FIGURES 1–6. Thremma sardoum Costa 1884, final instar larva. 1 in Discriminatory matrix for the larvae of the European Thremma species (Trichoptera: Thremmatidae)

FIGURES 1–6. Thremma sardoum Costa 1884, final instar larva. 1, head, frontal (a = antenna; small white and black numbers = setal positions). 2, head and pronotum, dorsal (small white and black numbers = setal positions; yellow oval = group of frontoclypeal setae #1–3; c = lateral constriction; p = pronotum). 3, head, ventral (small white number = setal position). 4, detail of pennate ventral head seta # 8. 5, mandibles, ventral (a = apex; c = central section; e = median straight edge; s = semicircular edge; arrow = setal tuft). 6, mesonotum, dorsal (ms = mesonotum; sa1–sa3 = sclerites of setal areas 1–3; dotted oval = small sclerite sometimes separated from sclerite sa2; arrow = incomplete suture in center of sclerite sa3). Scale bars: 0.5 mm (except Figs 4, 5: 0.1 mm).