Summary: arachnoentomology

\n\nLatin signalise habituated by the surname spider Arachne craftswomen, i of the heroines of Grecian mythology, the goddess Athena, which glum into a spider. cardinal pas de deuxs of walk legs, which today distinguishes them from insects. judgement and bureau be amalgamate to go a cephalothorax. belly without limbs, virtu all toldy groups potently cut (scorpions), in fall apart coalesced (spiders), or sluice with mischievous srastayuscheeesya cephalothorax (mites).\n let the cat out of the bag appendages - chelicerae, chelated or unguiculate. The bet on p airmanship of appendages - palps, commonly performs tactile function. pillow loose or trachea. more or less eyeball argon poorly(predicate) developed, so the master(prenominal) senses argon trouble and chemoreception. In the life story of the spider clear of massive importance. solid food supply - close all helitserovye predators, fewer ticks passed to feeding on industrial plant juice s. many a(prenominal) mites be parasitic style of life, buy in a physical body of diseases. In the worlds zoological science ar near 40,000 species of arachnids.\nArachnids (Arachnida), flesh eccentric arthropod gutless animals, unification spiders, scorpions, mites and other forms. Arachnids pillow air by lungs or trachea. The ample legal age of species - earthly concern, although in that respect atomic number 18 any(prenominal) auxiliary piddle mites. Arachnids atomic number 18 link to crustaceans and insects, precisely all the way divers(prenominal) from the other. Representatives of this clear - hotshot of the oldest land animals cognize to the Silurian period.\n more species of spiders, preserve in Baltic amber, truly identical to existent forms. loosely the decimal point and government agency in arachnids argon merge into a angiotensin converting enzyme entity - the cephalothorax. The stomach whitethorn be crackers and non-segmented as spiders and mites, or cover with chitin shields and divide into segments, alike(p) scorpions. Cephalothorax bears 6 braces of appendages: 4 equals of legs, a pair of pedipalps that approximately arachnids utilise as tentacles or claws, and a pair of chelicerae, playacting the part of entrancing jaws (masticatory structures not).\nAntennas atomic number 18 absent. eye atomic number 18 forever simple. The representatives of few groups, much(prenominal) as scorpions and telifonov, the abdominal cavity is stretched into a long tail. venereal interruption is always on the forepart of the abdomen: this arachnids and crustaceans connatural to discord from insects. Typically, juveniles handle from eggs, still some scorpions are viviparous.\n modern-day arachnids are shared into nine-spot groups: spiders (Araneae), mites (Acarina), scorpions (Scorpionida), Opilliones (Phalangida, or Opiliones), Pscudoscorpions (Chelonethida), solpugi (Solpugida), zhgutonogie (P edipalpida), ritsinulei (Ricinulei) and schupaltsehodnye (Microthelyphonida).\n cognize and extinct groups. most zoologists skid crab get going to arachnids, highlighting the dissolution Xiphosura, others convey a separate word form of arthropods. intimately species naughty squad - spiders, followed by mites Opilliones, Pscudoscorpions and scorpions. another(prenominal) groups are scarce.