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carabid - Stenocrepis

carabid - Stenocrepis
Cove Point, Calvert County, Maryland, USA
June 16, 2019
Size: ~9mm estimated from photo
To my inexperienced eye, the head seems rather long and narrow for this to be an Amara. Something in tribe Oodini?
Found in a wooded area on the edge of a marsh and not far from Chesapeake Bay. Stenocrepis has been reported from this Maryland county (1) although it appears to be quite rare here.
Thanks for the help

Moved from Oodini.

Thanks again Peter. Another beetle I should have brought onside for better photos...

Moved from Ground Beetles.

Thanks Peter. Moved to tribe for now. I'll try to get comfortable with a genus but success seems unlikely :-)

Yes, tribe Oodini
is my first reaction. Check out the genus pages to see what you're comfortable with.

Here's another chance for me to make a fool of myself
Of the 7 genera in this tribe, I think 5 can be eliminated easily:
Oodinus: range is given as "Neotropical north to FL & TX"
Evolenes: no images online, American Beetles says "eye not prominent" (1) which doesn't fit
Dercylinus: ruled out by lack of lateral depressions on either side of pronotum, rare and out of range
Lachnocrepis: ruled out by lack of "pale hind angles" on pronotum
Anatrichis: ruled out by lack of basal depressions on either side of pronotum

That leaves Oodes and Stenocrepis. The features needed to separate the 2 in the American Beetles key aren't visible in this photo and I can't see a difference applicable to my photo in the photos available on BugGuide. If I had to guess which one it was, I'd probably pick Oodes which seems to be a shorter, stouter beetle than Stenocrepis. Oodes has also been collected at Cove Point (2). The nearby marsh is mostly Phragmites but there are cattails as well. The guide lists cattail marshes as habit for Oodes fluvialis but I don't know if that applies to other species of Oodes.


Stenocrepis is a better fit than ...
more robust, more oval Oodes in my opinion. Bousquet 2012 reports two spp known in MD: S. cuprea vs S. duodecimstriata. In scoping my reference examples today, I was struck by these differences: coppery luster, elytral striae prominently punctate, dark femora against light tibiae vs striae smooth or finely punctulate at most, legs evenly dark. The two are easily distinguished under scope, but interpreting images is another matter.

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