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Home » Guide » Arthropods (Arthropoda) » Hexapods (Hexapoda) » Insects (Insecta) » Beetles (Coleoptera) » Adephaga » Predaceous Diving Beetles (Dytiscidae) » Colymbetinae » Colymbetini » Hoperius » Hoperius planatus
Photo#1970325
on light sheet - Hoperius planatus - male
Copyright © 2021 Paul Bedell

on light sheet - Hoperius planatus - Male
Chesterfield County, Virginia, USA
May 19, 2021
Size: large, 15mm or more
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Contributed by Paul Bedell on 20 May, 2021 - 2:54pm
Last updated 12 March, 2022 - 11:13am

Moved
Moved from Predaceous Diving Beetles.
… Matthew Pintar, 12 March, 2022 - 11:13am login or register to post comments

Moved
Moved from Hydaticus.
… Matthew Pintar, 29 May, 2021 - 5:05pm login or register to post comments

Cannot be Hydaticus
If I see correctly, the pronotum has a lateral bead, therefore it cannot be a Hydaticus species. That being said and looking at the coarse meshes on pronotum and elytra, I would suggest an Agabinae sp. (perhaps Agabus). Hydaticus have small meshes.
… Claude Tessier, 27 May, 2021 - 7:04am login or register to post comments

 
Ah yes, would explain why the
Ah yes, would explain why the protarsi do not match Hydaticus. Odd coloration that I am not familiar with in Agabini though
… Matthew Pintar, 29 May, 2021 - 5:04pm login or register to post comments

 
Agabus sp. or Hoperius planatus
...lateral margins of pronotum with bead, scutellum present, metatarsal claws are equal(?) places this guy in the Agabini. The only genus it could be in is Agabus, but according to Larson et al (2000) and Miller and Bergsten (2016) Agabus would max out at 14 mm.

HOWEVER, if the metatarsal claws are unequal, this would certainly be Hoperius planatus. The beetle looks very flat dorsally and if you zoom in on the elytra it is coarsely reticulate. Hoperius planatus is 12-14 mm in length.
… Jeffrey A Back, 27 July, 2021 - 2:11am login or register to post comments

 
Spangler 1973 could provide insight
https://www.biodiversitylibrary.org/page/34560591#page/469/mode/thumb
… Jeffrey A Back, 27 July, 2021 - 2:37am login or register to post comments

Moved
Moved from Predaceous Diving Beetles.

Looks most like H. piceus, though unusually far south for that species; indeed the furthest south.
… Matthew Pintar, 21 May, 2021 - 10:22am login or register to post comments

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