Scientists Uncover 125-Million-Year-Old Pregnant Mussel Fossil, Pushing Back Brooding Behavior
Updated
Updated · ScienceAlert · Jul 5
Scientists Uncover 125-Million-Year-Old Pregnant Mussel Fossil, Pushing Back Brooding Behavior
1 articles · Updated · ScienceAlert · Jul 5
Summary
A 125-million-year-old freshwater bivalve fossil from England’s Isle of Wight preserved soft tissues and tiny young, giving researchers the earliest direct evidence of brood care in these shellfish.
The Scientific Reports study says the specimen shows a complex reproductive strategy—fertilized eggs developing in a gill brood chamber with maternal calcium support—was already established in the Early Cretaceous.
Researchers identified the species as Margaritifera valdensis, related to modern freshwater pearl mussels whose larvae later parasitize fish before dropping off to form new mussel beds.
The find also explains the long-mysterious material called “molluskite,” which the team says is exceptionally mineral-preserved soft tissue and reproductive structures.
The discovery adds evolutionary context for how freshwater mussels adapted to rivers and lakes, while underscoring concern for modern relatives threatened by pollution, construction and climate change.