About 75% of all world insect species have this type of development. The adults are flying terrestrial insects, so they have some major structural differences, but the changes are accomplished without a pupal stage. None of these kinds of insects are covered in the Kentucky master gardener material, but dragonflies and damselflies can sometimes be beneficial predators in gardens that are located close to water.Ĭomplete Metamorphosis. It lives in the water, for which it has the necessary adaptations, including gills and a streamlined body. The immature stage is a type of nymph called a naiad. This development type is unique, occurring in three orders of aquatic insects: dragonflies and damselflies (Odonata), mayflies (Ephemeroptera), and stoneflies (Plecoptera). There is typically an egg stage, multiple nymph stages, and a single adult stage. Read more about these orders in Insect Orders I: Gradual Metamorphosis. The orders of insects covered in the Kentucky master gardener materials include Orthoptera, Mantodea, Blattaria, Dermaptera, Thysanoptera, Hemiptera, and Homoptera. Except for wing characteristics, the basic features of the order can be used to identify nymphs and adults to the order level. Nymphs have the same type of mouthparts as the adult, feed on the same food, and have the same general behavior. External wing buds can be seen on late-stage nymphs. In addition to being smaller, the nymph does not have wings and is not sexually mature. This is a type of development in which the immature stage (nymph) is a smaller version of the adult. None of the orders covered in the Kentucky master gardener material have this kind of metamorphosis. The only change that takes place in these insects is an increase in size as the insect develops. No Metamorphosis occurs in the most primitive insects-springtails and silverfish, for example. Most insects have either gradual or complete metamorphosis.
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