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LittleJMay 16th, 2010, 3:18 pm
Hollidaysburg Pa

Posts: 251
So while flipping rocks today I had an interesting find. There were caddis pupa tethered to the bottom of the rock in what looked like a clear tube. To the people that know about these types of things. Would this be the pupal case they make after leaving their rock case, right before they emerge? Or could their case have broken apart and this would be what they would look like inside their case. Either way it was cool to get a look at a caddis pupa unharmed prior to emergance.

Jeff
CrenoMay 16th, 2010, 7:08 pm
Grants Pass, OR

Posts: 298
Was the "case" tan colored, and sorta inflated like a balloon? If so, sounds like a Rhyacophila pupa. Search on Rhyacophila above for a picture. The "case" is a cocoon that the larva makes within the actual pupal case. A couple families (rhyacophilds, glossosomatids hydrobiosids) make these internal cocoons within the case. The fact that you found just the case suggests a rhyacophild since they make very loose collections of stones for their pupal case. Often the case is connected to a couple rocks so when you pick up a rock the case separates stays with one rock and the pupal cocoon is still attached to another. If your critter didn't have the tan cocoon let us know and I will make another guess :-)
LittleJMay 16th, 2010, 7:17 pm
Hollidaysburg Pa

Posts: 251
Thanks creno! I don't believe that the case was Tan. It really just looked like a clear plastic tube. However the Ryachophila sounds good enough for me.

Thanks
CrenoMay 16th, 2010, 7:43 pm
Grants Pass, OR

Posts: 298
If it was a tube, with a hole at either, or both ends, it probably wasn't a rhyacophilid. Rhyacophila cocoon are pretty distinctive and Jason's picture is very good.
http://www.troutnut.com/specimen/560

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