange insects, but this has to be one of the most peculiar-looking ones I've seen in a while,' said entomologist Lynn Kimsey from the University of California, Davis, who was not involved with the research. Scientists named the new wasp Sirenobethylus Charybdis, partly for the sea monster from Greek mythology that stirred up wild whirlpools by swallowing and expelling water. The new study, which was published in the journal BMC Biology, involved researchers from Capital Normal University and the Beijing Xiachong Amber Museum in China. It's unclear when the wasp went extinct. Studying unusual insects like this one can help scientists understand what insects are capable of and how different they can be. 'We tend to think that the cool things are only found today,' said Gabriel Melo, a wasp expert at the Federal University of Paraná in Brazil, who had no role in the study. 'But when we have this opportunity, we see that many really exceptional, odd things already happened.'
Arab News
30-03-2025
- Science
- Arab News
A Venus flytrap wasp? Scientists uncover an ancient insect preserved in amber that snatched its prey
NEW YORK: An ancient wasp may have zipped among the dinosaurs, with a body like a Venus flytrap to seize and snatch its prey, a new study says. The parasitic wasp's abdomen boasts a set of flappy paddles lined with thin bristles, resembling 'a small bear trap attached to the end of it,' said study co-author Lars Vilhelmsen from the Natural History Museum of Denmark. Scientists uncovered over a dozen female wasps preserved in 99-million-year-old amber from the Kachin region in northern Myanmar. The wasp's flaps and teeth-like hairs resemble the structure of the carnivorous Venus flytrap plant, which snaps shut to digest unsuspecting insects. But the design of the wasp's getup made scientists think its trap was designed to cushion, not crush. Instead, researchers suggested the flytrap-like structure was used to hold a wriggly insect still while the wasp laid an egg, depositing a baby wasp to feed on and drain its new host. It's a playbook adapted by many parasitic wasps, including modern-day cuckoo and bethylid wasps, to exploit insects. But no known wasp or any other insect does so with bizarre flaps quite like this one. 'I've seen a lot of strange insects, but this has to be one of the most peculiar-looking ones I've seen in a while,' said entomologist Lynn Kimsey from the University of California, Davis, who was not involved with the research. Scientists named the new wasp Sirenobethylus charybdis, partly for the sea monster from Greek mythology that stirred up wild whirlpools by swallowing and expelling water. The new study was published in the journal BMC Biology and included researchers from Capital Normal University and the Beijing Xiachong Amber Museum in China. It's unclear when the wasp went extinct. Studying unusual insects like this one can help scientists understand what insects are capable of and how different they can be. 'We tend to think that the cool things are only found today,' said Gabriel Melo, a wasp expert at the Federal University of Paraná in Brazil, who had no role in the study. 'But when we have this opportunity, we see that many really exceptional, odd things already happened.'
