Entomology Essentials: Rahul’s Quick Guide for Master’s Prep

Orientation of heads of insects

a. Hypognathous head

  • Head directed downward.
  • Eg: Grasshopper

 

b. Prognathous head:

  • Mouth projected forward
  • Eg: Weevils

 

c. Opisthognathous head:

  • Mouth slope backwards between legs under thorax and abdomen.
  • Eg: Bugs
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