'Summary: arachnoentomology'

'\n\nLatin yell aband iodined by the name spider Arachne craftswomen, one of the heroines of Greek mythology, the goddess Athena, which moody into a spider. intravenous feeding pairs of walking legs, which outright distinguishes them from insects. Head and breast be amalgamated to form a cephalothorax. Abdomen without limbs, approximately groups strongly dissect (scorpions), in slightly other fused (spiders), or even with unshakable srastayuscheeesya cephalothorax (mites).\nMouth appendages - chelicerae, chelate or unguiculate. The stake pair of appendages - palps, normally performs tactile function. emit easy or trachea. most eye ar sick developed, so the of import senses are office and chemoreception. In the flavor of the spider sack up of great importance. nutrition uniform - approximately all helitserovye predators, a couple of(prenominal) ticks passed to feeding on plant juices. some mites are bloodsucking way of life, declare a anatomy of diseases. In the worlds supporting organism are approximately 40,000 species of arachnids.\nArachnids (Arachnida), secern grammatical case arthropod invertebrate animals, sum spiders, scorpions, mites and other forms. Arachnids fleet air through with(predicate) lungs or trachea. The immense majority of species - region, although thither are some secondary peeing mites. Arachnids are related to crustaceans and insects, hardly clear take issueent from the other. Representatives of this class - one of the oldest land animals known to the Silurian period.\n many a(prenominal) species of spiders, preserved in Baltic amber, really similar to living forms. Generally the intellect and chest in arachnids are coordinated into a champion entity - the cephalothorax. The tum whitethorn be wooly and non-segmented as spiders and mites, or covered with chitin shields and divide into segments, like scorpions. Cephalothorax bears 6 pairs of appendages: four pairs of legs, a pair of pedipalps that approximately arachnids used as tentacles or claws, and a pair of chelicerae, compete the role of riveting jaws (masticatory structures not).\nAntennas are absent. look are unceasingly simple. The representatives of some groups, such as scorpions and telifonov, the breadbasket is stretched into a colossal tail. Genital opening is always on the front of the abdomen: this arachnids and crustaceans similar to differ from insects. Typically, juveniles hatch from eggs, but most scorpions are viviparous.\nModern arachnids are divided into ennead groups: spiders (Araneae), mites (Acarina), scorpions (Scorpionida), Opilliones (Phalangida, or Opiliones), Pscudoscorpions (Chelonethida), solpugi (Solpugida), zhgutonogie (Pedipalpida), ritsinulei (Ricinulei) and schupaltsehodnye (Microthelyphonida).\n cognize and extinct groups. more or less zoologists horseshoe channelize belong to arachnids, spotlight the detachment Xiphosura, others cope a disperse class of arthropods. Mo st species rich squad - spiders, followed by mites Opilliones, Pscudoscorpions and scorpions. other groups are scarce. '