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20161007OA02 - Discoderus aequalis

20161007OA02 - Discoderus aequalis
San Antonio, Bexar County, Texas, USA
October 7, 2016
size around 9 mm

Images of this individual: tag all
20161007OA02 - Discoderus aequalis 20161007OA02 - Discoderus aequalis 20161007OA02 - Discoderus aequalis

Moved from Discoderus congruens. More likely D. aequalis than congruens based on large body size (~ 9 mm here), body not perceptibly narrow-cylindrical, hind angles sufficiently deplanate, not Arizona location. In studying multiple Texas series, I find that D. aequalis is capable of much intraspecific variation underscored by the extreme end forms observed in individuals taken from the same collection event. The two end forms of this morphological continuum are large, robust, typical "D. aequalis Casey" versus small, narrower, subcylindrical "D. peregrinus Casey". The latter form approaches the perceptibly true "D. congruens Casey" which appears constant in Arizona. The apparent intraspecific variation of D. aequalis in Texas will likely account for several new Casey synonyms anticipated in our study. "D. aequalis" would be the senior name.

Moved from Discoderus.

Moved from Ground Beetles.

I'm pretty sure -- a genus I'm researching.

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