FIGURE 10 in Structure and phylogenetic significance of the sternum V glands in Trichoptera 2884

FIGURE 10. Drawings based on wholemounts. The structures are viewed through the cuticle and anterior is to the left with down being mesal; thus all drawings show the left gland. Muscle fibres are grey and all structures are drawn as if they were transparent. Transparency of cuticle is not indicated. A–E: Glossosomatidae. A and B: Anagapetus debilis female and male, respectively. C and D: Agapetus walkeri female and male, respectively. Note the loosely arranged secretory cells in the female, the lack of secretory cells in the male is most likely an artefact as is the missing gland opening muscle in the female. Note that the gland opening muscle in the male inserts on the large involuted sac and originates at the front edge of sternum VI. Thicker black lines in the male indicate places where the cuticle bends away from the surface of the animal. E: Protoptila cana male, the female is similar. S V, sternum V; S VI, sternum VI; Go, gland opening; Ip, insertion point for muscle; Is, involuted sac; Op, origin point for muscle; Rs, gland reservoir; Sc, secretory cells; L-t, Lepidoptera-type opening muscle.