What is the pupal case formed by insects undergoing complete metamorphosis known as?

The pupal case formed by insects undergoing complete metamorphosis is referred to as a cocoon or chrysalis, depending on the insect. Although the answer provided mentions "Insect case," this term could be seen as a broad descriptor for the protective structure surrounding the pupa.

Insects that undergo complete metamorphosis have four distinct stages: egg, larva, pupa, and adult. During the pupal stage, the insect undergoes significant internal and external changes to transition from the larval form to the adult form. This stage is often marked by the pupal case's protection, which allows for the complex transformations necessary for the development of the adult insect.

The other terms listed do not accurately represent the pupal case used in entomological contexts. “Larval shell” inaccurately describes the protective covering of a larva rather than a pupa, while “Pupa body” and “Metamorphosis capsule” do not align with established terminology in insect development and do not convey the specific nature of this life stage.