Birdnow's Aviary

January 31, 2020

Scorpion Spider

Timothy Birdnow

This is guaranteed to creep anyone out!

I find all arachnids distasteful, but a combo spider and scorpion? That's just evil.

From the article:

Amber mined for centuries in Myanmar for jewelry is a treasure trove for understanding the evolution of spiders and their other arachnid relatives. This week, two independent teams describe four 100-million-year-old specimens encased in amber that look like a cross between a spider and a scorpion.

[...]

Arachnids are a group of eight-legged invertebrates that includes scorpions, ticks, and spiders. Spiders, which crawled into existence some 300 million years ago, are known for their spinneretsâ€”modified "legsâ€ that produce silk and control its extrusion from tiny pores called spigots.

Male spiders have also evolved another modified "legâ€ between their fangs and the back four pairs of legs that inserts sperm into the female. All but the most primitive spiders have smooth backs, unlike the segmented abdomens of scorpions, which are believed to have diverged from an ancestral arachnid more than 430 million years ago.

But in 1989, researchers discovered a suspicious, spigot-bearing fossil that was 100 million years older than the earliest known spider. By 2008, paleobiologists realized that this ancient silk producer was just a spider relative, perhaps a stepping stone to true spiders. Researchers put it into the group Uraraneida, which was thought to have thrived between 400 million and 250 million years ago. That left unanswered many questions about when spinnerets and other spider traits first evolved.

Then, several years ago, amber fossil dealers independently approached two paleobiologists at the Nanjing Institute of Geology and Paleontology in China with what looked like 5-millimeter-long Uraraneida encased in amber. One of them, Wang Bo, pulled together a team to look at his two specimens, which they eventually named Chimerachne yingi ("chimera spiderâ€ in Latin).

That's about all I can take!

Posted by: Timothy Birdnow at 10:21 AM | Comments (9) | Add Comment
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