Researchers exploring Ecuador’s Amazon rainforest thought they spotted a tiny mushroom clinging to the underside of a leaf during a nighttime survey. On closer inspection something very strange came to light. This was a spider that disguised itself as a parasitic fungus so convincingly that it fooled even experienced scientists.Newly identified species named tacznowskia waskaThe first known spider to mimic a fungus that infects spiders. The discovery, made by an international team of researchers including scientists from the Leibniz Institute for the Analysis of Biodiversity Change (LIB), has been published in the journal Nature. zootaxa.The spider was discovered in the Longanes-Sangay corridor in the Ecuadorian Amazon, a region considered one of the most biologically rich places on Earth. During a nighttime field expedition, researchers initially thought they were looking at a mushroom growing under a leaf, but later realized it was a living spider.The misidentification became one of the strongest clues that the species had evolved unusually effective camouflage.
A spider that looks like a parasitic fungus
Unlike most spiders, which burrow into bark, leaves or flowers, tacznowskia waska has evolved to resemble the fruiting bodies of fungi belonging to the genus Gibellula. These fungi are well known because they grow on spiders after they infect and kill them.The resemblance is amazing.The color of the spider is light yellow and there are long structures extending from the stomach, which give the impression of growth of fungus in it. It also behaves in a way that reinforces the illusion. Instead of actively moving around in search of prey, it remains completely motionless on the underside of the leaves, right there Gibellula Fungi are commonly found in rainforests.According to the researchers, the combination of appearance and behavior points to a highly specialized form of mimicry that has never been recorded before in spiders.Disguise can help the spider avoid predators, as it appears so that they will ignore it. Also, by remaining unnoticed it can attack unsuspecting prey more effectively.
first time for science
study describes tacznowskia waska This is the first recorded example of a spider mimicking a parasitic fungus that infects its own species.This makes the discovery significant beyond the description of a new species. It also provides scientists with fresh evidence of how mimicry may have evolved in nature and the different ecological roles such adaptations may play.The researchers say the discovery expands the current understanding of survival strategies among spiders and raises new questions about how similar forms of mimicry may have evolved in other rainforest species that have not yet been studied.belongs to the spider species tacznoskiiaA group that is considered both rare and little understood. Members of the genus are rarely encountered in the wild, leaving much of their ecology and behavior unknown.
An unexpected discovery with the help of citizen scientists
The discovery did not begin in a laboratory or during a planned discovery of a new species.Instead, it started with an observation uploaded to the citizen science platform iNaturalist. What observers believed to be a mushroom attracted the attention of users on the forum, who recognized that the unusual object may actually be a spider.That online observation inspired scientists to investigate further, ultimately leading to the formal identification of a species that had never been described before.Researchers say this case shows how members of the public can play an important role in biodiversity research, especially in remote areas where many species are undocumented.Nadine Duperre from the Museum of Nature Hamburg at LIB contributed to the research by examining reference specimens held in scientific collections and helping to classify the newly discovered spider.“Discoveries like this demonstrate the value of scientific collections. They enable us to classify new species and compare them with historical specimens. Combined with international collaboration and citizen science, this opens up new opportunities for research on biodiversity,” explains Nadine Duperre.
Why is it so unusual for fungi to mimic?
Mimicry is common in nature, but this case is different because the spider is not copying a plant, leaf or harmless object. It is mimicking a parasitic fungus that infects other spiders.belongs to the fungal family Gibellula. It is known to grow on spiders after infection, eventually causing yellow, stalk-like structures to emerge from the host’s body. These fungal growths are often found attached to the undersides of leaves in humid rainforest environments.similarity created by tacznowskia waska So close that researchers initially failed to identify it as an animal during fieldwork. The shape of the spider’s body and yellow, fungus-like extensions closely match the appearance of infected spiders Gibellula.Its behavior adds another layer to the disguise. By remaining motionless in the same position where infected spiders are usually found, it reinforces the illusion that it is not alive in the usual sense.Researchers believe that this combination of physical appearance and behavior may serve two purposes. This may help the spider avoid detection by predators who learn to ignore fungus-infected prey. This may also allow it to attack insects that come too close, mistaking them for some inedible object.
A rare species still largely unknown
belongs to the spider species tacznoskiiaA group that is rarely studied. Scientists rarely encounter members of this species in the wild, leaving major gaps in our understanding of their behavior, distribution, and ecological role.Because of this, each new discovery adds important details to a group that is still largely undocumented. The discovery of a species with such a distinctive form of mimicry has raised further questions about how diverse survival strategies may be within this genus.
Found through citizen observation
The series of discoveries began far away from formal research settings. An image uploaded to citizen science platform iNaturalist shows what appears to be a mushroom on a leaf in an Ecuadorian rainforest.Users on the platform questioned that interpretation, suggesting it could be an animal. That discussion inspired intensive scientific investigation, ultimately leading to field confirmation and formal classification of a new species.This case reinforces the growing role of citizen science in biodiversity research, especially in remote ecosystems where scientific surveys are limited.
Amazon biodiversity and scientific collaboration
The spider was found in the Langanetes-Sange corridor, an extension of Ecuador’s Amazon rainforest known for its high levels of biodiversity and limited scientific exploration. The region continues to produce new species across diverse groups of organisms, from insects to plants and fungi.The research team involved in the discovery included international collaborators as well as scientists from the Leibniz Institute for the Analysis of Biodiversity Change (LIB). Museum collections also played an important role, helping researchers compare specimens and confirm the spider’s classification.Nadine Duperre from the Museum of Nature Hamburg at LIB contributed by examining preserved specimens and assisting with the taxonomic work that described the species as new to science.
Publication details
The findings were published in the journal zootaxa In 2026 under the heading: “The Cordyceps Spider”: Taczanowski Waska sp. Nov. (Araneae: Araneidae), a new spider species and a new case of mimicry of an araneopathogenic fungus (Cordycepsaceae: Gibellula)..study describes tacznowskia waska The first documented case of a spider mimicking a parasitic fungus infecting the spiders themselves, a form of mimicry not previously recorded in arachnids. This discovery adds to the growing evidence that rainforest ecosystems still contain complex and unpredictable evolutionary strategies, many of which are undocumented.During fieldwork, researchers observed that the animal was so attractive in its disguise that it was initially mistaken for a mushroom, but upon closer inspection its true identity was revealed to be a spider.