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3. Caddis pupae beards

Can anyone tell me the technical name to the beard on the ventral side below thorax on caddis pupae? I tie a few patterns with this imitated beard but was always curious to know the technical name for this morphological part. Thank you!

Here is a pattern I came up with a few years back with beard. I call it a 'Pure Caddis'

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The technical name for the beard on a caddis imatation is probably "beard". But there are others I suspect will have their own names :-) That is a nice looking fly.

I imagine the beard is envisioned by fly tiers to represent the legs of the pupae.

"Beard hackle" or simply "beard" is a term in fly tying used to describe the method of hackling a nymph or wet fly where the hackle is mounted under the body only. Another term commonly used for this method is "throat hackle" or "throat", especially when referencing streamers. Used on caddis imitations the intention is to imitate the trailing legs as Creno suggested. Whether it succeeds at this is debatable, especially since a beard hackle without a substantial wing mounted on top will make a fly drift upside down. There is no use of the term in caddis morphology that I'm aware of.