Which species is the most widespread Aedes in the United States?

• A. Aedes albopictus
• B. Aedes vexans
• C. Ochlerotatus sollicitans
• D. Ochlerotatus atlanticus

Answer: (B)

The question hinges on geographic distribution and habitat flexibility of mosquito species. Aedes vexans, the floodwater mosquito, is found across virtually the entire United States because it can breed in a wide range of temporary water habitats created by rainfall, irrigation, or runoff. This ecological versatility lets it emerge in many environments—from rural to urban—giving it a truly nationwide presence.

In contrast, the coastal or habitat-specialized species are limited to specific environments like salt marshes or coastal zones, and even the widespread Aedes albopictus tends to be concentrated in particular regions rather than everywhere. So the species that is most widespread across the country is Aedes vexans.