ptychonome
An enclosure formed (of leaves) by some organisms of the order Lepidoptera; a tentiform mine.
The ptychonome of messaniella containing an Apanteles cocoon is generally recognizable by its large volume, due to an increased maximal distance between the two epidermal layers,
Where it comes from
From ptycho- (compare ptychography) + (-)nome, from Ancient Greek πτυχή (ptukhḗ, “fold”) + νομός (nomós, “division”).
Adapted from the Wiktionary entry ptychonome (CC BY-SA 4.0).