Ultrastructure of the frontal gland in Prorhinotermes simplex (Isoptera: Rhinotermitidae) and quantity of the defensive substance
The frontal gland as a sac-like organ in Prorhinotermes simplex is present only in presoldiers, soldiers, and imagoes, but exists also in nymph-soldier intercastes.The secretory epithelium consists of a single type of secretory cells adhering directly to the cuticular intima.Secretory vacuoles originate in electron dense vesicles, which are transfo