#1 Anopheles Mosquito
For many, mosquitos may appear more annoying than dangerous, but this genus of mosquito caries malaria. Its reported that 600,000 deaths and over 200 million cases of malaria happened in 2012.
Honorable Mentions
Brazilian Wandering Spider- the most venomous spider.
Bedbugs- Known to alter mental wellbeing.
Termites- Can damage property.
Deer Ticks- Cause Lyme disease.
Tarantula hawk- Its bite is second to bullet ants in the pain index.