Before venturing to the surface, a P. desertorum worker peers out from the nest entrance. [scroll down for additional notes/references]
The integument (outer body covering) of these P. desertorum workers was quite translucent. When back-lit by the sun (as can be seen in some of these images), these ants glowed with the most beautiful orange-red color. In some cases, x-ray-like hints of their internal anatomy could be seen as well.