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Amara 3 - Amara angustatoides

Amara 3 - Amara angustatoides
Lawrence County, Indiana, USA
May 21, 2005
Size: 6.5 mm
Amara angustata. A species with three subapical setae on stria 7, pronotum not constricted at its base, and a trifid (three-pronged) spur on the front tibia. Separated from the similar A. pall*ipes but having the basal pronotal setae well removed from the margin and having at least part of antenomere 4 pale.

Based on Peter's comments below, this should be A. angustatoides rather than A. angustata.

Images of this individual: tag all
Amara 3 - Amara angustatoides Amara 3 - Amara angustatoides

Amara angustata species group -revision by Hieke (2000)-
includes in my WI area the three externally similar species (1) A. angustata (uncommon), (2) A. angustatoides (common), and (3) A. flebilis (rare). All are reliably separated via male genitalia. From Hieke's paper (German), I have selected the following subtle features most helpful to me for external separation of species 1, 2, 3.

1: small (most ~6mm); front pronotal angles barely projected forward.
2: slightly larger (almost all =/> 6.5 mm); front angles more projected.
3: easiest to separate based on pronotum with distinct coarse punctures laterobasally and more angulated hind angles (less rounded) compared to 1 & 2.

Based on these criteria my educated guess is that size and pronotum shown in your image better fits A. angustatoides.

Will rename.

Is this the paper you are refering to?: "HIEKE F. 2000: Revision einiger Gruppen und neue Arten der Gattung Amara Bonelli, 1810 (Coleoptera: Carabidae).- Annales Historico-Naturales Musei Nationalis Hungarici, 92, 41 - 143."

of which only pages 41 - 83 appear to pertain to our midwest area, i.e., the Amara angustata and Amara impuncticollis species groups revised by Fritz Hieke. My identification based on your image is of course tentative until you can scope specimen using Hieke's illustrated keys. I routinely do genitalic dissections (so far only males) for these externally-difficult species groups which makes species determination quite secure as specified by Hieke.

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