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Colymbetes sculptilis
Photo#158936
Copyright © 2007
Janice Stiefel
Mid-Sized Diving Beetle -
Colymbetes sculptilis
Town of Baileys Harbor, Hidden Corners Sanctuary, Door County, Wisconsin, USA
July 3, 2004
Size: 3/4 in. long
Adult came to night light, probably came out of our pond, which is close by.
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Contributed by
Janice Stiefel
on 29 November, 2007 - 10:26am
Last updated 29 November, 2007 - 4:10pm
Moved
Moved from
Understriped Diving Beetle
.
…
Eric R. Eaton
, 29 November, 2007 - 12:49pm
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rather, Colymbetes
Correct family, but this is
Colymbetes sculptilis
Harris, rather than Dytiscus. You can see the hundreds of wavey groves running across the elytra, particually near the lateral edges, characteristic of Colymbetes (see
). The overall size, and coloration on the pronotum also fit Colymbetes rather than Dytiscus. If you have an image of the eyes from the front or side, you should see that they are emarginate above the antenna (a piece of the head above where the antenna are inserted protrudes backward overtop of the middle front edge of each eye).
Downie and Arnett list 3 species for our area. Yours appears to best fit C. sculptilis. Images of all three types are online at the MCZ, C. sculptilis
here
. Check the head-on shot to see the eye emargination.
Nice find, and another new species for BugGuide :)
…
Tim Moyer
, 29 November, 2007 - 11:38am
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Thank You!
WOW! What a thorough, detailed answer. It makes sense to me. According to Alberta's "Talk About Wildlife" Website, the Common Name is Mid-Sized Diving Beetle. Thank you for taking the time on this ID.
…
Janice Stiefel
, 29 November, 2007 - 3:55pm
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