FIGURE 19 in Structure and phylogenetic significance of the sternum V glands in Trichoptera 2884

FIGURE 19. SEMs of external structures. A–D: Psychomyiidae. A: Tinodes sigodanus male, female very similar, gland opening and surrounding scaly patch. B–D: Psychomyia flavida female. B: Gland opening, note that it is situated in the membranous area between sternites IV and V, not on sternite V. C: Overview of perforated patch, the very distinctive surface structure of the perforated patch was found only in this species. D: Close-up of same. E–H: Polycentropus cinereus (Polycentropodidae), male and female very similar. E: Male, protuberance on sternum V, note the groove running the length of the protuberance. F: Male, close-up of groove at base of protuberance, note the 'wavy' cuticle along the groove. G: Female, close-up of gland opening, note the slight groove connecting the gland orifice to the groove running the length of the protuberance. H: Female, close-up of apex of protuberance, again note the 'wavy' cuticle along the groove. Go, gland opening. Scale bars: A–C, E, H = 10 µm; D, F, G = 1 µm.