Anisogamus difformis (McLachlan 1867)

Graf, Wolfram, Vitecek, Simon, Previšić, Ana & Malicky, Hans, 2015, New species of Limnephilidae (Insecta: Trichoptera) from Europe: Alps and Pyrenees as harbours of unknown biodiversity, Zootaxa 3911 (3), pp. 381-395 : 387

Anisogamus difformis (McLachlan 1867)

Figs. 4 E–H.

Material examined. 7 males; Austria, Carinthia, Saualpe, Ladinger Hütte, 28–29.vi.2012, leg. W. Graf. 7 males, 3 females: Italy, Torino, Fondo, Gias del Prete (45°31'13.37''N 007°39'40.59''E) 12.vii.2012, leg. G. Vinçon. 1 male: France, Provence Alpes-Côte d’Azur (44°20'16.4''N 006°47'27.9''E) 29.vii.2012, leg. W. Graf. 4 males: Austria, Carinthia, Saualpe, Offener Hütte, 30.vi.2006, leg. W. Graf. 9 males: Austria, Carinthia, Saualpe, Ladinger Alm, 29.vi.2012, leg. W. Graf. 27 males: Austria, Carinthia, Saualpe, Ladinger Hütte, 15.vii.2006, leg. W. Graf.

Type locality. Austria, Carinthia, Saualpe.

Description. General appearance ( Fig. 3 B) yellow to fawn, sclerites yellow to fawn; cephalic and thoracic setal areas pale cream-coloured; cephalic, thoracic and abdominal setation yellow; legs yellow to fawn; haustellum and intersegmental integument pale cream-coloured; wings yellow, translucent, with dark veins, setation on veins and membrane yellow. Male maxillary palps each trisegmented. Spur formula 1,3,4.

Male genitalia ( Fig. 4 E–H). Tergite VIII yellow to fawn, with pair of suboval spinate areas separated medially. Abdomen IX in lateral view with dorsal bulge ( Fig. 4 E, arrow). Lateral processes of segment X (“superior appendages”) in lateral view stout dorsal lobes, in dorsal view posteriorly concave, in caudal view suboval, somewhat converging medially. Segment X clearly separated into pair of subtriangular vertical plates on either side of phallocrypt and between its lateral processes in caudal view, each with dorsal end bearing 1 median process (“intermediate appendage”) projecting posterodorsad in lateral view; sclerites of segment X in lateral, dorsal and caudal views each with 2 pointed protuberances on rounded posterior processes, these posterior processes in dorsal view rounded subtriangular. Inferior appendages partially fused with abdominal segment IX, in lateral view slender with acute dorsal tip, this tip in caudal view rounded; in dorsal and caudal views inferior appendages slender, delicate. Aedeagus in lateral view distally bulbous, in dorsal view distal part semimembraneous. Parameres longer than aedeagus, evenly curved dorsad; each with proximal part bulbous, bearing 2–3 ventral tines.

Figures

FIGURE 3. Habitus images and known distributions of Anisogamus species. A, male A. waringeri sp. nov., right lateral; B, male A. difformis, right lateral; C, shorter-winged female of A. waringeri, right lateral; D, map of the known geographical distributions of Anisogamus species. Records of Anisogamus sp. from the Pyrenees are those of Décamps (1967). Anisogamus waringeri sp. nov. was recorded from the Pyrenees by Menéndez & González (2009) as A. difformis (pers. comm. M. A. González).

FIGURE 4. Male genitalia of Anisogamus species. A – D, A. waringeri sp. nov.: A, left lateral; B, phallic apparatus, left lateral (upper) and, dorsal; C, dorsal; and D, caudal. E – H, A. difformis: E, left lateral; F, phallic apparatus, left lateral (upper) and dorsal; G, dorsal; and H, caudal. Abbreviations as in Fig. 1.