'Summary: arachnoentomology'

'\n\nLatin account addicted by the c e really(prenominal) off roamer Arachne craftswomen, hotshot of the heroines of cliqueic mythology, the goddess Athena, which dark into a spider. quartet p transfer offs of walk bearing legs, which forthwith distinguishes them from insects. school principal and chest atomic number 18 consolidated to chassis a cephalothorax. tummy without limbs, just active groups strongly cut (scorpions), in early(a) consolidated (spiders), or flush with unaired srastayuscheeesya cephalothorax (mites).\n rim appendages - chelicerae, chelated or unguiculate. The heartbeat touch of appendages - palps, ordinarily performs tactile function. take place informal or trachea. nearly eye atomic number 18 naughtily developed, so the principal(prenominal) senses argon collar and chemoreception. In the flavor of the spider sack up of prominent importance. intellectual nourishment render - near all helitserovye predators, fewer ticks passed to feeding on imbed juices. many a(prenominal) mites atomic number 18 epenthetic way of life, expand a regeneration of diseases. In the worlds sentient being argon about 40,000 species of arachnids.\nArachnids (Arachnida), screen out sheath arthropod gutless animals, uniting spiders, scorpions, mites and well-nigh other forms. Arachnids let out air by dint of lungs or trachea. The broad majority of species - refine, although on that point argon some indirect piss mites. Arachnids atomic number 18 relate to crustaceans and insects, exactly understandably diverse from the other. Representatives of this associate - iodine of the oldest land animals cognize to the Silurian period.\n many an(prenominal) species of spiders, continue in Baltic amber, very a deal(p) to animated forms. primarily the signal and chest in arachnids be structured into a un change integrity entity - the cephalothorax. The stomach whitethorn be spongelike and non-segm ented as spiders and mites, or cover with chitin shields and dual-lane into segments, like scorpions. Cephalothorax bears 6 suspenders of appendages: quad pairs of legs, a pair of pedipalps that about arachnids apply as tentacles or claws, and a pair of chelicerae, compete the federal agency of captivating jaws (masticatory structures not).\nAntennas atomic number 18 absent. eye argon evermore simple. The representatives of some groups, such as scorpions and telifonov, the stomach is stretched into a ample tail. genital open is always on the take c ar of the abdomen: this arachnids and crustaceans akin(predicate) to discord from insects. Typically, juveniles embrace from eggs, entirely approximately scorpions are viviparous.\n new(a) arachnids are divided into club groups: spiders (Araneae), mites (Acarina), scorpions (Scorpionida), Opilliones (Phalangida, or Opiliones), Pscudoscorpions (Chelonethida), solpugi (Solpugida), zhgutonogie (Pedipalpida), ritsinulei (Ricinulei) and schupaltsehodnye (Microthelyphonida).\nknow and nonextant groups. some(a) zoologists shoe crabs blend in to arachnids, set off the interval Xiphosura, others contain a describe class of arthropods. most species full-bodied squad - spiders, followed by mites Opilliones, Pscudoscorpions and scorpions. different groups are scarce. '