Identification, Images, & Information
For Insects, Spiders & Their Kin
For the United States & Canada
 

Register · Log In
HomeGuideID RequestRecentFrassForumsDonateHelp
Clickable Guide
Moths Butterflies Flies Caterpillars Flies Dragonflies Flies Mantids Cockroaches Bees and Wasps Walkingsticks Earwigs Ants Termites Hoppers and Kin Hoppers and Kin Beetles True Bugs Fleas Grasshoppers and Kin Ticks Spiders Scorpions Centipedes Millipedes

Calendar
Upcoming Events

Registration is open for the 2024 BugGuide gathering in Idaho July 24-27

Moth submissions from National Moth Week 2023

Photos of insects and people from the 2022 BugGuide gathering in New Mexico, July 20-24

Photos of insects and people from the Spring 2021 gathering in Louisiana, April 28-May 2

Photos of insects and people from the 2019 gathering in Louisiana, July 25-27

Photos of insects and people from the 2018 gathering in Virginia, July 27-29


Previous events
TaxonomyBrowseInfoImagesLinksBooksData
Home » Guide » Arthropods (Arthropoda) » Hexapods (Hexapoda) » Insects (Insecta) » Beetles (Coleoptera) » Adephaga » Predaceous Diving Beetles (Dytiscidae) » Agabinae » Agabini » Ilybius » Ilybius biguttulus
Photo#1481578
Ilybius biguttulus
Copyright © 2018 Marci Hess

Ilybius biguttulus
Argyle township, Lafayette County, Wisconsin, USA
August 5, 2017
Size: 11mm
Caught in solar bucket trap

Images of this individual: tag all
Ilybius biguttulus Ilybius biguttulus Ilybius biguttulus
tag · login or register to post comments
Contributed by Marci Hess on 2 January, 2018 - 3:42pm

Pardon me for asking
but is the measurement for this specimen precise or just a guess?
… Claude Tessier, 7 January, 2018 - 3:04pm login or register to post comments

 
I used a ruler.
It's not a super accurate metric ruler but I'm confident this size is within 1/2 mm or so.
… Marci Hess, 7 January, 2018 - 3:54pm login or register to post comments

 
Then it could be 10,5 mm long
Because I did see many many I.biguttulus but none were that long. If the measure is more on the 11 side then, for your area, you are left with three species: I. subaeneus, I. pleuriticus and I. confusus. It would be interesting to take another look at that specimen to see if it still holds...For myself I can't say just by looking at these images.
… Claude Tessier, 7 January, 2018 - 8:34pm login or register to post comments

 
I re-measured.
It's definitely between 10-11mm. According to Evans book on Beetles of Eastern North America this species is 8.4-11.4mm. I looked at I. pleunticus and don't see the white spots on the lower elytra in those photos that I could see. I. subaeneus and I. confusus are special concern listings here in Wisc. I'm meeting with a local beetle expert on Wed. I'll see if he can determine which species this is. Thanks for all your help.
… Marci Hess, 8 January, 2018 - 11:22am login or register to post comments

 
ID confirmed
Striations on hind coxal plate and side are diagnostics. Hind margin of pronotum and head have a reddish, rather transparent margin.(1) Det Jordan Marche'
… Marci Hess, 11 January, 2018 - 2:21pm login or register to post comments

 
Good!
Thank you for the information!
… Claude Tessier, 14 January, 2018 - 4:39pm login or register to post comments

Comment viewing options
Select your preferred way to display the comments and click 'Save settings' to activate your changes.

Disclaimer: Dedicated naturalists volunteer their time and resources here to provide this service. We strive to provide accurate information, but we are mostly just amateurs attempting to make sense of a diverse natural world. If you need expert professional advice, contact your local extension office.

Contributors own the copyright to and are solely responsible for contributed content.
Click the contributor's name for licensing and usage information.
Everything else copyright © 2003-2024 Iowa State University, unless otherwise noted.

Bugguide is hosted by:

Plant Pathology, Entomology and Microbiology at Iowa State University logo

Printer Friendly Version 		Terms of Use
Privacy Statement
Site Map
Contact