Researchers from Macquarie University have discovered a new spider species in Far North Queensland that uses a spring-loaded silk snare to capture prey [1, 2].
The discovery reveals a highly specialized evolutionary adaptation. By utilizing a mechanical catapult system, the spider can subdue aggressive green tree ants that would otherwise be too dangerous or difficult to capture through traditional webbing [3, 5].
Led by Prof. Ajay Narendra, the team identified the creature in the rainforests of Far North Queensland [1, 4]. The spider, dubbed the ballista spider, does not rely solely on a passive web. Instead, it constructs a sophisticated snare designed to launch its target into the main web [3, 5].
This mechanism allows the spider to neutralize the threat posed by the ants' aggression. The force of the launch is significant; the prey is accelerated up to 140 times the force of gravity by the silk snare [6]. This rapid acceleration ensures the ant is incapacitated or trapped before it can retaliate against the spider [6].
The findings were reported in June 2026 [1, 2]. The researchers said that the spider evolved this specific behavior to target a single species of ant, demonstrating a narrow but highly effective predatory niche [4].
This biological engineering allows the ballista spider to thrive in an environment where other predators might struggle to handle the volatile nature of green tree ants. The precision of the silk snare reflects a complex interaction between the spider's architecture, and the behavioral patterns of its prey [3, 5].
“The prey is accelerated up to 140 times the force of gravity by the spider's silk snare.”
The discovery of the ballista spider highlights the extreme lengths to which predators evolve to overcome the defenses of highly aggressive prey. By shifting from a passive trapping method to an active, mechanical launch system, the spider has effectively bypassed the defensive capabilities of green tree ants, showcasing a rare example of specialized biological weaponry in arachnids.
