CAMBRIDGE, England, May 8 (UPI) -- A pair of ancient fossilized brains have shed new light on the evolutionary transition from soft to hard bodies among the predecessors of modern arthropods, the group of creatures that includes insects, arachnids and crustaceans.
The two brains, each some 500 million years old, belong to a soft-bodied trilobite and an odd submarine-like creature with the scientific name Odaraia alata. Despite the differences in appearance, researchers found the their brains and the nerves that connect their eye-like features were similarly developed -- suggesting a common ancestor.