Researchers at the University of Western Australia have identified a new spider species in the rainforests of Far North Queensland that constructs a spring-loaded silk snare capable of launching prey into the air — a mechanism precise enough to target a single ant species and violent enough to deliver acceleration comparable to a severe car crash.

The spider has been named after the ballista, the Roman-era torsion artillery that hurled bolts and stones at range. The name is apt: the trap functions not as a passive sticky web but as a loaded mechanism, held under tension until the ant's own defensive behavior triggers its release. ABC News reported the discovery on 23 June 2026, drawing on research published in Current Biology in June 2024.

The mechanism inverts the usual predator-prey dynamic in a notable way. Most orb-weavers and sheet-web spiders build generalist traps and process whatever blunders in. The ballista spider, by contrast, has evolved a snare calibrated to one target — the green ant (Oecophylla smaragdina), a highly aggressive species that would readily overwhelm a small spider in an open confrontation. The trap sidesteps that confrontation entirely. When a green ant contacts a trigger element of the web, the stored elastic energy in the silk releases, flinging the ant into the air and, presumably, into a position of vulnerability the spider can then exploit.

BBC News confirmed the catapult-like character of the silk structure and the trap's specificity to a single ant species. Spider researcher and photographer Greg Anderson is among those involved in the research, per BBC reporting. The acceleration figures cited by Yahoo News — forces on par with a severe vehicle collision — place the trap's performance well into the range of known biological spring-loading systems, alongside mantis shrimp strikes and trap-jaw ant bites, though the silk medium rather than a rigid appendage is what makes this case unusual.

Silk as a spring is not a new concept in arachnology — flagelliform silk in orb-webs stores and releases kinetic energy during prey impact — but deploying that elasticity as an active launching mechanism, rather than a passive damper, is a different engineering proposition. New Scientist described the structure as reminiscent of a snare trap, a configuration distinct from both orb webs and funnel webs. The architecture suggests the spider must invest significant time and silk in building and maintaining the loaded trap, implying that the caloric payoff from green ants — which are large, protein-rich, and abundant in Queensland rainforest canopies — justifies that energetic outlay.

The discovery matters beyond its novelty. Far North Queensland's wet tropics are a recognised biodiversity hotspot, and the ballista spider is a reminder that the canopy and leaf-litter fauna of that corridor remain incompletely catalogued despite decades of systematic collection. Specialist predator-prey co-evolutionary relationships of this specificity are also of broad interest to biomechanics researchers: understanding how silk proteins are tuned to store and release energy at the required rate has downstream relevance for materials science, particularly in the design of bio-inspired fibers and micro-actuators.

The Current Biology publication anchors the formal taxonomy and mechanism description. Field documentation, including video and photographic material from Greg Anderson and others, has since circulated widely, giving the public a rare look at a predation event that unfolds faster than the naked eye can follow.

Queensland's rainforests have yielded a sequence of arachnid surprises over the past two decades — from the peacock spiders of the Maratus genus to various new trapdoor lineages — and the pattern holds: slow, patient fieldwork in the right habitat keeps turning up organisms with solving strategies that challenge assumptions about what arthropod morphology and silk biochemistry can accomplish.