Comparison of the head widths (H.W.) among worker subcastes in fire ants.

Abstract

<p>Majors are considered the biggest workers, minors are considered the smallest, and mediums are intermediate in size between majors and minors. The heads of a major worker (left; 0.93–1.46 mm H.W.), a medium worker (center; 0.73–0.92 mm H.W.) and a minor worker (right; ≤ 0.72 mm H.W.) are shown.</p