Jumping Spider
Jumping spiders are brown or black and usually grow to be no more than a couple of inches, with the female jumping spider being larger than the male. Jumping spiders have four pairs of eyes. Called such because they are able to jump up to 40 times their own body length, these spiders are not considered dangerous. However, many people find them intimidating because jumping spiders often attack when they feel threatened.
Wolf Spider
Wolf spiders are mostly nocturnal spiders known for their hairy bodies. The wolf spider can do some damage. While the bite of a wolf spider is not fatal, it is venomous and therefore generally very painful. Wolf spiders' brown coloring blends in with the desert environment of Nevada, though they can grow up to 5 inches in length.
Black Widow
Black widow spiders are a poisonous species residing all over the country, but especially in Nevada and the surrounding region. Considered one of the most dangerous spiders, they thrive in warmer environments and are mostly nocturnal. The bite of a black widow spider can be fatal, especially for those who are young or elderly. However, only the female black widow spider is venomous. Black widow spiders are identifiable by their shiny black bodies and the red hourglass shape on the bottom of their abdomens.
Desert Recluse
The desert recluse spider is a poisonous species that is closely related to the brown recluse spider. While they are only found in small numbers near the southern tip of Nevada, they are very dangerous to humans. Desert recluse spiders grow up to about 2 inches long. Their coloring is a yellow-tan with no markings on it, making it easy for them to blend into the desert environment. Desert recluse spiders have three pairs of eyes. While not fatal, the bite of a desert recluse spider will cause severe damage to the skin and surrounding tissue at the site of the bite. The resulting open sore will take a long time to heal.