Rhyacophila tsurakiana Malicky 1984b

Waringer, Johann, Karaouzas, Ioannis & Malicky, Hans, 2018, The larvae of Rhyacophila tsurakiana Malicky 1984, Rhyacophila gudrunae Malicky 1972, and Rhyacophila biegelmeieri Malicky 1984, including an update for the larval key to the Greek species of genus Rhyacophila Stephens 1836 (Rhyacophilidae, Trichoptera), Zootaxa 4508 (1), pp. 85-100 : 87

Description of the final instar larva of Rhyacophila tsurakiana Malicky 1984b

Biometry. Body length 17.2 mm, head width 0.99 mm (n = 1). All morphological characters identical to those of R. gudrunae except as noted below.

Head. Head capsule orange, with brown muscle attachment spots ( Figs 13–14 , 16 ). Anterior margin of frontoclypeus and adjacent areas of parietalia black ( Fig. 13 ).

Thorax. Pronotal sclerites orange, with muscle attachment patterns and coloration less contrasting and less obvious than in R. gudrunae . Only posterior margins thickened and darkly striped, lateral borders orange and crenulated, anterolateral pronotal notch orange, not dark. Anterior borders of pronotal sclerites with dense fringe of very short, curved, fine, yellow setae ( Fig. 15 ). Prosternum inconspicuous. Pleura of meso- and metathoraces without gills ( Fig. 16 ).

Abdomen. Abdominal segments without gills. Posterior border of abdominal dorsum IX trapezoidal ( Figs 17 , 34 ). Anal prolegs without sword processes and without ventral basal hooks; anal claws without ventral teeth ( Figs 18, 19 ).

Figures

FIGURES 11–15. Figures 11–12. Rhyacophila gudrunae Malicky 1972, 5th instar larva. 11, abdominal segments IX, X and anal proleg, right lateral (ac = anal claw; bd = distal ‘b’ sclerite; bp = proximal ‘b’ sclerite; bv = ventral ‘b’ sclerite; c = ‘c’ sclerite; h = proximal hook of sclerite ‘b’; small numbers refer to setal positions; arrow = teeth on anal claw); 12, abdominal segments IX, X and anal proleg, dorsal. Figures 13–15. Rhyacophila tsurakiana Malicky 1984, 5th instar larva. 13, head, dorsal; 14, head, ventral; 15, prothorax, right lateral. Scale bars: 0.5 mm.

FIGURES 16–20. FIGURES 16–19. Rhyacophila tsurakiana Malicky 1984, 5th instar larva. 16, head and thorax, right lateral; 17, abdominal segments IX and X, dorsal; 18, abdominal segments VIII–X and anal proleg, right lateral; 19, abdominal segments IX–X and anal proleg, right ventrolateral. Figure 20. Rhyacophila biegelmeieri Malicky 1984, 5th instar larva, head and pronotum, right lateral. Scale bars: 0.5 mm.

FIGURES 33–34. Outline of dorsal sclerite on abdominal segment IX of 5th instar larvae (black dots refer to insertions of posterior edge setae; arrows= outermost setae). 33, Rhyacophila obtusa Klapálek 1894; 34, Rhyacophila tsurakiana Malicky 1984. Scale bars: 0.5 mm.