10. Redback spider (Latrodectus hasselti)
LD50 value: 0.9
Although being one of the most famous indigenous Australian venomous spiders, Redback spider is in the last place on our list because of relatively high (comparing to others here) LD50 values of their venom. These spiders are easily recognized by a red strip on their back. They are infamous because they are responsible for 2,000-10,000 spider bites in Australia annually.
