Scorpions are a distinctive and well recognized group of arachnids. They are most easily distinguished by their lobster like appearance gut especially by their fleshy “tail” that terminates in a bulbous sack and prominent stinger. The larger from pincers (modified mouth parts are used to capture and hold prey while feeding. The stinger is used to subdue prey and for defense.
Scorpion are common throughout Nevada. Approximately 23 species of scorpions are known to occur in Nevada, usually with more than one species living in close proximity to each other. Only one Nevada species is considered serious poisonous, the bark scorpion (Centruroides esilicauda). The Bark scorpion only occurs in extreme southeastern Clark County in the virgin mountains near mesquite and gold butte and is ales well established in isolated area of the Las Vegas valley. All the other species have venom and can sting when provoked or trapped, but reaction to the sting is usually mild. Most desert scorpions are commonly encountered by people working around rocks or debris, which are hiding areas for scorpions during the day. Entrance usually occurs in newly developed areas less than three years old. Migrations into homes often follow heavy summer rains. Centruroides exiliicaudsa however, has been caught inside and outside Las Vegas houses throughout most of the year. Outdoors they have been collected from palm trees, outer walls of buildings and concrete blocks walls. Another peculiar habit of bark scorpions is their tendency to climb and seek cover in cracks and crevices of houses and under tree bark, hence it name bark scorpion Centruroides exlilicauds is often found a fair distances above the ground. Most other scorpion species in Nevada are ground dwellers.
Scorpions can produce a painful sting when handled or disturbed. Again, most Nevada species are not highly poisonous, with the exception of the bark scorpion Centruroides exilicauda. If stung by Centruroides ecilidauda, you may exhibit a variety of symptoms. Stings are usually immediately painful. The limb or area around the sting may exhibit numbness, weakness, and even paralysis. Other symptoms are hyperactivity, anxiety, profuse salivation, dizziness, respiratory distress and even convulsions. The sting site does not swell and become discolored as it soes with other species of scorpion. If a person has been stung by a bark scorpion, a physician should be contacted. However, most treatments can be done at home with the use of a mild analgesics and col compresses for discomfort. Children two years old and younger are especially susceptible and often require hospitalization.
Scorpions are nocturnal. At night they defend their territory, feed and mate. Scorpions have poor eyesight. They do not stalk their prey; instead, they lie in wait for ambush. Insects, spiders, millipedes, other scorpions, and small vertebrates are common scorpion prey. Only a small portion of scorpions may be out on any one night.