A New Species Was Hiding in Plain Sight in Shanghai’s Waterways, Scientists Say
Sometimes the most remarkable discoveries happen in the most ordinary places. Not in a remote jungle or the deep ocean floor, but in a drainage canal on the outskirts of one of the world’s biggest cities.
In August 2024, researchers from Shanghai Ocean University collected water samples from the Nanheng Diversion Canal and nearby waterways on Chongming Island in Shanghai. What they found would take more than a year to confirm — a species of microscopic algae that had never been recorded anywhere on Earth.
The species, a diatom named Tryblionella chongmingensis, was formally described in findings published in the botanical journal Phytotaxa in March 2026.
What Exactly Is a Diatom?
Diatoms are microscopic algae — tiny organisms invisible to the naked eye that live in water. Despite their size, they play an outsized role in aquatic ecosystems. They are primary producers, meaning they form the very foundation of the food chain: plankton feed on them, fish feed on the plankton, birds feed on the fish and so on up the chain. They also hold potential future economic value.
Finding a new one isn’t as simple as spotting an unfamiliar animal in the wild. The research team from the College of Fisheries and Life Science at Shanghai Ocean University spent over one year in systematic comparison with similar species from around the world before they could be certain. They examined the organism’s physical traits — including its relatively large cell size and distinct structural features — and confirmed significant differences from every known species in its genus.
Only then could they declare it: a species previously unrecorded worldwide.
Why This Location Matters
Chongming Island sits in the Yangtze River estuary, where river water meets the sea. It is the third-largest island in China and the largest alluvial island on the planet — meaning it was built entirely from sediment deposited by the Yangtze over time.
The island is surrounded by both riverine and marine waters and has an extensive internal river network. Its predominantly brackish water systems — a blend of fresh and saltwater — create conditions that support high biodiversity and diverse aquatic ecosystems.
That ecological richness is exactly what drew the research team there, according to Zhang Wei, an associate professor at Shanghai Ocean University who led the study.
“The Yangtze River estuary has always been a hot spot for biodiversity — not only for bird and fish species, but also for aquatic life. Such a spot could be home to numerous species, especially the unique ones. Our discovery further proved it, and underscored the estuary’s unique value as a critical habitat for important species,” Wei said.
Zhang noted that increased biodiversity protection efforts have been aiding research and discoveries, and linked the find to Chongming Island’s development as an eco-friendly site.
The Bigger Picture
Perhaps the most striking takeaway from this discovery is what it says about how much remains unknown — even in places humans have lived and worked for centuries.
Wei put it plainly: “Our current understanding of biodiversity is still far from complete. We need to discover more, learn more about them via research, protect them, and ingeniously exploit the biological resources to benefit humanity.”
A new species, hiding in a canal next to a megacity of more than 24 million people. If that doesn’t make you wonder what else is out there waiting to be found, what will?
This article was created by content specialists using various tools, including AI.
