After 110 Million Years, This Spider Fossil's Eyes Are All Aglow

© Changkun Park, Electron Probe Micro Analyzer, Korea Polar Research Institute
© Changkun Park, Electron Probe Micro Analyzer, Korea Polar Research Institute

A big, hairy spider is enough to give anyone a fright. So you can imagine what a set of eight glowing eyes attached to a body like that might do to an arachnophobe's psyche. One such spider was discovered recently by researchers, but don’t worry—the iridescent-eyed arachnid has been dead for 110 million years.

As Popular Science reports, this rare, fossilized specimen was found in South Korea’s Lower Cretaceous Jinju Formation. The find was unusual for a couple of reasons. For one, spiders are not usually preserved in rock because the soft-bodied creatures decay easily. It’s also not every day that you see a long-dead spider with glowing eyes. On top of that, researchers found two well-preserved examples of these spiders, which were described in a recent issue of the Journal of Systematic Palaeontology.

Both specimens belong to Lagonomegopidae, an extinct family that predated jumping spiders. The glow is caused by a layer of tissue called tapetum lucidum, which coats the spider’s eyes and reflects light, allowing the spider to hunt at night with ease. Many animals have it—including cats, dogs, horses, deer, raccoons, and some modern spiders—but this is the first paper to describe its existence in a fossilized spider. The tapetum is crescent-shaped and “looks a bit like a Canadian canoe,” according to Paul Selden, a geology professor at the University of Kansas and co-author of the paper.

“Because these spiders were preserved in strange silvery flecks on dark rock, what was immediately obvious was their rather large eyes brightly marked with crescentic features,” Selden said in a statement.

The fossilized spider
Paul Selden

Researchers now want to go back and take another look at similar spiders preserved in amber, which are far more common than spiders fossilized in rock. The challenge is determining whether those specimens also have a layer of tapetum lucidum coating their eyes.

“Amber fossils are beautiful, they look wonderful, but they preserve things in a different way,” Selden said. “Now, we want to go back and look at the amber fossils and see if we can find the tapetum, which stares out at you from rock fossils but isn’t so obvious in amber ones because the mode of preservation is so different.”

[h/t Popular Science]

Mastodon Bones Have Been Discovered by Sewer Workers in Indiana

Thomas Quine, Flickr // CC BY 2.0
Thomas Quine, Flickr // CC BY 2.0

When something unexpected happens during a sewer system project, the news is not usually pleasant. But when workers installing pipes in Seymour, Indiana stopped due to an unforeseen occurrence, it was because they had inadvertently dug up a few pieces of history: mastodon bones.

According to the Louisville Courier Journal, workers fiddling with pipes running through a vacant, privately owned farm in Jackson County happened across the animal bones during their excavation of the property. The fossils—part of a jaw, a partial tusk, two leg bones, a vertebrae, a joint, some teeth, and a partial skull—were verified as belonging to a mastodon by Ron Richards, the senior research curator of paleobiology for the Indiana State Museum and Historic Sites. The mastodon, which resembled a wooly mammoth and thrived during the Ice Age, probably stood over 9 feet tall and weighed more than 12,000 pounds.

The owners of the farm, the Nehrt and Schepman families, plan to donate the bones to the Indiana State Museum in Indianapolis if the museum committee decides to accept them. Previously, mastodon bones were found in Jackson County in 1928 and 1949. The remains of “Fred the Mastodon” were discovered near Fort Wayne in 1998.

[h/t Louisville Courier Journal]

Middle School Student Discovers Megalodon Tooth Fossil on Spring Break

iStock.com/Mark Kostich
iStock.com/Mark Kostich

A few million years ago, the megalodon was the most formidable shark in the sea, with jaws spanning up to 11 feet wide and a stronger bite than a T. Rex. Today the only things left of the supersized sharks are fossils, and a middle school student recently discovered one on a trip to the beach, WECT reports.

Avery Fauth was spending spring break with her family at North Topsail Beach in North Carolina when she noticed something buried in the sand. She dug it up and uncovered a shark tooth the length of her palm. She immediately knew she had found something special, and screamed to get her family's attention.

Her father recognized the megalodon tooth: He had been searching for one for 25 years and had even taught his three daughters to scour the sand for shark teeth whenever they went to the beach. Avery and her sisters found a few more shark teeth that day from great whites, but her megalodon fossil was by far the most impressive treasure from the outing.

Megalodons dominated seas for 20 million years before suddenly dying out 3 million years ago. They grew between 43 and 82 feet long and had teeth that were up to 7.5 inches long—over twice the size of a great white's teeth. They're thought to be the largest sharks that ever lived.

Megalodon teeth have been discovered on every continent except Antarctica, but they're still a rare find. Avery Fauth plans to keep her fossil in a special box at home.

[h/t WECT]

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