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Lab. No.7

Lab. No.7. Insects Metamorphosis. 1. Metamorphosis. * Metamorphosis refers to the way that certain organisms develop, grow, and change form. Types of metamorphosis. 1. Ametabolous- no metamorphosis 2. Hemimetabolous- incomplete 3. Holometabolous- complete. Ametabolous.

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Lab. No.7

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  1. Lab. No.7 Insects Metamorphosis 1

  2. Metamorphosis * Metamorphosis refers to the way that certain organisms develop, grow, and change form.

  3. Types of metamorphosis 1. Ametabolous- no metamorphosis 2. Hemimetabolous- incomplete 3. Holometabolous- complete

  4. Ametabolous Insects show no metamorphosis. Here the adult looks like the immature except for the presence of genetalia and gonads. The silverfish is an example

  5. Hemimetabolous- incomplete * In these insects, the nymph more or less resembles the adult and there is no pupal stage. Examples: plant bug, crickets, true bugs, termites, grasshoppers, and cockroaches.

  6. Stages of Hemimetabolous 1. Egg 2. Nymph 3. Adult

  7. Types of Holometabolous 1. Paurometabola- gradual metamorphosis e.g. Cockroach

  8. 2. Emimetabola

  9. Holometabolous- complete * Larvae and adults of these insects are very different and a distinct pupae is formed. Examples: beetles, flies, bees, lacewings, butterflies, ants, and caddis flies.

  10. Stages of Holometabolous 1. Egg 2. Larvae 3. Pupa 4. Adult

  11. Adult Eggs Larvae Pupa Adult

  12. Insects stages 1. Eggs egg case of a  cockroach

  13. Eggs of Grasshopper

  14. Hatching insect egg

  15. 2. Larvae a. Polypod

  16. b. Oligopod b.1 Scarabaiform * C-shaped body * 3 pairs of thoracic legs * e.g., dung beetles

  17. b.2 Campodeiform * Flattened body

  18. c. Apodus c.1 Eucephalous

  19. c.2 Hemicephalous

  20. c.3 Acephalous e.g., Musca domestica

  21. 3. Pupa a. Obtect pupa e.g., butterflies

  22. b. Exarate pupa e.g., beetles

  23. c. Coarctate pupa

  24. d. Active pupa e.g., mosquito

  25. ? ? ?

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