A Horn-Shaped Fungus That Hunts Zombie Fungus Found in Borneo

Deep in the rainforest of Borneo, scientists pulled a dead ant off the forest floor and found something no one had ever recorded before. The ant had been killed by the notorious "zombie fungus." But sprouting out of that fungus was a second, stranger growth shaped like a tiny horn. It was a parasite feeding on a parasite, and it turned out to be entirely new to science.

Researchers have named it Pleurocordyceps cornusynnemata, and they describe it as the world's first member of its genus to carry this distinctive horn-shaped structure. The find, made in Malaysia's slice of Borneo, reads like something out of a horror film. The reality is even more interesting.

A parasite that hunts a parasite

Most people have a rough idea of how a parasite works: one organism lives off another. A hyperparasite takes that idea one level deeper. It is a parasite of a parasite, and that is exactly what this new fungus is.

The story starts with a far more famous organism, Ophiocordyceps, popularly called the zombie fungus. It infects insects such as ants, hijacks their behaviour, drives them to a final resting spot, kills them, and then bursts out of the carcass to release its spores. The ant becomes little more than a launchpad for the fungus to spread.

Pleurocordyceps cornusynnemata does not bother with the ant's brain at all. Instead of taking over the insect's nervous system the way the zombie fungus does, it goes straight for the zombie fungus itself, infiltrating and feeding on the living fungal tissue inside the dead host. In the words of the research team, it "effectively parasitizes the primary pathogen." The hunter becomes the hunted.

What the horn actually is

The name is a clue. "Cornu" points to the horn, and "synnemata" refers to a synnema, a clustered, stalk-like structure that some fungi push up to carry their spores. Put together, the species name describes a fungus that grows these spore-bearing stalks in a striking, horn-like form.

That shape is the headline. Other species in the Pleurocordyceps genus exist, but according to the team this is the first known one to show off this highly distinct horn-shaped structure. In a group of organisms where new species are often separated by tiny technical differences, having a feature you can almost see with the naked eye is unusual.

Found in one of Earth's richest rainforests

The discovery came out of the Danum Valley in southern Sabah, on the island of Borneo. This is not a random patch of jungle. Danum Valley is a protected conservation area and one of the most biodiverse rainforests on the planet, a place where scientists regularly turn up species new to science.

The work was carried out by researchers from the University of Malaysia Sabah's Institute for Tropical Biology and Conservation, and the new species was described in the taxonomy journal Phytotaxa in April 2026. The team's deputy director, Jaya Seelan Sathiya Seelan, was among those behind the find, which came together across multiple field trips into the forest.

The same fieldwork reportedly turned up another oddity: a separate, newly identified fungus that targets spiders. Borneo, in other words, is still handing scientists surprises that most of us would never imagine exist.

Why a single fungus matters

It would be easy to file this under "weird nature" and move on. That would miss the point. Fungi in this family are a known treasure chest for medicine and agriculture, and a hyperparasite is a particularly intriguing addition.

Here is why specialists are paying attention:

• New medicines. Fungi that attack other fungi often produce powerful compounds to win that chemical war. Those compounds are exactly the kind of thing researchers screen when hunting for next-generation antimicrobial drugs, at a time when drug-resistant infections are a growing global threat.
• Natural pest control. A fungus that can knock back another fungus, or insects, hints at possible biocontrol agents that could one day reduce reliance on synthetic chemicals on farms.
• Healthier ecosystems. Hyperparasites act as a natural check on their hosts. By keeping the zombie fungus in balance, organisms like this quietly help regulate insect populations across the forest.

None of this is a finished product. It is a starting point. But every useful fungal drug began as an obscure organism someone bothered to describe properly.

The Cordyceps you may already know

If the name Cordyceps rings a bell, there are two likely reasons. The first is pop culture. The hit series The Last of Us built its apocalypse on a fictional version of this real zombie fungus. The crucial real-world caveat: these fungi are finely tuned to insects, and our body temperature is simply too high for them to take hold. They are not going to turn humans into anything.

The second reason is closer to home for many readers. A relative of these fungi, the prized Himalayan Cordyceps known in parts of India as keeda jadi and in the wider region as yarsagumba, is one of the most expensive natural products on Earth, harvested for traditional remedies and tonics. It too grows out of an insect host, in that case a caterpillar buried in high-altitude soil. The family tree behind a luxury health product and a Borneo horror story is, remarkably, the same one.

What happens next

Naming a species is only the opening chapter. With Pleurocordyceps cornusynnemata formally described, the obvious next steps are to study how common it is, how it pulls off its attack on the zombie fungus at a chemical level, and whether any of those compounds are worth a closer look in the lab.

There is a bigger lesson tucked inside this single ant. The discovery is a reminder of how much of life remains undocumented, especially fungi, which are vastly under-studied compared with animals and plants. It also underlines why protected rainforests like Danum Valley are worth fighting for. You cannot find what you have already bulldozed.

A horn-shaped fungus eating a brain-hijacking fungus inside a dead ant sounds invented. It is not. It was simply waiting in the forest for someone to look closely, which is reason enough to keep looking.