Helicopsyche revelieri, McLachlan, 1884

Waringer, Johann, Malicky, Hans, Živić, Ivana & Vicentini, Heinrich, 2017, The larvae of the European Helicopsyche species (Trichoptera: Helicopsychidae), Zootaxa 4277 (4), pp. 561-572 : 563-565

Description of the final instar larva of Helicopsyche revelieri

Biometry. Body length from 4.5 to 5.1 mm, head width from 0.50 to 0.61 mm (n = 4). All morphological characters identical to those of H. megalochari except as noted below.

Head. Upper surface of head capsule reddish-brown ( Figs. 22, 23 ), ventral surface cream white ( Fig. 24 ). Submentum trapezoidal, posteriorly broadly rounded and without conspicuous central posterior tip ( Fig. 24 ).

Thorax. Pronotum dark brown ( Fig. 25 ). In total, 110–130 setae of varying lengths distributed over anterior two-thirds of each pronotal half. In total, 78–89 setae of varying lengths distributed over anterior two-thirds of each mesonotal half ( Fig. 25 ). Metanotal setation consisting of 5–6 setae in each setal area 1 (sa 1), 1 seta in each sa 2, and 6–9 setae in each sa 3 ( Figs. 25, 26 ). Setose area of coxa with less and shorter setae than in H. megalochari . Propleural anterior process relatively short, with blunt tip ( Fig. 27 ).

Abdomen. Segment VIII with row of 18–22 tubercula per side.

Case. Case diameters ranging from 3.2 x 2.9 mm to 4.4 x 3.5 mm, height 2.0–2.2 mm (n = 4; Figs. 28, 29 ).

Figures

FIGURES 22 – 26. Helicopsyche revelieri McLachlan 1884, final instar larva. 22, Head, dorsal. 23, Head, right lateral. 24, Head, ventral. 25, Thorax, dorsal. 26, Metanotum, dorsal (sa 1 – sa 3: setal areas 1 – 3). Scale bars: 0.1 mm.

FIGURES 27 – 33. Helicopsyche spp., final instar larvae. 27 – 29, Helicopsyche revelieri McLachlan 1884: 27, left foreleg, anterior face; 28, empty case, dorsal; 29, larva in case, ventral. 30 – 33, Helicopsyche bacescui Orghidan & Botosaneanu 1953: 30, head, dorsal (small black numbers: setal positions # 12 – 14 and 17 on left parietal; black circles: additional setae between setal positions # 12 and 17); 31, head, right lateral (small white numbers: setal positions # 12 and 17 on right parietal; white arrows: additional setae between setal positions # 12 and 17); 32, right propleuron, right lateral; 33, head, ventral. Scale bars for Figs. 27, 30 – 33: 0.1 mm; scale bars for Figs. 28 – 29: 1 mm.