A mysterious silk structure in the Amazon known as a "silkhenge" has just been captured in a remarkable, high-resolution new video.
These strange and tiny structures, each small enough to fit on a fingertip, have captivated and perplexed scientists since the first one was discovered in 2013 in Peru, near the Tambopata Research Center. A tapering central cone ringed by delicate silk pillars reminiscent of Stonehenge led to the name.
Video of spiderlings breaking out of the web towers revealed that these strange structures serve as protective fences around spider egg sacs, but the species of spider behind the structures has yet to be identified.
The gorgeous new video was shot by tropical entomologist and science communicator Phil Torres during a recent trip to Peru. Torres was one of the researchers who previously filmed the birth of the golden spiderlings, but further evidence of how and why the spiders make their delicate silkhenges has been maddeningly elusive, he told Live Science.
"It's a thing that keeps me up at night, because it's so annoyingly hard to find. Despite having seen it in so many places I go, the next time, it's like it was never there at all," Torres said. The structures are frequently found on the undersides of broad leaves, but sometimes they show up on bark. They've appeared in flooded habitats, so that's a good place to look for them — except for the times when they appear in habitats that don't flood regularly.
"We have a pretty good idea that they're all over the Amazon basin, in places where only entomologists are looking," Torres said.
In the new video, which Torres shared to YouTube on Jan. 14, he documented a visit in Jan. 2019 to "Silkhenge Island" in Peru, where the first silkhenge was found. But there wasn't a single silk structure in sight. Torres had better luck in a nearby rainforest in March 2019 while leading a tour of the Peruvian Amazon for the travel website Atlas Obscura.
In video captured by a tour member, Torres gently plucked a wide leaf that held a tiny, white ring of silk pillars, holding it up to the camera.
"This hasn't happened in three years!" he said.
High-resolution shots showed remarkable details, revealing strands of silk extending from the central cone to its base. But scientists still don't know whether those strands are structurally important or just leftover filaments from the building process, Torres told Live Science.
The detail captured by the footage could theoretically help arachnologists identify the type of spider by revealing the kind of silk it spins, Torres explained.
These graceful stalks, which form a fence around two or three eggs, could be meant to protect spider babies from parasitic wasps that prey on that species. Indeed, Torres and his colleagues observed such predators emerging from one of the silkhenge cocoons in 2016.
"That could be a sign of what that defense is for — it could be some sort of barrier to a wasp being able to land on it. But clearly, in this case, it didn't work," Torres said.
For now, silkhenge discoveries are few and far between. But each find tells researchers a little more about this mysterious spider architect, Torres added.
"One key thing that we learned this time that I could say for certain is that now we're finding them in clusters. If you find one and you spend enough time looking around that immediate area, you're going to find more," he said. "So, that tells us something about the behavior."
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Originally published on Live Science.
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Mindy Weisberger is an editor at Scholastic and a former Live Science channel editor and senior writer. She has reported on general science, covering climate change, paleontology, biology, and space. Mindy studied film at Columbia University; prior to Live Science she produced, wrote and directed media for the American Museum of Natural History in New York City. Her videos about dinosaurs, astrophysics, biodiversity and evolution appear in museums and science centers worldwide, earning awards such as the CINE Golden Eagle and the Communicator Award of Excellence. Her writing has also appeared in Scientific American, The Washington Post and How It Works Magazine.
It's hard to reconcile the statement (and video) that scientists have witnessed hatchlings in the structures... with the statement " but the species of spider behind the structures has yet to be identified ".Reply
It looks like a satalite dish... complete with antenna transmitter...katkins said:It's hard to reconcile the statement (and video) that scientists have witnessed hatchlings in the structures... with the statement " but the species of spider behind the structures has yet to be identified ".
I remember reading about this a little while back so I don't have the source, but they can't identify the spider for a variety of reasons. They can't determine if this is a completely new spider or if they have discovered how an already known spider lays their eggs. It's hard to tell what species a spider is when it first hatches, but so far sadly all the hatchings they take back to the lab die before they become adults. They've tried checking if the DNA matches any other spiders and so far they have no been able to find a match. This could indicate this is a new spider but they need to see the adult form before coming to that conclusion.Reply
Why is it bizarre? Bizarre would be it floating or making sounds or something. This is just unknown at this point.Reply
While the science involved is intriguing, this story reminds me of E.B. White's marvelous childhood's classic: Charlotte's Web. We read this book in primary school and if you haven't read it, you'll never view spiders the same way again. It is very good.Reply
E.B. White is a terrific author and my wife requested his daughter's E.B. White on Dogs by Martha White. She loved it.
im very arachnaphobic & its bad enough whenever I see one or even more than one in the house so dont want to see it at allReply
sarajo said:im very arachnaphobic & its bad enough whenever I see one or even more than one in the house so dont want to see it at all
Being arachnophobic is a terrible affliction.
Luckily, I am not and I recognize the good that indoor spiders do by catching harmful bugs and flies in their webs.
Two other insects who should be protected are the lady bug and the praying mantis. Both rid the house of insect pests. Stories abound of the mantis being attached to beds with an extremely fine gold chain to protect the sleeper from flying insects.