Pogonomyrmex rugosus - rough harvester ant
A Pogonomyrmex worker shows off her psammophore, the basket of long hairs on the underside of her head used for carrying sand grains. This structure enticed Austrian taxonomist Gustav Mayr to name this genus Pogonomyrmex, or "bearded ant".
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This image was captured with a Canon EOS 20D, using a Canon MP-E 65mm 1-5x macro lens.