Scorpions
The order Scorpionida contains several families, genera, and species of scorpions. All have paired venom glands in a bulbous segment, called the telson, that is situated just anterior to a stinger on the end of the six terminal segments of the abdomen (often called a tail). The only systemically poisonous species in the United States is Centruroides exilicauda (formerly C sculpturatus), also known as the bark scorpion. The most serious envenomations usually are reported in children younger than 10 years of age. This scorpion is found primarily in the arid southwestern United States but has been found as a stowaway in cargo as far north as Michigan. Other dangerous scorpions are found in Mexico (Centruroides species), Brazil (Tityus species), India (Buthus species), the Middle East, and North Africa and the eastern Mediterranean (Leiurus and Androctonus species).
Mechanism of toxicity. The scorpion grasps its prey with its anterior pincers, arches its pseudoabdomen, and stabs with the stinger. Stings also result from stepping on the stinger. The venom of C exilicauda
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