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any of approximately 105 species of the arthropod class Arachnida that are similar in appearance to true scorpions except that the larger species have a whiplike telson, or tail, that serves as an organ of touch and has no stinger. The second pair of appendages, the pedipalps, are spiny pincers, and the third pair are long feelers. Whip scorpions secrete an irritating mist, which has a vinegarlike odour in Mastigoproctus giganteus, the vinegarroon (variably spelled) of the southern United States and Mexico. With its 65-mm (2 12-inch) body it is the largest species in this group