Army-ant-defense
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Pheidole obtusospinosa
Blunt-spined Big-headed Ant
Pheidole obtusospinosa is a species of big-headed ant in the genus Pheidole, characterized by soldier ants with enlarged, squared heads used for nest defense. The species belongs to the hyperdiverse ant genus Pheidole, which contains over 1,000 species globally. Soldiers of this species have been observed using their modified heads to block nest entrances against intruders, particularly army ants such as Eciton burchelli. The species was described by Pergande in 1896.