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genus Amara? - Anisodactylus caenus

genus Amara? - Anisodactylus caenus
Medford, (~25 miles east of Philadelphia, PA) Burlington County, New Jersey, USA
June 26, 2007
Size: ~8.5mm

Images of this individual: tag all
genus Amara? - Anisodactylus caenus genus Amara? - Anisodactylus caenus


Moved from Anisodactylus.

Moved from Harpalinae.

Harpalini : Anisodactylus considered
Tim, I really like the photographic quality of your many recent carabid contributions to BugGuide. I wish had more free time to comment on them so I will have to limit myself to those few cases where I differ in opinion. Boris is on the right track for this female specimen. Against Amara and for Anisodactylus is one supraorbital setigerous puncture, setigerous punctures on elytra (3rd interval), absent setae on pronotal hind angle, mentum-submentum juncture line fused laterally, absent mentum tooth (therfore not closely related Notiobia). Small body size (8.5 mm) would limit choices to Anisodactylus caenus vs laetus in your area. I have not seen these two before (not in WI), but I feel A. laetus is more likely based on Lindroth's species account of the pronotum: widest near middle & lateral explanation clearly to front for A. laetus vs widest near base & lateral explanation fading before front for A. caenus. Legs are not entirely pale as expected for A. laetus. Incidentally, this subgroup of Anisodactylus is described as having an "Amara-like habitus". Interesting!

Moved to Anisodactylus caenus
following an insightful discussion by Brad Barnd.

Thanks Peter,
Thanks for taking the time to explain this one in such detail! And thanks for the complement on the photos. The set-up has taken me a while to work out, and it really only works on preserved specimens. But I'm also happy (mostly) with the results, given the sub-$500 equipment producing them.

And if you'd like any specific specimens for reference, I'd be happy to keep my eyes out for duplicates this summer.

looks like it, yes
but I can see only one pair of supraorbital setae, Ama*ra is supposed to have 2, insofar I remember.