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unknown beetle - Rhizophagus sayi

unknown beetle - Rhizophagus sayi
Frontenac,, Crawford County, Kansas, USA
October 20, 2015
Size: 2.7 mm
Taken in a pan trap.

Moved from Rhizophagus.

Moved from ID Request.

Guess: Monotomidae
Something close to this one?

Yes, Rhizophagus
You are right for Rhizophagus, however, it isn't R. sayi. This specimen is less elongated and have serrate pronotum at base. I don't have the Rhizophagus key with me right now, but this last characteristic should help to determine the exact species.

species ID
Unfortunately I do not have a key to all of the species. But the specimen has the middle tibiae with 3 long spines and a large attenuate spine at the apex of tibiae 1. The two partial keys I was able to locate would indicate it is either sayi or bipunctatus. Are these the only two with the large spines on the middle tibiae?

It's Rhizophagus sayi
I don't know what you mean about a serrate pronotum. No Rhizophagus have a serrate pronotum as far as I know.

I think you got it
I think you are correct. My photo does not show the two light spots at the base of the elytra but they are there, just faint. I have been catching a lot of these lately in a white pan trap using soapy water and a baffle. Thank you for the ID.

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