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Utah-bean weevil - Bruchidius terrenus

Utah-bean weevil - Bruchidius terrenus
Salt Lake City (N40°46.727'W111°52.629'ele4609'), Salt Lake County, Utah, USA
August 23, 2009
Size: 3mm

Images of this individual: tag all
Utah-bean weevil - Bruchidius terrenus Utah-bean weevil - Bruchidius terrenus Utah-bean weevil - Bruchidius terrenus Utah-bean weevil - Bruchidius terrenus

ID confirmed by Rick Hoebeke:
"I concur that the images taken by Kerry Matz look like that of Bruchidius terrenus. It is definitely not Mimosestes acaciestes! Although I am unable to see all the details that would definitively identify it as B. terrenus, those that are visible, including the coloration pattern, are consistent with B. terrenus. I would love to see some specimens. The fact that Mimosa julibrissin is present in Salt Lake City makes me even more suspect. Chances are the winter conditions may not be suitable for this Asian immigrant to sustain any thriving populations on mimosa; then again who knows! Definitely an examination of old or even shed seed pods should provide evidence of seed predation by this mimosa specialist."

Moved from Mimosestes acaciestes.

Moved tentatively; i think i figured it out finally...
if so, might be a state record; i'll ask around

Moved from Acanthoscelidina.


any mimosa/silk trees (Albizia julibrissin) around?
i'm now suspecting Bruchidius terrenus, a recent invader --see(1) (i wouldn't be surprised for it to show up in your area)

Within eye sight,
what appears to be a mimosa is present (been around for many years). Should be able to confirm when things green up. Collected a number of pods to examine and will set some aside to see if anything pops out.

wonderful --thanks, Kerry!
looking forward to the results

Albizia julibrissin is the tree in question. Have not noticed any exit holes in the pods or have found any beetles in the litter/soil under the tree. Winters might be to cold here.

thanks; looks like the B. terrenus hypothesis is gaining support
i'll poll the expert community )))))

a nice series of what looks like an Acanthoscelides to me
adding a plain dorsal view & a pygidium closeup would help a lot

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