Troutnut Forum > Get Bugs Identified > caddis
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| Dryfly | March 18th, 2007, 2:39 pm | |
| rochester mn Posts: 26 | caught in riffle about 2 cm long any ideas on what genus it might be | |
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| Taxon | March 18th, 2007, 6:15 pm | |
| Mercer Island, WA Posts: 483 | Dryfly- It appears that the larval case is flattened on the bottom, as opposed to being cylindrical. Is that true? It also appears that the case is made entirely of plant material, as opposed having rock particles incorporated in its construction. Is that true? | |
| Roger Rohrbeck www.FlyfishingEntomology.com | ||
| Dryfly | March 18th, 2007, 6:32 pm | |
| rochester mn Posts: 26 | taxon it is under water so that is why it appears to be flat. it is cylindrical the case it made primarily with fine pieces of rock with some sticks toward the back this may help I collected it in se minnesota | |
| GONZO | March 18th, 2007, 7:23 pm | |
| "Bear Swamp," PA Posts: 876 | Roger, I was also deceived by the optical illusion caused by the water. Dryfly, if you could extract the larva from the case without damage and rephotograph it, the identification should be easier. Perhaps Roger, Konchu, or David would then be better equipped to nail it down with the additional information that would be provided. | |
| Taxon | March 18th, 2007, 8:50 pm | |
| Mercer Island, WA Posts: 483 | Dryfly- The only family of caddisflies (of which I am aware), which builds stout, cylindrical, not gradually tapered or curved cases, made mainly or entirely of rock fragments, and would also be as large as your specimen is Limnephilidae. The following Limnephilidae species reside in Minnesota: Frenesia missa Limnephilus indivisus Limnephilus sericeus Limnephilus submonilifer Pycnopsyche guttifera Pycnopsyche lepida Pycnopsyche scabripennis Platycentropus radiatus Onocosmoecus unicolor Hesperophylax designatus Hydatophylax argus Of those, only Fresnia missa (Dot-Winged Sedge), and Hesperophylax designatus (Silver Stripe Sedge) build cases resembling those of your specimen. Fresnia missa only reaches a length of 13.5 mm, whereas Hesperophylax designatus reaches a length of 20 mm., so that’s what my guess would be. | |
| Roger Rohrbeck www.FlyfishingEntomology.com | ||
| GONZO | March 18th, 2007, 10:57 pm | |
| "Bear Swamp," PA Posts: 876 | Really nice deductive reasoning, Roger! | |
| Taxon | March 18th, 2007, 11:57 pm | |
| Mercer Island, WA Posts: 483 | Really nice deductive reasoning, Roger! Thanks, Gonzo. However, there is (at least) one caddisfly specialist who frequents this site, so I'm kind of waiting for "the other foot" to fall! | |
| Roger Rohrbeck www.FlyfishingEntomology.com | ||
| GONZO | March 19th, 2007, 12:26 am | |
| "Bear Swamp," PA Posts: 876 | I know what you mean, Roger, but I still think it was an impressive application of both logic and resources. :) | |
| Dryfly | March 19th, 2007, 7:08 am | |
| rochester mn Posts: 26 | thanks taxon and gonzo for your quick replies I appreciate it i'll post pics of the larva out of the case later today | |
| DMM | April 6th, 2007, 11:52 pm | |
| Posts: 141 | I believe that I see markings on the head of this caddis. This would put it in the subfamily Limnephilinae, tribe Limnephilini. In this tribe, only the genus Limnephilus seems likely. | |
| David | ||
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