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A. The descending shafts of Pogonomyrmex badius nests form a helix. B–D. Chambers are constructed outward from the outside of this helix, so that the intersection between chambers and the helical shaft forms an angle between 25 and 70°. The angle may be either right or left of vertical (compare A and B with C and D). E–F. Chambers are initiated at the outside of the helix as small, flat-bottomed niches.
