Comparison of the frontal gland development between soldiers and imagoes.

Footnote: Size (small, medium, large) refers to relative size compared to members of the same caste in other species. The data about frontal gland size in soldiers are adapted from [7] or are based on unpublished observations by Šobotník & Bourguignon. The gland size in soldiers refers to minor soldiers in soldier-dimorphic species of Rhinotermitinae.