The Sydney funnel-web spider (Atrax robustus) is a species of Australian funnel-web spider usually found within a 100 km (62 mi) radius of Sydney, New South Wales, Australia. It is a venomous spider with a bite capable of causing serious injury or death in humans if left untreated. - http://myscienceacademy.org/2013/02/15/5-most-dangerous-spiders/
Sydney Funnel-web Spider Male Sydney funnel-web spiders are Australia's most dangerous spider. These aggressive spiders grab onto their victims and bite several times, injecting a very poisonous venom. Some people have died from the bite of these spiders, but since 1980 when a Sydney funnel-web spider antivenom was invented, no-one has died from the bite of a Sydney funnel-web spider.
Sydney Funnel Web Spider - 160 Km radius of Sydney, Australia - With highly toxic venom produced in large amounts and large fangs to inject it, it is without a doubt the deadliest spider in the world. Though just 1.5-3.5cm big, the fangs are larger than a brown snake's and so powerful they can even pierce through nails. When bitten by a male, it can kill.They are very aggressive when threatened.
The Funnel Web is one of Australia's deadliest animals, with a venom that is packed with at least 40 different toxic proteins. A bite from a Funnel Web causes massive electrical over-load in the body's nervous system. Finally, fatalities occur from either heart attack or a pulmonary oedema, where the capillaries around the lungs begin to leak fluid and the patient effectively drowns. Death can come as quickly as two hours after a bite if no medical treatment is sought.