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Photo#630814
Dytiscus ??? - Dytiscus dauricus - female

Dytiscus ??? - Dytiscus dauricus - Female
Dillon, Beaverhead County, Montana, USA
April 10, 2012

Images of this individual: tag all
Dytiscus ??? - Dytiscus dauricus - female Dytiscus ??? - Dytiscus dauricus - female Dytiscus ??? - Dytiscus dauricus - female Dytiscus ??? - Dytiscus dauricus - female Dytiscus ??? - Dytiscus dauricus - female

Moved
Additional images of the elytral sulci confirm that this is D. dauricus..my bad

Moved
Moved from ID Request.

This is either D. alaskanus o
This is either D. alaskanus or D. dauricus. I have collected both species from neighboring Alberta. Provision of body size would be useful- D. dauricus is the larger of the 2 (30-40 mm for D. dauricus vs.~23-30 mm for D. alaskanus). Also elytral stria 8 & 9 of sulcate females are not fused apically (posteriorly) in D. dauricus (fused in D. alaskanus). I can't really see this clearly in the image but you can double check this since you have the specimen. My best guess is D. alaskanus as it is the more common of the 2 at least from where I've collected it.

 
D. alaskanus
I've added another couple of images. If I am counting and interpreting striae correctly, they are fused, making this a rather large D. alaskanus. Correct?

I appreciate the assistance - thank you!

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