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DryflyMarch 18th, 2007, 11:39 am
rochester mn

Posts: 133
caught in riffle about 2 cm long any ideas on what genus it might be
TaxonMarch 18th, 2007, 3:15 pm
Site Editor
Plano, TX

Posts: 1299

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
DryflyMarch 18th, 2007, 3:32 pm
rochester mn

Posts: 133
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

GONZOMarch 18th, 2007, 4:23 pm
Site Editor
"Bear Swamp," PA

Posts: 1681
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.
TaxonMarch 18th, 2007, 5:50 pm
Site Editor
Plano, TX

Posts: 1299

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 thatís what my guess would be.
Roger Rohrbeck
GONZOMarch 18th, 2007, 7:57 pm
Site Editor
"Bear Swamp," PA

Posts: 1681
Really nice deductive reasoning, Roger!
TaxonMarch 18th, 2007, 8:57 pm
Site Editor
Plano, TX

Posts: 1299
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
GONZOMarch 18th, 2007, 9:26 pm
Site Editor
"Bear Swamp," PA

Posts: 1681
I know what you mean, Roger, but I still think it was an impressive application of both logic and resources. :)
DryflyMarch 19th, 2007, 4:08 am
rochester mn

Posts: 133
thanks taxon and gonzo for your quick replies
I appreciate it
i'll post pics of the larva out of the case later today

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