difference between O. nuchicornis and Onthophagus Fracticornis.

I'm working on a thesis about dung beetles and I have a burning question about the two following species:

O. nuchicornis and Onthophagus Fracticornis.

Does someone know some distinctive characteristics to seperate these two species?

greetings

Stefan

 
Hi

Youre link will certainly help. I just find that the curve of the pronotom is not always that obvious.

I let you know what I have founded.

greetings

 
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