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Scorpions detachment of arthropods from the class of arachnids. Exclusively terrestrial forms which are found only in tropical countries. Total known about 1750 kinds of scorpions but the poison is only about 50 of them poses a risk to humans. Among them are the greatest arachnids such as emperor scorpion reaching a length of 20 cm and relatively small a length of 13 mm. The word scorpion is derived from ancient Greek. The Old Russian SCORPIO meant snake. The study has been scorpions Arachnology the science of arachnids.
Scorpions detachment of terrestrial arthropods. The ancestors of scorpions Paleozoic merostomes. On the example well traced the evolutionary transition from water to land habitat life. Living in water and has gills eurypterids of Silurian had much in common. Ground shape close to modern known from coal period .
Scorpion's body is composed of a small cephalothorax or prosoma and long belly or opisthosoma in which there are two divisions a wider anterior closely adjacent to the cephalothorax and constituting with it a whole preabdomen or mesosoma metasoma sharply delimited from preabdomena and having similarity tail. For the last segment postabdomen adjoins another pear-shaped segment that ends up curved needle on top of which are placed two holes poisonous glands.
The whole body is covered by a scorpion chitinous shell representing the product selection of the underlying hypodermic layer. Distinguish golovogrudny panel to cover up the cephalothorax from the dorsal side then in accordance with the number of segments preabdomena 7 dorsal and ventral boards interconnected by a soft membrane and finally in 5 postabdomen closed dense chitinous rings connected by a thin skin.
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