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Insects that undergo 3-stage metamorphosis lack a pupal stage and adults develop through a series of nymphal stages.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).The most diverse insect groups appear to have coevolved with flowering plants.Insects are the only invertebrates to have evolved flight.Adult insects typically move about by walking, flying or sometimes swimming .

Get the best internet news recommended by top internet influencers direct to your inbox in a once-weekly digest, and unsubscribe any time.Get members-only access to internet data and tools, analyze your website and explore how the world uses the internet.Insects may be found in nearly all environments, although only a small number of species reside in the oceans, a habitat dominated by another arthropod group, crustaceans.The life cycles of insects vary but most hatch from eggs.

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 a class of invertebrates within the arthropod phylum that have a chitinous exoskeleton, a three-part body (head, thorax and abdomen), three pairs of jointed legs, compound eyes and one pair of antennae.

They are the most diverse group of animals on the planet, including more than a million described species and representing more than half of all known living organisms.

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