Drusus muelleri McLachlan, 1868

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 : 90

Taxon classification Animalia Trichoptera Limnephilidae

Drusus muelleri McLachlan, 1868 Fig. 8

Material examined.

1 male: Switzerland, Furkapass; N46.5888, E8.4327; leg. Graf; 21.VII.2006, in coll. WG.

Type locality.

Switzerland, Canton of Uri, Hospental.

Description.

Adults. Habitus dark; sternites and tergites brown; cephalic and thoracic setal areas pale, cephalic and thoracic setation blond, abdominal setation scarce, short, dark; coxa, trochanter, femur brown, tibia and tarsi fawn; haustellum and intersegmental integument pale, whitish; wings brown, smoky, with dark setae on veins and blond setae on membrane. Male maxillary palp 3-segmented; Forewing length 11-13 mm ( Malicky 2004); spur formula 1 –3– 3.

Male genitalia (Fig. 8). Tergite VIII brown, setae absent; spinose area in lateral view convex with caudal ventral lobe, in dorsal view suboval with small medial protrusion; flanked by membraneous, less sclerotized areas. Segment IX in lateral view ventrally slightly concave distally; in caudal view wider dorsally than ventrally; with sharp caudally straight subtriangular protrusion in the dorsal half (best seen in dorsal and ventral views). Superior appendages in lateral view irregular, curved obtusely caudad in proximal quarter, proximally distinctly dilated, distally clavate, longest in anterioposterior axis: approximately 5 times longer than high; in dorsal view the proximal third concave medially; medial transverse section circular. Intermediate appendages in lateral view with long, rounded rough tip; in dorsal view tips separate, approximately parallel, proximally bulbous; in caudal view subtriangular. Inferior appendages in lateral view subtriangular, ventrally irregular, proximally sightly concave dorsally; in ventral and dorsal views broad, with small subtriangular medial protrusion and distinct notch; in ventral view with longitudinal groove delimiting medial lobe; in caudal view broad. Parameres simple, with single dorsal tine 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 unknown.

Distribution.

Regionally in the Western Alps (ecoregion 4) (Fig. 11).