Question

Entognathous mouth parts are found in:

• A. Lepidoptera
• B. Hymenoptera
• C. Thysanura
• D. Collembola

Hint:

Entognatha = Mouthparts hidden inside the head (Collembola, Protura, Diplura).
Ectognatha = Mouthparts exposed (all true insects, including Thysanura/Silverfish).

Answer 1

The Correct Option is D

Step 1: Understanding the Concept:
Based on the positioning of the mouthparts, wingless hexapods are historically divided into Entognatha (internal mouthparts) and Ectognatha (exposed/external mouthparts).

Step 2: Detailed Explanation:
In entognathous hexapods, the mandibles and maxillae are sunken inside a pocket of the head capsule formed by the fusion of the genae and labium.
The class Entognatha includes the primitive wingless orders: Collembola (springtails), Diplura, and Protura.
All true insects (Class Insecta), such as Lepidoptera, Hymenoptera, and Thysanura (silverfish), possess ectognathous mouthparts that are exposed externally.

Step 3: Final Answer:
Entognathous mouthparts are found in Collembola, which is option (D).