Experts uncover 530-million-year-old trilobite fossil

An 'exceptional' 530-million-year-old fossil contains what could be the oldest eye ever discovered, according to researchers.

The remains of the extinct sea creature include an early form of the eye seen in many of today's animals, including crabs, bees and dragonflies.

Experts made the find while examining the well-preserved fossil of a hard-shelled species called a trilobite.

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An 'exceptional' 530-million-year-old fossil contains what could be the oldest eye ever discovered, according to researchers. Experts made the find while examining the well-preserved fossil of a hard-shelled species called a trilobite

An 'exceptional' 530-million-year-old fossil contains what could be the oldest eye ever discovered, according to researchers. Experts made the find while examining the well-preserved fossil of a hard-shelled species called a trilobite

TRILOBITE'S EYES 

The right eye of the fossil was partly worn away, giving researchers a clear view inside the organ.

This revealed details of the eye's structure and function, and how it differs from modern compound eyes.

The species had poor vision compared with many animals today but it could identify predators and obstacles in its path, researchers say.

Its eye consists of approximately 100 ommatidia, which are situated relatively far apart compared to contemporary compounds eyes, the team says.

Unlike modern compound eyes, the fossil's eye does not have a lens.

This is likely because the primitive species - called Schmidtiellus reetae - lacked parts of the shell needed for lens formation.

Experts from the University of Edinburgh were among the team that made the discovery on a fossil that was unearthed in Estonia.

These ancestors of spiders and crabs lived in coastal waters during the Palaeozoic era, between 541 and 251 million years ago.

They found the ancient creature had a primitive form of compound eye, an optical organ that consists of arrays of tiny visual cells, called ommatidia, similar to those of present-day bees.

Researchers believe their findings suggest compound eyes have changed little over 500 million years.

Professor Euan Clarkson, of the university's school of geosciences, said: 'This exceptional fossil shows us how early animals saw the world around them hundreds of millions of years ago.

'Remarkably, it also reveals that the structure and function of compound eyes has barely changed in half a billion years.'

The right eye of the fossil was partly worn away, giving researchers a clear view inside the organ.

The right eye of the fossil was partly worn away, giving researchers a clear view inside the organ. This image shows a side view of the eye

The right eye of the fossil was partly worn away, giving researchers a clear view inside the organ. This image shows a side view of the eye

The remains of the extinct sea creature include an early form of the eye seen in many of today's animals, including crabs, bees and dragonflies. This image shows the full fossil

The remains of the extinct sea creature include an early form of the eye seen in many

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