05InsectAnatS08 - flowering plants(Hymenoptera Lepidoptera...

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1 Announcements Quiz today. Field trip dates Pepperwood- Sun Feb 24 Galbreath- Sat Apr 26 or Sun Apr 27 Darwin Day and Biosystematists Public tours of Essig Museum in afternoon Darwin’s B Day party at 5:00 Biosystematists at 7:30 must submit list today! Evolution of Metamorphosis Occurred about 300 MYBP in Carboniforous Coincided with evolution of seed plants Two main types Hemimetabolous Gradual change to adult form No pupal stage Includes true bugs Holometabolous True larval and pupal stage present Includes beetles, flies Insects and Plants Very old associations Early plant fossils show insect damage Insects diversified as plants did
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2 Diversification in Mesozoic Diversification of insects that eat plant feeding insects Appearance of Lepidoptera in Jurassic Appearance of flowering plants in early Cretaceous (130 MYBP) Diversification of insects associated with flowering plants (Hymenoptera,
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Unformatted text preview: flowering plants (Hymenoptera, Lepidoptera) Insect Body Plan (3 regions) 3 ‘ Generalized ’ insect Insects vary a lot with respect to endoskeleton and appendages Orientation • Dorsal • Lateral • Ventral • Appendages – Proximal – Distal Functions of cuticle • Forms exoskeleton • Prevents water loss • Provides support for muscle attachments • Lines tracheae and parts of digestive system • Varies in toughness – Thick/hard, thin/flexible – Depends on life stage 4 Components of cuticle • Waxes and lipids • Proteins • Chitin – in fungal cell walls and arthropod exoskeletons – unbranched polysaccharide polymer of high MW Structure of cuticle • Epicuticle • Procuticle – exocuticle and endocuticle – made of chitin and protein – Thickest layer • Epidermis – live cells – secretes cuticle...
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