Tripedalia maipoensis — New 24-Eyed Box Jellyfish Discovered in Mai Po, Hong Kong.

 Scientists Discover a Tiny Jellyfish With 24 Eyes — and It Lives Right Next to a City

A team of scientists has just discovered an astonishing new species in one of the last places you'd expect-a shrimp pond inside Hong Kong's Mai Po Nature Reserve. The creature, a tiny box jellyfish named Tripedalia maipoensis, stands out for one extraordinary feature: it has 24 eyes.

Measuring only half an inch in length, this jellyfish represents a very rare group of box jellyfish with cube-shaped bodies that are fast swimmers and have quite complex behavior. This finding was published in Zoological Studies and was researched by Professor Qiu Jianwen from Hong Kong Baptist University.

A Tiny Animal with an Amazing Visual System

Tripedalia maipoensis may look deceptively simple, but its biology is anything but.

Like its Caribbean relative Tripedalia cystophora, this species has:

A nearly transparent, cube-shaped bell

Three flat “pedalia” on each corner used in locomotion

Long tentacles reaching up to four inches.

A body only six-tenths of an inch wide

But what really sets it apart is its 24 eyes, which are arranged in four clusters called rhopalia.

Each cluster contains:

2 image-forming eyes that can perceive shapes

Several simple eyes which detect light and dark

Scientists believe that this complex eye system helps the jellyfish navigate, to avoid obstacles, and to hunt prey despite having no central brain.

How Does a Brain-less Jellyfish Learn?

Even more intriguing is what these jellyfish are capable of doing.

Research on its close cousin, Tripedalia cystophora, indicates that these jellyfish are capable of associative learning, in which they remember past experiences and change their behavior accordingly.

For example:

Any time they bump against obstacles,

They adjust their swimming next time,

Showing a form of problem-solving.

Tripedalia maipoensis has not been tested yet, but it is thought by scientists to have similar cognitive abilities.

This challenges what we know about intelligence-proving sophisticated learning can exist even without a traditional brain.

A Concealed Species in a Human-Modified Habitat

But perhaps the most surprising part of this discovery is where it was found.

While Mai Po Nature Reserve has been studied for decades, this tiny jellyfish was living quietly in a shrimp pond near a major city.

This would imply that

Even well-known environments can still hide undiscovered species.

Human-shaped wetlands may be a haven for more life than one might think.

Coastal waters around Hong Kong and China might contain a lot more unknown creatures.

Professor Qiu expressed excitement, saying:

"Discovery of a new species at Mai Po, where quite extensive research has been conducted, indicates how little we know about marine life in the area."

Why This Discovery Matters.

The discovery of Tripedalia maipoensis serves to illustrate how easily small, sensitive species are overlooked-even in regions filled with human activity. More importantly, it revealed just how much biodiversity remains in wetlands, lagoons, and even in water bodies along coastlines.

Most importantly, it reminds us that breakthrough findings don't have to happen in deep oceans or remote jungles. Sometimes, they're hiding in shallow ponds right beside us.