Pheidole obtusospinosa

    

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When I first found these ants, I couldn't get the supermajors to come out of the nest, not even for cookie baits. When I dropped another ant near the entrance, such as this hapless Pogonomyrmex rugosus, the majors and supermajors swarmed out to attack.
When I first found these ants, I couldn't get the supermajors to come out of the nest, not even for cookie baits. When I dropped another ant near the entrance, such as this hapless Pogonomyrmex rugosus, the majors and supermajors swarmed out to attack.
Pheidole obtusospinosa nest at the base of a mesquite tree, with my fingers on the left side of the picture for scale. The yellow arrows mark nest entrances. Their nests seem to be quite diffuse, with messy mounds like this around the base of vegetation, connected by foraging trails.
Pheidole obtusospinosa nest at the base of a mesquite tree, with my fingers on the left side of the picture for scale. The yellow arrows mark nest entrances. Their nests seem to be quite diffuse, with messy mounds like this around the base of vegetation, connected by foraging trails.
Pheidole obtusospinosa major, held between my fingers for scale. These ants have an unpleasant odor associated with them - you can smell them on your fingers for quite awhile after handling them.
Pheidole obtusospinosa major, held between my fingers for scale. These ants have an unpleasant odor associated with them - you can smell them on your fingers for quite awhile after handling them.
Pheidole obtusospinosa major, held between my fingers - closer view.
Pheidole obtusospinosa major, held between my fingers - closer view.
Pheidole obtusospinosa minor workers with termite prey. Ants
Pheidole obtusospinosa minor workers with termite prey. Ants
Pheidole obtusospinosa supermajor (top of photo), major (bottom of photo) and minor (right hand side of photo) workers.
Pheidole obtusospinosa supermajor (top of photo), major (bottom of photo) and minor (right hand side of photo) workers.
Pheidole obtusospinosa major and minor workers. The minors have 'spread eagled' a Myrmecocystus mimicus worker prior to dismembering her.
Pheidole obtusospinosa major and minor workers. The minors have 'spread eagled' a Myrmecocystus mimicus worker prior to dismembering her.
Pheidole obtusospinosa minor workers 'spread-eagling' an Ephebomyrmex worker.
Pheidole obtusospinosa minor workers 'spread-eagling' an Ephebomyrmex worker.
Pheidole obtusospinosa minor worker with dead Pogonomyrmex rugosus worker. Pheidole obtusospinosa is very hard on other ants.
Pheidole obtusospinosa minor worker with dead Pogonomyrmex rugosus worker. Pheidole obtusospinosa is very hard on other ants.