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Photo#255071
Ummidia sp. - Ummidia

Ummidia sp. - Ummidia
Southwest Research Station, Cochise County, Arizona, USA
June 16, 2005
Size: 17mm
This spider was extremely aggressive

Ummidia spp.
This is indeed a Trapdoor Spider. It's overall appearance suggests a female of the Genus Ummidia. I believe the signiture "saddle-shaped" depression on the 3rd pair of legs is slightly visible in your shot. This depression is a key characteristic in identifying members of this Genus. Although these spiders are frequently encountered in the Southeastern U.S., their range extends well into Arizona and further south into Mexico and beyond [1]. Here's a link to the Ummidia page here on Bugguide: http://bugguide.net/node/view/6935/bgimage

It is a trapdoor of some sort
It is a trapdoor of some sort however I am not esp familiar with the species native to that area.

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