File:Billen and Al-Khalifa 2015 F1.jpg

Figure 1. Scanning electron micrographs of the pharyngeal glands of Brachyponera sennaarensis workers. A. Frontal view of the head with dissected pharyngeal glands (enlarged in B) shown at the same magnification. B. Ventral view of pharynx (ph) with attached pro-(ProPG) and postpharyngeal glands (PPG). C. Detail of secretory cells (SC) and slender duct cells (DC) of propharyngeal gland. Arrows indicate local widening of duct cells in region where duct cell nucleus occurs.

Billen, J. and M. S. Al-Khalifa. 2015. Morphology and ultrastructure of the pro- and postpharyngeal glands in workers of Brachyponera sennaarensis. Sociobiology. 62:270-275. doi:10.13102/sociobiology.v62i2.270-275