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Registered: 07/25/04
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Entomologists are asking the public to report cicadas infested with the zombie cicada fungus. * 1
    #28769210 - 05/10/24 12:22 PM (9 days, 17 hours ago)

Scientists Need Your Help to Find Zombie-Infected Cicadas Filled With Gut Pudding
May 10, 2024 - Gizmodo

Entomologists are asking the public to report sightings of cicadas infested with the parasite Massospora cicadina, better known as the zombie cicada fungus.

If you’re in the mood for a weird scavenger hunt this spring, you’re in luck. Entomologists are asking members of the public to report sightings of adult brood cicadas that have become infested with the parasite Massospora cicadina, also known as the zombie cicada fungus. Those looking will have an easy clue: the abdomens of infested cicadas are steadily filled with a pudding-like fungal plug that can eventually cause their butts and genitals to fall clean off.

There are many sinister parasites in the world, but M. cicadina is definitely one tailor-made for a horror movie. It infests certain cicada species in the Magicicada genus that have much longer life cycles than others—the so-called periodical cicadas of North America that only emerge en masse from the soil every 13 or 17 years at a time, usually between late April to early June. During their brief weeks of remaining life on the surface, these cicadas mate and lay the next generation of eggs that will hatch and burrow themselves into the ground, starting the process over again. Periodical cicadas are grouped into broods, based on their scheduled arrival, though broods are made up of several species.

This year is an especially unique cicada season, since two broods (out of 15 currently active) have emerged: the 17-year Brood XIII, concentrated in Northern Illinois, and the 13-year Brood XIX, which will be much more widespread throughout the southeastern United States. The arrival of these cicadas also means that M. cicadina will make a rare appearance above ground, providing an exciting opportunity for scientists like Matthew Kasson, a professor of forest pathology and mycology at West Virginia University.

“Our fungus is what they call an obligate biotroph, which means that it needs a cicada host to survive. You can’t rear them in the lab, because you can’t rear 17-year cicadas in the lab,” Kasson told Gizmodo over the phone. “So we rely exclusively on harvesting fungal plugs from the backside of infected cicadas that are collected during outbreaks. And it’s critical that we collect as many as we can.”

Like their hosts, M. cicadina has a complicated life cycle, filled with sex and drugs. Some cicadas become infected with the spore form of the fungi as they begin to burrow out of the soil toward adulthood. These cicadas develop a specific type of infection classified as stage I. Stage I infected cicadas will appear normal at first, but after about a week, their lower abdomen—genitals included—begins to rip apart, having been replaced by a mass of whitish fungal tissue. The fungal plugs are filled with spores that can infect healthy cicadas.

Males are more likely than females to lose their abdomen and junk completely, but it doesn’t stop them from trying to mate, and that’s when things somehow get even weirder. Though both sexes get stage I infections that they can spread to others, infected males will try to have sex with any cicada around. In addition to making the usual mating call of males, some infected also begin to act like females, stealing their mating ritual of wing-flapping to entice healthy males into futilely courting them. These rampant orgies don’t help the cicadas any, but they do fuel the parasite’s continued spread.

Scientists still don’t know exactly how the fungus warps the cicadas’ behavior so dramatically, but several years ago Kasson and his colleagues made a key discovery. Once inside a host, M. cicadina seems to produce ample amounts of cathinone, a type of stimulant, which likely plays a big part in keeping the cicadas driven to mate while ignoring any other distractions, such as a missing butt. They also found that other Massospora species that infect annual cicadas can produce psilocybin, the main ingredient in psychedelic mushrooms.

But there’s still so much that we’re in the dark about when it comes to these devious parasites—mysteries that will require plenty of samples for researchers like Kasson to sift through.

There’s a second stage of M. cicadina infection, for instance. These stage II infections still hollow out the cicadas’ abdomen but will now produce thicker-walled resting spores (Kasson describes these fungal plugs as resembling a ‘“creamy pudding”). Stage II male cicadas also no longer turn into pansexual horndogs. The resting spores aren’t intended to infect adult cicadas, but are ticking time bombs that will seed the soil and bide their time to infect the next generation of nymphs unlucky enough to encounter them 13 to 17 years down the road.

Stage II infections are caught from Stage I infected adult cicadas and tend to show up later in the season. But according to Kasson, the exact details behind the transition from Stage I to Stage II infections are still unclear. It’s not known whether adult cicadas can catch Stage I infections from other infected adults if caught early enough in the season, for instance, or if a Stage I infection will always cause a stage II infection.

Another lingering question concerns the cicada broods. The team’s earlier analysis found evidence that the M. cicadina parasites infecting 13-year cicadas are slightly different on a genetic level from the M. cicadina infecting 17-year cicadas. That leaves open the possibility that these two groups of parasites are actually two different species. But since there are much fewer 13-year broods around today (only three out of 15), Kasson’s team has only had limited samples to work with to date. The next 13-year brood after this one won’t arrive until 2027, so the researchers are currently hoping to nab as many as these cicadas as they can.

“We really have to be opportunists and take advantage of these emergences when we can,” Kasson noted.

In the last few weeks, Kasson has made a call out to the public through social media. The ask is simple enough: People who come across likely infected cicadas should photograph and upload their pictures though either iNaturalist or the more specific CicadaSafari. They can also get in touch with Kasson directly through his X/Twitter handle @imperfectfunguy. While Kasson’s team is most eager to collect actual specimens, no observation is too small.

One thing you shouldn’t do if you see a fungal-infected cicada is try to eat their gut pudding—a real possibility that Kasson has had to warn overly curious people against, especially those interested in the stimulants found inside.

“The cathinone we found in the cicadas was just one of 1,000 different compounds we found that were tied specifically to the fungus. And if you were to eat the plugs, you might find mycotoxins, bacteria, nematodes, or other microbes that could be really harmful to you,” he said. “So I would say probably not worth the risk.”

The mind control zombie fungus that infects cicadas


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