This "specimen" is actually two caddis larvae fighting each other over a case. The case is a hollow tube; one larva would go in the back end, presumably bite the other, and chase it out. The invader crawled forward into the case while the other one fled, and then it went around to the back and bit the first one. They did this several times, and I recorded it on video.
This caddisfly was collected from unknown on March 1st, 2004 and added to Troutnut.com on January 25th, 2006.
Two Phryganeidae caddis larvae fighting over a case
Not sure why I didn't see this before - just another hidden wonder on your site I guess. Did you notice they seem to run around the short side of the case? I suspect they should know what side is the short side is but still..... why? Energy conservation doesn't make alot of sense since if they were conserving energy it would seem they would have quit alot earlier. What happened after they stopped? Did they start over? I thought they would have tired out way before they did. Did you have a hot light on the tray? absolutely fascinating! Thanks
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Larvae: Many classes of aquatic insects, such as caddisflies, midges, craneflies, dobsonflies, alderflies, and many more, are known as "larvae" rather than "nymphs" in their juvenile stages. They have mostly soft bodies rather than hard exoskeletons. These insects also advance through a "pupa" stage before reaching adulthood.