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Lifecycles And Internal Anatomy Hummel


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Dr. Natalie Hummel, LSU AgCenter Department of Entomology

* Lifecycles
* Insect internal anatomy.

Published in: Technology, Health & Medicine
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Lifecycles And Internal Anatomy Hummel

  1. 1.   Lifecycles Insect Internal Anatomy Dr. Natalie Hummel, LSU AgCenter Department of Entomology E-mail: [email_address] 9:45 to 10:15
  2. 2. Hemi-metabolous Hemi = partial -metabolous = change Incomplete development Larva looks similar to adult Egg Nymph Adult
  3. 4. Chinch Bug J. Saichuk Aphids – a variation on this… Amorochrous dubius Rice Stink Bug J. Saichuk
  4. 8. Holo-metabolous Holo = complete -metabolous = change Complete development Larva looks different from adult Rice Water Weevil Egg Larva Adult Pupa
  5. 10. Colaspis Rice water weevil J. Saichuk J. Saichuk SARM Skippers J. Saichuk J. Saichuk J. Saichuk Fall Armyworm Rice Leafminer J. Saichuk J. Saichuk Rice Levee Bill Bug Rice Seed Midge J. Saichuk
  6. 11. J. Saichuk J. Saichuk
  7. 12. R. Riggio
  8. 13. R. Riggio Feeding site Head
  9. 14. J. Saichuk J. Saichuk Puparia
  10. 17. A. Meszaros
  11. 18. J. Saichuk
  12. 19. Internal Anatomy
  13. 20. The Nervous System Allows the insect to interact with the environment Figure source Peng, UC Dacvis
  14. 21. The Brain <ul><li>Processes information </li></ul><ul><li>Protocerebrum </li></ul><ul><ul><li>Vision </li></ul></ul><ul><li>Deutocerebrum </li></ul><ul><ul><li>Olfaction </li></ul></ul><ul><li>Tritocerebrum </li></ul><ul><ul><li>Feeding </li></ul></ul>Figure source Chapman, 1998
  15. 22. How do Insects Sense the Environment? Tarsal receptors are activated Action potential occurs Message is sent to brain Feeding commences Figure source Peng, UC Dacvis
  16. 23. <ul><li>Circulates blood & hormones </li></ul><ul><li>Hemolymph </li></ul><ul><ul><li>Plasma ~ blood </li></ul></ul><ul><ul><li>Hemocytes ~ blood cells </li></ul></ul><ul><ul><li>Trehalose ~ blood sugar </li></ul></ul><ul><li>Pump (heart & dorsal aorta) </li></ul><ul><li>Diaphrams (Dorsal & Ventral ) </li></ul><ul><li>Neurohormones control </li></ul>The Insect Circulatory System Figure from Chapman, 1998
  17. 24. Figure from Chapman, 1998
  18. 25. Endocrine System - Hormones <ul><li>Growth (molting) </li></ul><ul><li>Reproduction </li></ul><ul><li>Feeding </li></ul><ul><li>Mating </li></ul>
  19. 26. Reproductive tract
  20. 27. Digestive tract
  21. 28. The Big Picture – Endocrine system Figure source Peng, UC Dacvis
  22. 29. The Insect Tracheal System <ul><li>Oxygen & waste products to & from each cell </li></ul><ul><li>Tracheal system </li></ul><ul><ul><li>Spiracles </li></ul></ul><ul><ul><li>Trachea </li></ul></ul><ul><ul><li>Taenidia </li></ul></ul><ul><ul><li>Tracheoles </li></ul></ul><ul><ul><li>Tracheolar cells </li></ul></ul>Figure Snodgrass, 1935
  23. 30. Figure Snodgrass, 1935
  24. 31.
  25. 32. References <ul><li>Chapman, R.F. 1998. The Insects: Structure and Function. Cambridge University Press. NY, NY USA. </li></ul><ul><li>Snodgrass, 1935. Principles of Insect Morphology </li></ul><ul><li>Online resources, as cited in slides. </li></ul><ul><li>Peng, C.Y.S. Insect Physiology Lab Manual. </li></ul>