In what can safely be assumed to be horrifying news for arachnophobes around the world, scientists have discovered the beautifully preserved remains of prehistoric “proto-spiders” that sported tails longer than their bodies.
Fossil hunters found the extraordinary creatures suspended in lumps of amber that formed 100 million years ago in what is now Myanmar.
The ancient arachnids are described as “chimeras” after the hybrid beast of Greek mythology, because they have a curious mix of primitive and modern body parts.
Photo: Reuters
While the animals have fangs, twin feelers and silk-producing spinnerets at the rear, they also bear tails that are found in far more ancient spider relatives called uraraneids.
The tail probably swished from side to side as the creature moved to sense for predators and perhaps even prey.
Paul Selden, a paleontologist who worked on the specimens at the University of Kansas, said they were “a kind of missing link” between the uraraneids and primitive living spiders.
Named Chimerarachne yingi, they lived when the huge herbivore Argentinosaurus and the short-armed Rugops, meaning “wrinkle face,” stomped the Earth.
However, there is a chance that descendants of the long-tailed arachnids live on in Southeast Asian forests today, Seldon said.
Amber from Myanmar has been mined for thousands of years and traded with China as jewelery, but while scientists have long studied bugs preserved in the material, they have only recently grasped its true age.
The newfound value of the material means that dealers now buy up the amber and sell it to scientific institutions.
Wang Bo (王博), who worked on the creatures at the Chinese Academy of Sciences in Nanjing, said he was extremely surprised to find such key fossils from the Cretaceous period.
“It’s a very primitive group and their relatives were present more than 250 million years ago,” he said.
Each spider was about 3mm long with a tail measuring up to 5mm.
“Maybe the tail originally had a sensory function; it is covered in short hairs, but when spiders changed to lifestyles like being sit-and-wait predators, the tail was no longer really needed and became lost,” he said.
Harvard University zoologist Gonzalo Giribet said he was not sure why anyone might not find the new species appealing.
“These are gorgeous creatures and would probably never harm a human, like 99.99 percent of the spiders,” he said.
Details of the specimens are published in two papers in the journal Nature Ecology and Evolution.
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