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Home » Guide » Arthropods (Arthropoda) » Hexapods (Hexapoda) » Insects (Insecta) » Beetles (Coleoptera) » Polyphaga » Series Elateriformia » Byrrhoidea » Water Penny Beetles (Psephenidae) » Psepheninae » Psephenus
Photo#1717389
river beetle - Psephenus
Copyright © 2019 Robin McLeod

river beetle - Psephenus
Ailsa Craig, Middlesex, Ontario, Canada
August 3, 2019
Size: <10 mm
on moss in middle of river with strong current
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Contributed by Robin McLeod on 25 August, 2019 - 10:46pm
Last updated 18 May, 2023 - 5:17pm

Moved
Moved from Water Penny Beetles.
… v belov, 18 May, 2023 - 5:17pm login or register to post comments

Moved
Moved from Ectopria leechi.

As stated by others, probably Psephenus, and not Ectopria. Feel free to move this.
… Arturo Santos, 29 July, 2022 - 11:25pm login or register to post comments

Moved
Moved from ID Request.
… Brady Richards, 25 August, 2019 - 10:53pm login or register to post comments

 
Psephenus?
To me this has more of a Psephenus gestalt. What points to Ectopria over Psephenus?
… Jeff Gruber, 13 July, 2021 - 8:06am login or register to post comments

 
I see what you mean...
In other BugGuide images IDed as Ectopria the rear margin of the pronotum is relatively straight, but in most images IDed as Psephenus the rear margin of the pronotum appears to have two concave sinuses that the convex lobes at the base of the elytra "fit into".
Examples:

Also, in my photo and the three thumbnails above, the first antennomere is noticeably longer than the second, and there are 11 segments, whereas in Ectopria the first antennomere is about the same length or even shorter than the second, and there are only 10 segments (either that or the second segment is very tiny and could be mistaken for a constriction of the distal end of the first segment). Example:
… Robin McLeod, 17 October, 2021 - 12:28pm login or register to post comments

 
Thanks, Brady
I had never seen one.
… Robin McLeod, 25 August, 2019 - 11:14pm login or register to post comments

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