FIGURES 50–55 in Discriminatory matrix for the larvae of the European Thremma species (Trichoptera: Thremmatidae)

FIGURES 50–55. Thremma tellae González 1978, final instar larva. 50, ventral protuberance of abdominal segment I, ventral (m = semicircular row of muscle attachment spots; dashed lines = borders of V-shaped membranous area). 51, abdominal segment IX, dorsal. 52, tip of abdomen, right lateral. 53, case, ventral. 54, case, left lateral. 55, case, posterior, showing silken membrane with ovoid foramen. Scale bars: 0.5 mm (except Fig. 55: 0.2 mm).