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Home » Guide » Arthropods (Arthropoda) » Hexapods (Hexapoda) » Insects (Insecta) » Beetles (Coleoptera) » Adephaga » Predaceous Diving Beetles (Dytiscidae) » Dytiscinae » Dytiscus » Boreal Water Beetle (Dytiscus alaskanus)
Photo#355013
Boreal Water Beetle - Dytiscus alaskanus - male
Copyright © 2009 Robyn Waayers

Boreal Water Beetle - Dytiscus alaskanus - Male
Steinaker Reservoir, Uintah County, Utah, USA
August 14, 2002
Size: 27 mm
Came to a light at night.

Images of this individual: tag all
Boreal Water Beetle - Dytiscus alaskanus - male Boreal Water Beetle - Dytiscus alaskanus - male Boreal Water Beetle - Dytiscus alaskanus - male
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Contributed by Robyn Waayers on 27 November, 2009 - 11:51am
Last updated 27 November, 2009 - 8:40pm

Moved
Moved from Dytiscus.
… Tim Loh, 27 November, 2009 - 6:46pm login or register to post comments

Either D. circumcinctus or D. alaskanus
Based on the acuminate (pointed) metacoxal lobes as seen in the ventral view and smaller size (eliminates D. dauricus, which is alot larger). To confirm D. circumcinctus check for the yellow ring around the inner margins of the eyes (see guide pages for examples), which I can't see in the images. D. alaskanus is another possibliity but the species usually has more expanded black markings on the abdominal sterna- this might well be a paler variant.
… Tim Loh, 27 November, 2009 - 1:40pm login or register to post comments

 
It does not seem to have the
It does not seem to have the yellow around the eyes that you described and that was visible in your image, although there almost seems to be a very thin yellow line (that was only visible in the photo -- didn't see it "in the flesh"). I'm going to add an image of the face so you can see it too!
… Robyn Waayers, 27 November, 2009 - 4:12pm login or register to post comments

 
D. alaskanus
The yellow ring is incomplete and reduced, eliminating D. circumcinctus. Therefore this can only be D. alaskanus and the ventral colouration indicates an atypical pale variant as illustrated in Larson (2000).
… Tim Loh, 27 November, 2009 - 6:43pm login or register to post comments

 
Interesting!
Thanks very much for these IDs.
… Robyn Waayers, 27 November, 2009 - 8:36pm login or register to post comments

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