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Amara ? - Amara crassispina - female

Amara ? - Amara crassispina - Female
Allison Park, Allegheny County, Pennsylvania, USA
February 20, 2014
Size: 8mm
Found wandering across the snow, temp. around 40 deg. I have the live specimen if needed.

Images of this individual: tag all
Amara ? - Amara crassispina - female Amara ? - Amara crassispina - female Amara ? - Amara crassispina - female

Amara crassispina LeConte, female
Moved from Seed-Eating Ground Beetles. Tentatively ID'd from specimen, now a photo-voucher. Thanks John.

This is a difficult species group that probably needs male genitalia to be sure of species ID. But external characters seem to favor A. crassispina over the other possibilities.

A character for A. crassipina omitted by Heike (2003)
in his revisionary key to the "cupreolata group" is the rather unique thickening of the apical spur on the protibia. Latin "crassispina" = "thick spine". Both Lindroth (1968) and Ciegler (2000) mention this trait. Bousquet (2010) refines species separation based on the shape of the apical spur. Having a couple examples in my collection, I feel that the published external morphologies of A. crassipina are sufficient for reliable separation of species.

Several characters
including of course the thickened, non-acute spur occur on this beetle. Bousquet (2010) also mentions that the anterior bead of the pronotum is raised distinctly above the surrounding surface as well as the microsculpture of the pronotum being distinct in the middle.

It's noted in the next couplet the difference in placement of the posterior setigerous puncture, and its depression, are of note in separating A. cupreolata and A. neoscotica. He doesn't note the character state for A. crassispina, and I wonder what it is. Presumably it is close to the edge with the depression touching the bead as in A. neoscotica??

Pronotal posterolateral seta way closer to basal margin
than from the lateral margin in my specimens of A. crassipina.

Thanks for the diagnostic detail
I wish I would have gotten a photo of the spur. It is visible in a couple of the other photos posted by Tom Murray.

i'm very pleased with the result, too!
sick and tired of tramp species... like myself.
thanks, guys

Thank you Brad!

Moved from Beetles.

yes, definitely
suggest sending carabid specimens (esp. though ones) to Peter Messer or Brad Barnd for identification
hope it's a native one

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