Topic Six

• Ametabolous

  1. no metamorphosis
  2. egg hatches into mini adult
• Hemimetabolous

  1. incomplete metamorphisis
  2. each instar there is an increase in size
  3. gradual change from molt to molt
• Holometabolous

  1. complete metamorphosis
  2. larval is very different than the fianl form
  3. pulpa emerges into final form
• Cues for molting;

  1. distension of abondimal wall
  2. body weight
  3. temperature
  4. photoperiod
• Important hormones in ecdysis

  1. prothoracicotropic hormone (PTTH)
  2. ecdysone- steroid
  3. 20-OH-ecdysone- beta ecdysone
  4. juvenile hormone (JH)
  5. Bursicon