A 260-million-year-old fossil preserves the footprints of a prehistoric spider.. The study didn't stick. In 2009, another team of scientists looked for silky spider footprints on glass and came to a different conclusion. The footprints appeared initially. But when the researchers covered up a spider's abdominal spinnerets, the footprints did not appear — suggesting that silk came from the abdomen, not the feet.
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The spiders were coated in microalgae, which produced a substance that protected the 22.5 million-year-old creepy-crawlies from the ravages of time.. We didn't always know what spider footprints looked like. When paleontologist Raymond Alf (the museum's namesake) retrieved the fossil in 1968, he did some experimenting to determine whether the eight-legged footprints were the work of a spider or a scorpion or something else. "He got some spiders and inked up their little legs on an inkpad and had them run across paper," Farke says.
