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large darkling beetle - Eleodes spinipes

large darkling beetle - Eleodes spinipes
Candelaria, Presidio County, Texas, USA
October 1, 2018
Found near the Rio Grande. After checking range maps, this is the only local species of this size/look.

Eleodes spinipes - almost certainly
Note the pointed anterior pronotal angles. I believe this is a female of E. spinipes macrura Champion - but can't be sure from this image. Most of the other images on bugguide seem to be the subspecies E. spinipes ventricosa

Moved from Eleodes carbonaria.

How large was it?

about 25-30 mm
The large size is how I was pretty sure it wasn't E. debilis, whch sort of looks the same and is also found in the area. That species is on the small side for Eleodes while this was impressively not.


BugGuide range maps are not complete
do not use them for ruling out morphologically similar species.

BG map data points are random based on submissions and do not reflect the full spectrum of options in nature.
I am not saying your ID is wrong, I am saying your justification is not adequate for species-level confirmation.

Didn't use BugGuide
The range maps for BG are far too general and incomplete. I used a PDF of Triplehorn and Thomas' 2011 study of the genus, which gives precise data points.

super, thanks for the confirmation!

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