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Scorpions are predatory arachnids of the order Scorpiones. They have eight legs and are easily recognized by a pair of grasping pincers and a narrow, segmented tail, often carried in a characteristic forward curve over the back and always ending with a stinger. The evolutionary history of scorpions goes back 435 million years.
Amblypygi is an order of arachnids also known as whip-spiders or tailless whip-scorpions, not to be confused with whip-scorpions or vinegaroons that belong to the related order Thelyphonida. The name "amblypygid" means "blunt tail", a reference to a lack of the flagellum that is otherwise seen in whip-scorpions.
Scorpions, pseudoscorpions and some harvestmen have evolved muscles that extend two leg joints (the femur-patella and patella-tibia joints) at once. [18] [19] The equivalent joints of the pedipalps of scorpions though, are extended by elastic recoil. [20] "Arachnida" from Ernst Haeckel's Kunstformen der Natur, 1904
In southern Africa, thick-clawed scorpions belonging to the families Scorpionidae, Bothriuridae, and Ischnuridae, are generally assumed to be harmless. However, Opistophthalmus glabrifrons is an exception to the rule. Opistophthalmus species are burrowing scorpions, and probably never leave their burrows except when coming out to mate. This ...
But they do not swing in phase with the walking legs, and are mostly used as legs in rough terrain. [7] Both the nine-segmented pedipalps and the four pairs of legs end in three claws each. The first pair of legs are 11-segmented, the second and third pairs seven-segmented and the fourth pair eight-segmented. [8] [9]
Pulmonoscorpius is an extinct genus of scorpion from the Mississippian (Early Carboniferous) of Scotland.It contains a single named species, Pulmonoscorpius kirktonensis.It was one of the largest scorpions to have ever lived, with the largest known individual having an estimated length exceeding 70 cm (28 inches).
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They have one pair of median eyes at the front of the cephalothorax and up till five pairs of lateral eyes on each side of the head, a pattern also found in scorpions. [18] [19] Whip scorpions have no venom glands, but they have glands near the rear of their abdomen that can spray a combination of acetic acid and caprylic acid when they are ...