Artistic view of a Male Pteronarcys californica (Pteronarcyidae) (Giant Salmonfly) Stonefly Adult from the Gallatin River in Montana

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What is this bug?

Diver has attached this picture to aid in identification. The message is below.

Diver
Northern Ontario

Posts: 2

Diver on Sep 11, 2016September 11th, 2016, 6:21 pm EDT

Hi there, I found this insect skittering on the surface of a lake. Is this a terrestrial insect that blew onto the water? I cannot find a similar picture. I thought it might be a caddis species. This was in northern ontario on a canadian shield lake.

Thank you, Richard

Taxon

Site Editor
Plano, TX

Posts: 1311

Taxon on Sep 11, 2016September 11th, 2016, 9:04 pm EDT

Hi Richard-

I believe it to be the aquatic moth, Lomographa semiclarata (Bluish Spring Moth).

Best regards,
Roger Rohrbeck
www.FlyfishingEntomology.com

Millcreek
Healdsburg, CA

Posts: 344

Millcreek on Sep 12, 2016September 12th, 2016, 7:53 am EDT

Roger,

I believe it to be the aquatic moth, Lomographa semiclarata (Bluish Spring Moth).

I think it's likely L. semiclarata as well, but it's not aquatic as far as I can determine. The larvae feed on alders, chokecerries, juneberries, hawthorns, poplars and Prunus sp. I can't determine where it pupates, but there are no references to underwater pupation.

Mark

"If we knew what it was we were doing, it would not be called research, would it?"
-Albert Einstein

Taxon

Site Editor
Plano, TX

Posts: 1311

Taxon on Sep 12, 2016September 12th, 2016, 8:53 am EDT

Mark-

Yes, I should have said non-aquatic. :-)

Best regards,
Roger Rohrbeck
www.FlyfishingEntomology.com

Millcreek
Healdsburg, CA

Posts: 344

Millcreek on Sep 12, 2016September 12th, 2016, 10:45 am EDT

Roger,

Just keeping you honest :).

"If we knew what it was we were doing, it would not be called research, would it?"
-Albert Einstein

Diver
Northern Ontario

Posts: 2

Diver on Sep 12, 2016September 12th, 2016, 12:15 pm EDT

Hello and thank you! I had a great deal of fun last night after posting using various keys trying to come up with the species. I did not come anywhere close to the right guess! Thanks again Taxon and Millcreek.