Sydney funnel‑web spider (Atrax robustus)

Identification and anatomy

Distinctive features include a robust, dark body, powerful chelicerae (fangs) and a configuration of eyes typical of primitive mygalomorph spiders. Key identifying points are:

• Stout, compact build with a glossy cephalothorax;
• Strong, downward‑pointing fangs capable of delivering venom;
• Silken funnel or tubular burrow often hidden beneath leaf litter, logs or garden debris.

Venom and medical importance

The species produces a potent neurotoxic venom that affects ion channels in nerve cells. Clinical symptoms of a serious bite can include intense local pain, sweating, drooling, breathing difficulty, and changes in heart rate and blood pressure. Historically, Atrax robustus was associated with human fatalities: documented deaths occurred before the development and routine use of a targeted antivenom. Since the widespread availability of antivenom, fatalities directly attributable to bites of this species have not been reported when treatment is given promptly.

Medical guidelines advise rapid transport to healthcare facilities, immobilisation of the bitten limb and avoidance of traditional first‑aid measures such as tourniquets without professional direction. Antivenom is effective and has dramatically reduced the risk from serious envenomation.

Habitat, behaviour and human interaction

Sydney funnel‑webs prefer moist habitats and are often found in sheltered sites close to human habitation, including gardens, rock crevices and under logs. Adult males become more mobile when searching for mates, particularly in autumn, increasing the chance of encounters with people. Despite their fearsome reputation, these spiders are not aggressive toward humans unless provoked or trapped against the skin.

For guidance on identification, avoidance and treatment, consult local health resources or professional entomological advice. More information is available from regional authorities and reputable sources: see local guidance.