FIGURE 26 in Structure and phylogenetic significance of the sternum V glands in Trichoptera 2884

FIGURE 26. SEMs of internal structures, all specimens have been treated with KOH. A–D: Arctopsyche grandis (Hydropsychidae) female. A: Overview showing gland reservoir. B: Close-up of gland duct. Note the U-shape (in cross section) of the duct and how the muscle fibres insert on inside curve of the U-shaped duct. C: Close-up of surface of reservoir, note the numerous ductules connecting to the reservoir. The ductules each connect a secretory cell to the reservoir (secretory cells dissolved by KOH treatment). D: Close-up of end apparatus of a single ductule. The end apparatus is part of the ductule cell, but is surrounded by the secretory cell. E: Psychomyia flavida (Psychomyiidae) female. Note how the gland duct connects to the membranous cuticle between sternite IV and V. In the live animal, the gland reservoir is pressed against the inside of the perforated patch. F: Anagapetus debilis (Glossosomatidae) female. Overview showing reservoir and gland duct, in the live animal the reservoir is situated along the body wall, anterially from the gland opening. Dt, gland duct; Go, gland opening; Ip, insertion point; Mf, muscle fibres; Ppi, perforated patch, internal; Rs, gland reservoir; S IV, sternum IV; S V, sternum V. Scale bars: A–C, E = 10 µm, D = 100nm; F = 100 µm.