1. There are three main types of insect heads: prognathous, hypognathous, and opisthognathous. Prognathous insects have a horizontal head axis with forward-facing mouthparts. Hypognathous insects have a vertical head axis perpendicular to the body with downward-facing mouthparts. Opisthognathous insects have a deflexed head with backward-facing mouthparts held between the forelegs.

1. .
TYPE of INSECT
Head

2. Type of Insect Heads
1. Prognathous
2. Hypognathous
3. Opisthognathous

3. • (Pro- front, gnathous – jaw)
• also called coleopteroid type
• axis of the head is horizontal
• in line with the axis of the body
• Mouth parts – foreword
• Eg: ground beetles.

4. 2. HYPOGNATHOUS
• (Hypo – below, gnathous – jaw)
• also called orthopteroid type
• axis of the head is vertical
• Right angles to axis of the body
• Mouth parts - ventrally placed
& downwards

5. 3. OPISTHOGNATHOUS
• (Opistho – behind ;
gnathous – jaw)
• also called hemipteroid
type
• Head is deflexed
• Mouth parts - directed
backwards & held in b/w
the fore legs
Eg: Stink bug