1. Six eyed sand spider (Sicarius hahni)
LD50 value: 0.004
What makes this weird-named six eyed sand spider the most venomous spider in the world is the fact that very tiny dose of its venom painfully kills its victim. It is indigenous to South African deserts where it camouflages very nicely. It is not fond of making webs, and instead hunts its pray, sometimes by burying in the sand where it can spend a lot of time, being able to live without food for months. Of two known cases of bites in humans, one ended in death and the other in amputation!
