Perfectly preserved 310-million-year-old fossilized brain found

This fossilized horseshoe crab (Euproops danae), shown in the left image, held a perfectly preserved mold of its brain, shown close-up in panel B. Panel C shows a reconstruction of Euproops danae, including the position and anatomy of the brain. (Image credit: Russell Bicknell)

Researchers have uncovered a never-before-seen fossilized brain from a 310 million-year-old horseshoe crab, revealing some surprises about the evolution of these wannabe crustaceans, according to a new study.

The fossilized brain, which belongs to the extinct species Euproops danae, was discovered at Mazon Creek in Illinois, where the conditions were just right to perfectly preserve the animal’s delicate soft tissue. 


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