It’s the stuff of prehistoric nightmares.

Eight legs. Fangs. And a whip-like tail.

Call it Chimerarachne yingi, a newly discovered arachnid that crawled around rain forests in what is now Southeast Asia more than 100 million years ago during the Cretaceous period. Its remains were found imprisoned in amber, as if Mother Nature herself tried to lock this tiny terror away from the rest of the world.

Two different teams of researchers discovered four specimens of the new species in the amber markets of Myanmar. Their findings were published in two separate papers on Monday in the journal Nature Ecology & Evolution.

“The material is stunning in the quality of its preservation,” said Greg Edgecombe, an invertebrate paleobiologist at the Natural History Museum in London, who was not involved in the study. “It throws up a combination of characters that initially seems alien to an arachnologist.”

[READ: Ticks Trapped in Amber Were Likely Sucking Dinosaur Blood]

C. yingi is not a spider, but rather a relative that lived alongside ancient spiders for millions of years. Its discovery provides insight into the evolutionary history of the creepy crawlers that have spun webs around the planet.