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Oryzaephilus - grain beetle - Oryzaephilus mercator

Oryzaephilus - grain beetle - Oryzaephilus mercator
San Leandro, Alameda County, California, USA
December 25, 2005
Size: approx 3.5 mm
I found at least 5 of these at the bottom of one of my black oil sunflower seed bird feeders.

There are three species of Oryzaephilus this could be: O. acuminatus, O. mercator, or O. surinamensis. See

Based on the eye/temple length, it doesn't look like O. surinamensis.

Thanks Mike
Moved from Oryzaephilus.

This is
O. mercator.

I agree that this is not O. surinamensis, based on info & images in the link you provided. My guess is O. mercator, as I couldn't find another reference to the presence of O. acuminatus in the United States, other than the single occurrence in Florida 23 years ago. I measured the length-to-width ratio of your photo at 4.0:1, which is in the middle of the overlap (3.9-4.1:1) between mercator and acuminatus.
Incidentally, the dorsal view (Fig. 2) labeled "Oblique view of... Oryzaephilus acuminatus" on this page is the same SEM image as the one labeled O. mercator on this page (both pages are from the U. of Florida site). And the first oblique view (Fig. 3) is labeled "Dorsal view of... O. mercator" but I think it should read "Oblique view of... O. acuminatus"
Image moved to new genus page.

for the guide page, and for trying to sort through the Florida sites with the same images labelled differently! I thought O. mercator most likely too, but it would be better if someone who knows these beetles confirmed.

By the way, I know at least some of the bird seed I get comes from India. It doesn't say so on the bag, but I was told that at the store. I haven't noticed the beetles in new bags of seeds though, only in one of the feeders that has been sitting outside for a long time (not cleaned as often as it should be...).

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