youth case

Coleophoridae larve in self-made tubes. Som species are capable to enlarge the tubes in pace with their growth,
but other species once of twice have to construct a new one. The first tube then often not only in size but also in shape differs appreciably from the later one(s).

Coleophora serratella youth case

Coleophora serratella,youth case

Coleophora serratella case

For comparison, the case of the older larva