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The metasoma is narrow, slender and consists of five cylindrical segments and a telson or sting. Each segment of metasoma has complete tergal and sternal arcs of octagonal shape formed by the complete fusion of terga, sterna and pleurons. These segments are flexibly joined one behind the other. The last segment bears a telson which consists of two parts—the proximal rounded ampulla or vesicle and the distal pointed spine or aculeus. Inside the ampulla are two poison glands enclosed in smooth muscles, whose ducts open by a pair of minute apertures at the tip of the spine