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Amazon Spider Disguises Itself as Spider-Killing Fungus

Scientists say the newly described species shows animals can mimic disease organisms and could change how researchers search for cryptic camouflage

In the Amazon canopy a newly named spider called Taczanowskia waska was found mimicking not another animal but a parasitic fungus, copying both how the fungus looks and how it behaves
The spider hides by pretending to be the fungus that kills its neighbors, and it took scientists this long to notice because science had no category for an animal that imitates a disease

Overview

  • Researchers formally described Taczanowskia waska in the journal Zootaxa in February 2026, and the discovery drew broad media attention on June 23, 2026.
  • The spider's pale color and long projections on its abdomen closely copy the pale, elongated fruiting bodies of Gibellula fungi that grow from fungus-killed spider corpses.
  • Authors report this is the first documented case of an animal mimicking an araneopathogenic (spider-killing) fungus and say the pattern may represent a new category of pathogen mimicry.
  • The discovery began when an iNaturalist photo was mistaken for a mushroom, community users flagged it as a spider, and taxonomists used museum collections to confirm the new species.
  • Key open questions remain: researchers have morphological evidence for mimicry but need targeted field observations to confirm the spider's motionless leaf‑underside behavior and to search collections for similar cases.