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Insects (AO 1945: insects) are invertebrates with a chitinous exoskeleton, a body divided into three tagmata (head, thorax and abdomen), three pairs of jointed legs, compound eyes and two antennae. Its name comes from the Latin insectum. The taxonomic status may vary among different bibliographies, but more often insects belonging to the superclass Hexapoda and the class Insecta of the phylum Arthropoda are considered. As presented here, the Insecta class is taxonomically synonymous with Ectognatha. The science dedicated to studying insects is known as Entomology. Insects are the most diverse group of animals on Earth. As the largest and most widely distributed group of arthropod animals on the planet, insects represent more than 70% of all species of living beings described. Although there is no consensus among entomologists, it is estimated that there are 5 to 30 million living species of insects. of which about 1 million of these species have already been catalogued. Insects can be found in almost every ecosystem on the planet, but only a small number of species have adapted to life in the oceans. There are about 30 formal orders of insects, depending on the classification system adopted. Focusing on the most common and diverse orders, there are currently records of approximately 6 thousand species of Odonata (dragonflies), 24 thousand of Orthoptera (locusts, tettigoniidaes and crickets), 158 thousand Lepidoptera (butterflies and moths), 156 thousand Diptera (flies and mosquitoes), 104 thousand Hemiptera (bed bugs, cicadas and aphids), 387 thousand Coleoptera (beetles) and 117 thousand Hymenoptera (bees, wasps and ants) ).