Trilobites had a hidden third eye, new fossils reveal

Trilobites, a group of extinct marine arthropods, had a hidden third eye — and sometimes even a fourth or fifth, new research suggests.

Paleontologists knew that, like other arthropods such as insects and spiders, these hard-shelled prehistoric sea creatures had a pair of compound eyes, which they used to see during the Paleozoic Era (541 million to 252 million years ago). 

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