13 Oecetis struckii Klapálek, 1903, 5th instar larva, left ventrolateral view (a = antenna, e = two cutting edges of the mandible) 14 Oecetis testacea (Curtis, 1834), 5th instar larva, head, frontal view 15 Oecetis furva (Rambur, 1842), 5th instar larva, right propleuron, lateral view (s = long seta on protrochantin) 16 Oecetis notata (Rambur, 1842), 5th instar larva, head and 3rd leg, frontolateral view (f = two long setal fringes on hind tibia) 17 Oecetis furva (Rambur, 1842), 5th instar larva, distal section of right 3rd tarsus and claw (b = basal seta). Scale bars: 0.1 mm.