killer spider biteTop 10 List:

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This list is based on their "lethal potential, which is their venom yield divided by their venom potency.

Species From
1. Banana Spider Central and South America
2. Sydney Funnel Web Spider Australia
3. Wolf Spider Central and South America
4. Black Widow Widespread
5. Violin Spider / Recluse Spider Widespread
6. Slender Sac Spider Widespread
7. Tarantula (Eurypelma rubropilosum) Neotropics
8. Tarantula (Acanthoscurria atrox) Neotropics
9. Tarantula (Lasiodora klugi) Neotropics
10. Tarantula (Pamphobeteus species) Neotropics

See also the world's deadliest snakes