During a guided tour in August 2025, scientist Alexander Bentley encountered a surprising discovery when he prodded what seemed to be a spider covered in a potentially lethal parasitic fungus. Despite the fungus-like appearance, the spider beneath it was alive, defying expectations.
Bentley, a herpetologist from Ecuador known for leading tours in the Amazon rainforest, where cordyceps fungi are prevalent, recognized the significance of the find. Cordyceps, also known as “zombie fungus,” infects insects and arachnids, manipulating them to spread spores in a manner resembling zombie behavior, as documented by the National Library of Medicine.
The spider exhibited tubercles on its abdomen, resembling the hallmark signs of a cordyceps-infected host. Initially, Bentley believed it to be a victim of the fungus. However, further investigation revealed that the spider belonged to a new species that mimics fungi like cordyceps, potentially for predatory advantage or defense.
The revelation, detailed in the scientific journal Zootaxa, has sparked excitement among researchers. Despite skepticism from some quarters about the spider’s resemblance to the fungus, Bentley, along with his colleague David Ricardo Díaz-Guevara, confirmed the spider as a novel species named Taczanowskia waska.
The identification process involved meticulous examination of the spider’s morphology and comparison with existing literature on related species. The collaboration between Bentley and Díaz-Guevara, an arachnid curator, underscores the significance of such discoveries facilitated by platforms like iNaturalist.
The spider’s unique mimicry of fungi has led to speculation about its purpose. It may serve as a hunting strategy, allowing the spider to ambush prey inconspicuously, or act as a defense mechanism against predators. While the true function remains uncertain, experts like mycologist Monika Fischer acknowledge the value of citizen science platforms in facilitating groundbreaking discoveries.
The unusual appearance of the spider has intrigued scientists like Andrew Swafford, who suggests that the spider’s features may not necessarily be a form of camouflage. Further research is needed to elucidate the purpose of the spider’s fungus-like appearance and its evolutionary implications.
Despite encountering various extraordinary species in the rainforest, Bentley considers this discovery of the spider mimicking cordyceps as one of the most remarkable and unique findings in his career.
