Scientists have identified the earliest known evidence of spider fangs in a 518 million-year-old fossil recovered from southern China, tracing the origin of one of the animal kingdom's most feared biological tools back to a small marine creature that lived long before spiders existed. The fossil belongs to a species called Urokodia aequalis, examined by researchers from Yunnan University and the University of Leicester using X-ray imaging techniques that revealed soft tissue structures preserved inside the rock. The findings, published in the journal Nature, show that pincer-like limbs on this ancient animal represent the earliest known stage in the evolution of chelicerae, the specialised front limbs that eventually developed into the fangs of spiders and the pincers of scorpions. It's a rare thing to catch evolution mid-sentence like this, a small pincer on a two-centimetre sea creature slowly becoming, over hundreds of millions of years, the fang now feared in gardens and basements everywhere.
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