Rhyacophila fasciata Hagen 1859

Valladolid, Maria, Karaouzas, Ioannis, Ibrahimi, Halil, Arauzo, Mercedes, Stamenković, Valentina Slavevska, Dorda, Beatriz A., Hinić, Jelena, Bilalli, Astrit, Musliu, Milaim & Rey, Isabel, 2022, The Rhyacophila fasciata Group in Europe: Rhyacophila macedonica Karaouzas Valladolid & Ibrahimi (n. sp.) from Greece, Kosovo, Republic of North Macedonia and Serbia (Trichoptera: Rhyacophilidae), Zootaxa 5125 (2), pp. 101-130 : 106-107

Rhyacophila fasciata Hagen 1859

Description of the imago. A complete description of the species is included in the publication by Valladolid et al. (2021). Here we describe small differences from the original description of R. fasciata found in male and female specimens from Kosovo.

Male body length: 8.06–10.68 mm ( = 9.44, n = 22); each forewing: 10.11–12.52 ( = 11.32, n = 22); each hind wing: 8.94–10.91 mm ( = 9.87, n =22).

Female body length: 8.92–12.99 mm ( = 10.75, n = 7); each forewing: 10.57–12.67 mm ( = 11.98, n = 7); each hind wing: 9.21–11.31 mm ( = 10.42, n = 7).

Colour: Specimens preserved in ethanol reddish brown dorsally, yellowish ventrally, spurs reddish, setae golden brown, females generally darker than males; small black or dark brown spots in dorsal area; in lateral view, some specimens with large black spots marking border between dorsal and ventral areas. Forewings ( Figs 8a, b ) dark with small pale spots, two short transversal dark bands (fasciae) in Kosovo specimens ( Fig. 8b ), pale in preserved specimens, darker in females, hind wings pale ( Fig. 8c ). In specimens from Kosovo ( Fig. 8b ), forewings each with dark thick pterostigma area on leading edge between apices of subcostal (Sc) and first radial (R 1) or second radial (R 2) veins, each hind wing with pale thick pterostigma area between apices of subcostal (Sc) and second radial (R 2) veins, but not reaching second radial veins in some specimens; each forewing hyaline in irregular or triangular zone connecting medial (M) and medio-cubital (m-cu) veins and in distal area (arculus) of second cubital vein (Cu 2); in each hind wing ( Fig. 8c ) proximal segment of medial veins and connection area (M 1-4) not conspicuous, second cubital (Cu 2) veins not conspicuous proximally, proximal portion of cubital vein (Cu) and distal portions of first cubital vein (Cu 1a1b) thicker.

Male genitalia ( Fig. 15 ): Apical segment of each inferior appendage in lateral view ( Fig. 15a ; Valladolid et al. 2021, fig. 12A) with basal and distal edges diverging, dorsal and ventral edges diverging, posterior edge slightly concave dorsally and slightly convex ventrally, ventral edge slightly concave; apicodorsal vertex slightly angular (~117°), apicoventral angle rounded, projecting as thick lobe tapering to apex.

Parameres in ventral view curved posteromesad in apical half ( Fig. 15c ; Valladolid et al. 2021, fig. 12BV). In lateral view ( Fig. 15d ; Valladolid et al. 2021, fig. 12BL) each constricted at short distance beyond base, dilated at middle (~38% as thick as length of paramere), with almost parallel posterodorsal and anteroventral margins in central area (S-shape), two files of long and thick spines on midventral margin, pointing outward (some Kosovo specimens with two files of sparse spines); midlateral surface covered by sparse fine spicules or setae, from middle anteroventral to posterodorsal edges and covering most of apex, absent in middle anteroventral and dorsal edges.

Aedeagus (phallicata) in lateral view ( Valladolid et al. 2021, fig. 12 CL) with anterodorsal margin concave and posterior corner of this concavity hooked anterad, posterior edge of aedeagus straight, apicoventral tip projected posterodorsad, subapically concave dorsally and convex ventrally.Ventral lobe of aedeagus triangular in ventral view ( Fig. 15c ; Valladolid et al. 2021, fig. 12BV), lateral edges slightly convex; lateroventral lobes of phallus straight, posterior edges strongly convex, subapicolateral margins slightly convex ( Valladolid et al. 2021, fig. 12CD).

Apicodorsal lobe of segment IX slightly dilated subapicolaterally, almost round in dorsal view ( Fig. 15b ; Valladolid et al. 2021, fig. 12DD), with apicomesal excision in some specimens; preanal appendages round, shorter than apicodorsal lobe. In ventral view ( Valladolid et al. 2021, fig. 12DV), apical band V-shaped, nearly as wide as long, non-sclerotized inside area with posteromesal excision, posterior edges rounded, anal sclerites triangular.

Female genitalia ( Fig. 17 ): In lateral view ( Fig. 17L , Valladolid et al. 2021, figs 13La; 13Lb-1, -2, -3), posterodorsal margin of segment VIII valves on each side irregular (in Kosovo specimens concave), with subdorsal projection, convex on ventral edge, posterolateral margin irregular, with 1 or 2 posterior projections, ventral projection more conspicuous, in some specimens slightly indented posteriorly, in Kosovo specimens only one ventral projection, rounded apically.

In dorsal view ( Fig. 17D ; Valladolid et al. 2021, fig. 13Da), with indentation between segment VIII valves, and rounded apical and subapical corners, delimiting oval space, small projection in apical corner in some specimens.

In ventral view ( Fig. 17V ; Valladolid et al. 2021, fig. 13V) segment VIII valves forming two elongate sclerites, narrowly separate basally, basal 1/4 of mesal edges parallel, distal 3/4 of mesal edges irregular, slightly concave, diverging; intersegmental membrane with pair of dark, ovoid or slightly elongate sclerites, ovoid in Kosovo specimens.

Figures

FIGURES 8, 9. Wings of Rhyacophila fasciata Hagen 1859 and Rhyacophila macedonica Karaouzas, Valladolid & Ibrahimi (n. sp.). 8a, forewing of R. fasciata, lectotype [Museum of Comparative Zoology of Harvard University, Cambridge, MA, USA (MCZH), with permission]; 8b, forewing of R. fasciata male from Kosovo; 8c, hind wing of R. fasciata male from Kosovo. 9a, 9b, forewings of R. macedonica males from Kosovo; 9c, hind wing of R. macedonica male from Kosovo. Major veins: C = costa, Sc = subcosta, R1–R 5 = radius, M1–M4 = media, Cu1–Cu2 = cubitus, A1–A3 = anal, m-cu = crossvein between medial and cubital veins (from Holzenthal et al. 2007). Scale bars: 2 mm.

FIGURES 14–17. Males and females of Rhyacophila macedonica Karaouzas, Valladolid & Ibrahimi (n. sp.) and Rhyacophila fasciata Hagen 1859 from Kosovo. 14, male of R. macedonica: 14a, 2nd segment of left inferior appendage, left lateral; 14b, apicodorsal lobe of segment IX and preanal appendages, dorsal; 14c, parameres and ventral lobe of aedeagus (phallicata), ventral; 14d, left paramere, left lateral. 15, male of R. fasciata: 15a, 2nd segment of left inferior appendage, left lateral; 15b, apicodorsal lobe of segment IX and preanal appendages, dorsal; 15c, parameres and ventral lobe of aedeagus (phallicata), ventral; 15d, left paramere, left lateral. 16, female segments VIII–XI of R. macedonica: 16L, left lateral; 16D, dorsal; 16V, ventral. 17, female segments VIII–XI of R. fasciata: 17L, left lateral; 17D, dorsal; 17V, ventral. Scale bars: Figures 14a–c, 15a–c = 0.5 mm, Figures 14d, 15d = 200 µm, Figures 16, 17 = 1 mm.