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The lethal dose is expressed as mg/kg of venom required to kill 50% of the mice (LD50) following subcutaneous injection. The lower the LDS0, the more potent the venom. All of the scorpions listed are members of the family Buthidae (compiled from multiple sources).

The lethal dose is expressed as mg/kg of venom required to kill 50% of the mice (LD50) following subcutaneous injection. The lower the LDS0, the more potent the venom. All of the scorpions listed are members of the family Buthidae (compiled from multiple sources).

and Oklahoma but is also found in adjoining parts ofNew Mexico, Colorado, Kansas, Illinois, Missouri, Arkansas, and Louisiana. C. exilimuda (formerly and occasionally still known as C. sculptumtus) is found in most of Arizona, as well as adjoining parts ofNew Mexico, Utah, Nevada, and California. All species of Centruroides can deliver extremely painful stings that may be accompanied by systemic symptoms. However, only C. exilkcmda is

FIGURE 20.1 Centruroides vittatu; (Buthidae), the most common scorpion in the United States. (Photo by S. A. Stockwell.)

considered dangerous, and then only to very small children. The only other buthid occurring in the United States is the cosmotropical species Isometrus ma.cula.tus, an Asian species that has been introduced to tropical port cities around the world. This species is very common on the island of Oahu in Hawaii.

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