Drusus chrysotus Rambur, 1842

Vitecek, Simon, Kucinic, Mladen, Olah, Janos, Previsic, Ana, Balint, Miklos, Keresztes, Lujza, Waringer, Johann, Pauls, Steffen U. & Graf, Wolfram, 2015, Description of two new filtering carnivore Drusus species (Limnephilidae, Drusinae) from the Western Balkans, ZooKeys 513, pp. 79-104 : 83-85

Taxon classification Animalia Trichoptera Limnephilidae

Drusus chrysotus Rambur, 1842 Fig. 4

Material examined.

12 males: Austria, Krumbach, Soboth; N46.723, E15.0555; leg. Graf; 20.V.2004; in coll. WG.

Type locality.

France, Rhône-Alpes, Haute-Savoie, Chamonix valley.

Description.

Adults. Habitus: light brown to yellow; sternites and tergites light brown, abdominal tergite VII with distinct saddle; cephalic and thoracic setal areas pale; cephalic and thoracic setation blond, abdominal setation scarce, short, dark; legs fawn, proximally darker; haustellum and intersegmental integument pale, whitish; wings light brown to yellow with dark setae on veins and blond setae on membrane. Male maxillary palp 3-segmented; forewing length 14-16 mm; spur formula 1 –3– 3.

Male genitalia (Fig. 4). Tergite VIII light brown, with short, pale, translucent setae; spinose area in lateral view with distinct dorsal protrusion and dorsomedial caudal protrusion, in dorsal and caudal views tripartite; flanked by membraneous, less sclerotized areas. Segment IX in lateral view ventrally irregular concave distally; dorsally approximately as wide as ventrally in caudal view; with distinct approximately subtriangular, rounded protrusion in dorsal half (best seen in dorsal and ventral views). Superior appendages in lateral view curved obtusely ventrocaudad in proximal third, proximally with distinct dorsocranial protrusion, approximately as long as high, in dorsal view proximally concave medially; medial transverse section oval. Intermediate appendages in lateral view medially protruding caudad, dorsally with long, rough tip; in dorsal view fused into approximately heart-shaped, centrally indented structure; in caudal view ventrally broad with bulbous lateral protrusions, dorsally narrow, fused. Inferior appendages in lateral view conical, short; in ventral and dorsal views blunt, with blunt, short medial protrusion and slight notch; in ventral view with longitudinal groove delimiting medial lobe. Parameres simple with several tines on common base in distal third.

Female depicted by Schmid (1956), Malicky (2004); larva in key presented by Waringer and Graf (2011), Vitecek et al. (in press); pupa described in Bohle (1987).

Distribution.

This species is widely distributed, occuring in and around the Alpine arc (ecoregion 4), the Western and Central Highlands (ecoregions 8 & 9) and was also found in the northern part of the Dinaric Alps (ecoregion 5) (Fig. 11).