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Bruchinae - Zabrotes

Bruchinae - Zabrotes
West of fort Apache, Navajo County, Arizona, USA
September 1, 2009
Size: 2 mm
On Milkweed

Images of this individual: tag all
Bruchinae - Zabrotes Bruchinae - Zabrotes

Moved from Zabrotes spectabilis.

See comment "Maybe Zabrotes cruciger male" below.

Moved from Zabrotes.

Zabrotes spectabilis
This is Zabrotes spectabilis. The combination of white on the suture and the white spots on the sides of the pronotum are characteristic for this species.

Maybe Zabrotes cruciger male
From Kingsolver 2004 (1), Z. spectabilis and the male of Z. cruciger have similar markings. Both have white markings on their lateral pronotum. Both also have sutural stripes the on pronotum and elytra, which the female of Z. cruciger lacks. They are most ready distinguished by their great difference in size. Z. spectabilis is only 0.7-1.6 mm, while Z. cruciger comes it at a whopping 2.1-2.9 mm. The subject specimen is reported to be 2 mm. This is more consistent with Z. cruciger, but is just a round number.

I have posted an image series on a beetle which, at 2.76 mm (with head retracted), is more clearly a Z. cruciger male showing these features:

The remarks there go into more detail. The same uncertainty applies to this Zabrotes sp. that was thought to be Z. spectabilis.

thanks, Rob -- makes good sense

Moved from ID Request.

Genus is Zabrotes

Yes, I was just moving it
but I'm not sure if it is Z. cruciger?

cruciger is a fairly good match
a pygidium closeup would help a lot

There are about seven similar species.

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