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Spiders detachment of arthropods the second most well-known representatives of the class of arachnids. From the order of it is widespread. Spiders obligate carnivores feeding primarily on insects and other small animals. It is known only one exception jumping spider Bagheera kiplingi eating green parts acacia. The detachment includes about 42 thousand today and about 1.1 thousand fossil species. On the territory of Russia and former USSR countries inhabited by 2888 species.

The body consists of two segments the cephalothorax and substantially undifferentiated abdomen connected to each other with a thin stalk Generally short, much less elongated groove cephalothorax clearly divided into two areas the head and the chest one first carries two pairs of limbs chelicera consisting of a thick usually a short segment armed movable claw near the tip of which has a channel opening that displays the toxic selection glands are largely metatarsus and palps composed of 6 segments. In adult males pedipalps Tarsus converted into copulatory apparatus tsimbium.

Between chelicerae atop protuberance is oral hole for sucking This limited lobe bottom front appendage breast the so-called lip and laterally two maxillary plates.

Behind pedipalp to cephalothorax fastened four pairs of legs each of which consists of seven segments Basin trochanter thigh cup tibia predlapki and foot ( tarsus ) armed with the bottom smooth or serrated claws between which there is sometimes a short unpaired claw.

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