The freshwater crabs of Italy, scientifically known as Potamon fluviatile, go back to ancient times when Rome was a marshy valley. They have survived through urbanization and the collapse of the Roman Empire, residing underneath the city in an ancient sewage system. These unique crabs are at risk of disappearing due to declining numbers and increased predation. Researchers hope to secure funds for studying and protecting them, although the city of Rome has resisted implementing measures to safeguard the crabs in favor of preserving views of ancient monuments. The future of Rome’s ancient freshwater crabs remains uncertain, but their existence is truly remarkable.
https://www.nationalgeographic.com/animals/article/river-crab-ancient-rome