Morphological Identification of Instar Stages in Black Soldier Fly (Hermetia illucens)

I am seeking guidance on accurately determining the instar stage of black soldier fly (Hermetia illucens) larvae. The correct identification of instar stages is crucial for optimizing rearing conditions, understanding developmental biology, and ensuring the quality of these insects for various applications (e.g., animal feed, bioremediation).

Could anyone provide detailed information on the following:

1. Morphological characteristics distinguishing each instar stage (e.g., head capsule size, body length, spiracle shape)?

2. Reliable methods for measuring and recording these characteristics?

3. Any existing literature or resources (e.g., identification keys, diagrams) that could aid in instar stage determination?

Thank you for your contributions to this question.