They have 24 eyes arranged in four clusters; 16 are simply light-sensitive pits, but one pair in each cluster is complex, with a sophisticated lens, retina, iris and cornea. Trilobites went down a ...

Pairs of eyes are visible on the heads of these trilobites, Cambropallas telesto, from 520 million years ago. Trilobite compound eyes are the earliest well-preserved visual surfaces in the fossil ...

Each eye is about the same volume as the animal's brain. An ancient tower-eyed trilobite with dozens of calcite lenses. Trilobites evolved a wide variety of eye forms. Trilobites lived between 521 and ...

It broke perfectly, as if made for him. And there in one half was a trilobite, its thin eyes gazing up at him. Across 500m years, thrilled to the marrow, he gazed back. He did not need telling ...