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Insect Structure and Development

Insect Structure and Development. Insects and Diseases. External Anatomy. Insects & relatives have a lightweight, but strong exoskeleton – chitin, like fingernails Allows burrowing, tunneling Protection from predation Reduces water loss Greater muscle force

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Insect Structure and Development

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  1. Insect Structure and Development Insects and Diseases

  2. External Anatomy • Insects & relatives have a lightweight, but strong exoskeleton – chitin, like fingernails • Allows burrowing, tunneling • Protection from predation • Reduces water loss • Greater muscle force • Cannot grow – must be shed: MOLTED

  3. Molting: shedding the exoskeleton • During molting process, insect is vulnerable • Often white – highly visible • Soft, easily crushed • Often hide, or molt at night • Usually stop feeding • After molt, exoskeleton is flexible • Inhales to increase size, allow growth

  4. External Sensory Organs • Insects can sense: • Light • Pressure • Sound • Temp • Wind • Odors

  5. Body is divided into 3 regions • Head • Food and sensory intake • One pair of antennae • One pair of compound eyes • 1 to 3 simple eyes • Information processing • Brain • Mouthparts – Key to ID of Damage; Control • Chewing • Sucking • Piercing

  6. Thorax (divided into 3 segments) • Structural support for 6 legs (one pair of legs on each thoracic segment) • Running • Grasping • Digging • Swimming • Structural support for wings • 1 or 2 pairs • Wings may be absent • Abdomen (divided into 11 segments) • Reproduction • Digestion • Circulation • Respiration

  7. Internal Anatomy • Internal systems are simple, yet functional • Circulatory • Simple heart and aorta • Blood flows freely within body cavity • Not oxygen carrying, green blood • Respiratory • Air enters through spiracles • Branching tubes distribute oxygen • Horticultural oils

  8. Digestive • Long, tubelike gut • divided into sections each with a different function • BT bacteria damages the gut

  9. Nervous • Transports and process info from sensory organs • Brain in head; other nerve centers • Phermone compounds confuse • Nerve toxins

  10. Reproductive • Most reproduction is sexual • Males may be rare or seasonal • Males may be absent (aphids) • Some wasp species • males from unfert. eggs • females from fert. eggs • Ovipary(eggs), vivipary (live birth) both common

  11. Virtual Insects

  12. The End

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