Half-billion-year-old parasite still threatens shellfish

500-Million-Year-Old Parasite Still Threatens Shellfish

A recent study has made a surprising discovery about a common parasite infecting modern oysters, revealing it has been infecting bivalves for hundreds of millions of years.

The research, published in iScience, utilized high-resolution 3D scans to examine 480-million-year-old shells from a Moroccan site known for its exceptionally preserved sea life.

The scans revealed distinctive patterns etched on the surface and inside the fossils, which were not random scratches, according to Karma Nanglu, a UC Riverside paleobiologist who led the research.

The marks weren’t random scratches. We saw seven or eight of these perfect question mark shapes on each shell fossil. That’s a pattern.

Rare fossils show that these worms survived multiple mass extinction events, including the one that led to the dinosaurs' extinction.

Author's summary: Ancient parasite still infects shellfish today.

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News - University of California, Riverside News - University of California, Riverside — 2025-11-04

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