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Silk producing beetle larva?

Last night I watched the 4th part of a PBS program on the history of India. In the introduction the host held in His hand a cluster of pepper corns, some rice grains and a tuft of fibers which He identified as silk produced by the larva of a beetle. I can not find any information on the web about silk being produced by a beetle. I have always thought of silk being produced by moth larva and of course spiders.
Does anyone have any information on this?

Quite a few beetles
produce silk. The genus Cryptolestes (Laemophloeidae) does and could be what was shown from India. A paper (and references therein) on silk production in beetles is:

Frank, J.H., Thomas, M.C. 1984. Cocoon‑spinning and the defensive function of the median gland in larvae of Aleocharinae (Coleoptera, Staphylinidae): a review. Quaest. ent. 20: 7-23.

 
Paper
Do you have a digital copy of that paper by any chance?

Charles, some other silk-producing beetles include Hypera weevils (the initially proposed ID for your spongillafly cocoon), Ophraella leaf beetles (which make similar cocoons), and water scavenger beetles (Hydrophilidae), which make silken egg cases--no photos of these seem to exist, but I've seen a number of illustrations.

 
silk
Thanks Charley.
I wonder if this type of silk was ever used to make fabric ?

 
silk
Michael, thanks for the information.

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