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In this sense, Insecta sensu stricto is equivalent to Ectognatha.For the purposes of this article, the middle definition is used; insects consist of two wingless taxa, Archaeognatha (jumping bristletails) and Zygentoma (silverfish), plus the winged or secondarily wingless Pterygota.The higher level relationship of the Hexapoda is unclear.Fossilized insects of enormous size have been found from the Paleozoic Era, including giant dragonflies with wingspans of 55 to 70 cm (22–28 in).Insects can communicate with each other in a variety of ways.Male moths can sense the pheromones of female moths over great distances.Clockwise from top left: dance fly (Empis livida), long-nosed weevil (Rhinotia hemistictus), mole cricket (Gryllotalpa brachyptera), German wasp (Vespula germanica), emperor gum moth (Opodiphthera eucalypti), assassin bug (Harpactorinae)], "cut into sections") are by far the largest group of hexapod invertebrates within the arthropod phylum.Definitions and circumscriptions vary; in one approach insects comprise a class within the Phylum Arthropoda.

Although traditionally grouped with millipedes and centipedes—possibly on the basis of convergent adaptations to terrestrialisation—evidence has emerged favoring closer evolutionary ties with crustaceans.

The most diverse insect groups appear to have coevolved with flowering plants.

Adult insects typically move about by walking, flying or sometimes swimming .

Other species communicate with sounds: crickets stridulate, or rub their wings together, to attract a mate and repel other males.

Lampyridae in the beetle order communicate with light.

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In the Pancrustacea theory, insects, together with Entognatha, Remipedia, and Cephalocarida, make up a natural clade labeled Miracrustacea.