Puparium

…The slug moth makes a hard, elliptical cocoon (slug cocoon) made of calcareous matter. The pupa of flies is unique in that the skin of the final stage larva hardens and becomes pigmented, forming a puparium, in which the fly pupates. The pupal stage is an intermediate stage between the larvae and the adult, which are completely different in terms of morphology, habitat, and food. …

*Some of the terminology explanations that mention "puparium" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…イラガは石灰質の楕円形の硬い繭(イラガノマユ)をつくる。ハエ類のさなぎは特異的で，終齢幼虫の皮膚が硬化･着色し囲蛹殻pupariumを形成し，この中で蛹化する。　蛹期は形態，生息場所，餌などまったく異なる幼虫と成虫をつなぐための中間段階である。…

※「puparium」について言及している用語解説の一部を掲載しています。

出典｜株式会社平凡社世界大百科事典 第２版について | 情報