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Unit 2 SG - Unit Two Insect Evolution Study Guide Lesson...

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Unformatted text preview: Unit Two - Insect Evolution Study Guide Lesson Objectives By the end of the unit you should be able to: Describe the four successive stages of insect evolution Define ametabolous, hemimetabolous and holometabolous, and the similar terms regarding wing development Describe the two theories of insect wing evolution and why it is difficult to explain how insects evolved their wings. Introduction Metamorphosis terms Differentiate between ametabolous, hemimetabolous, and holometabolous. Type of metamorphosis ametabolous hemimetabolous holometabolous Definition Insects that do this lacking metamorphosis, no change in body form development to adult immature stages lack genitelia body form gradually changes at each molt wing buds grow at each molt body form abruptly changes at pupal molt Evolutionary Stages Apterygota What does "apterygote" mean? without wings Describe this stage and which insects represent this group. insects- archaeognatha, zygentoma Paleopterous What does "paleopterous" mean? wings What is another term used to describe this stage? Pterygota Describe this stage and which insects represent this group. ephemeroptera, odonata lepidopter What are some of the advantages wings and flight provide? disperse greater distances, locate isolated food sources, find mates more easily, avoid predators Wing Flexon What does "neopterous" mean? new wing, abilty to bend at the base Describe this stage and which insects represent this group. insects: crickets, roaches, grasshoppers, thrips, earwigs How was this stage an advantage over the previous stages? insects with wing flexon could now crawl into crevices or under rocks to hide form predators Complete Metamorphosis Describe this stage and which insects represent this group. insects: wasps, bees, flies, beetles, fleas, moths, butterflies Why are insects in this group so successful? holometabolous insects' larval form can be more specialized Wing Evolution/ Adaptation ASSIGNMENT Write a brief essay for your journal (no more than one-page) supporting one hypothesis over the others. Title your journal entry, "Wing Evolution Project." NOTES: ...
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