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Limnephilid - Onocosmoecus

Limnephilid - Onocosmoecus
Bow River, Calgary, Alberta, Canada
April 10, 2009
Size: ~11 mm body
Collected from underneath a rock submerged in the river.

Images of this individual: tag all
Limnephilid - Onocosmoecus Limnephilid - Onocosmoecus Limnephilid - Onocosmoecus Limnephilid - Onocosmoecus


Moved from Lepidostoma.

Not that bizzare
but probably not Lepidostoma. Probably a limnephilid and the thoracic stripe and and what appear to be multiple gills may lead you to the dicosmoecins. But not enough info for me to be sure.

Thanks for the correction
I gave the specimen another look and it has a small dorsal hump on ab segment 1 which I didn't notice before. It also explains why the case doesn't seem to match. Will have to rekey this one...placing this in the correct family for now.

The verdict...
It is an Onocosmoecus and I'm actually more convinced that this is the right ID. The pale median stripe down the pronotum and mesonotum is diagnostic. Also the tibia only has 1 pair of apical spurs and the metanotal sa1 sclerites are separated.

but don't put too much faith in the stripe alone. Other discosmecins have them and some Onocosmoecus specimens will not have a very obvious stripe.

that's true
Amphicosmoecus has it too and both genera are found in Alberta; however Onocosmoecus has separated sa1 metanotal sclerites (seen here) while Amphicosmoecus has a single fused sclerite.

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