The ultrastructure of the abdominal trumpet gland and antennal ascoid and papilla of Chinius junlianensis Leng, 1987 (Diptera: Psychodidae)

Abstract

When viewed with a light microscope, each trumpet gland of Chinius junlianensis appears as 15–20 small trumpet-shaped structures with their narrower proximal ends clustered together on the surface of a tergite. By scanning electron microscopy (SEM), however, the glands appear to be abdominal exosecreting organs with honeycomb-like openings at the inter-tergal junctions 3/4 and 4/5. Although the other ascoids of C. junlianensis are round in cross-section, each of those distal to antennal segment 8 is roughly triangular, with three ridges and three concave surfaces, and has a large oval depression at its base. The basal ridge has three to five rows of denticulations. The antennal papilla is oval, with a comb-like fence of four to five thin pointed processes on each side and a stout central spine.