Sydney funnel web
The Sydney funnel-web spider is a species of venomous mygalomorph spider native to eastern Australia, usually found within a 100 km radius of Sydney. It is a member of a group of spiders known as Australian funnel-web spiders.
The Sydney funnel-web spider (Atrax robustus) is a veritable bruiser amongst the spider world. Whilst most spiders seek to avoid confrontation with humans the funnel-web will charge in delivering a volley of bites whilst clinging to its victim. So although its venom is no more potent than many of the spiders on this list, the funnel-web makes sure the unfortunate recipient gets the full dose.
In addition to its temperament the Sydney funnel-web is well equipped for the job. It has the most impressive fangs of any spider; these needle sharp weapons are longer than those of some snakes. Armed with these killer fangs and powerfully built, the funnel web is reputed to be able to bite through shoe leather and even finger nails.
Unlike virtually every other group of spiders it is the male Sydney funnel-web that is equipped with the most potent venom – up to six times stronger than that of the female. The venom itself is a neurotoxin which appears to be particularly effective against primates. Within minutes of being bitten the victim may suffer extreme symptoms such as muscle spasms, palpitations, vomiting, confusion and swelling of the brain. In some cases death has followed in as little as 15 minutes after the bite occurred.
The good news is an effective anti-venom was introduced in 1981 and there hasn’t been a death since.