Rhyacophila denticulata, McLachlan, 1879

Rhyacophila denticulata

MALE

Genitalia ( Fig. 9 View FIGURES 9–10 , 13 View FIGURES 13–15 ): 2nd segment of each inferior appendage ( Fig. 9A View FIGURES 9–10 , 13a View FIGURES 13–15 ) with posterior edge slightly concave in central area, ventral edge straight, 2 times longer that dorsal edge; apicodorsal vertex of 2nd segment ~ 135° and round, apicoventral angle ~ 50°, projecting as thick lobe tapered to round apex.

Parameres in ventral view curved posteromesad in distal half ( Fig. 9 View FIGURES 9–10 BV, p). In lateral view ( Figs 9 View FIGURES 9–10 BL, 13d) each constricted at short distance beyond base, dilated at middle, with dorsal and ventral margins rounded and almost parallel; two rows of thick spines on midventral margin, pointing outward; midlateral surface with spicules or setae, from middle posteroventral to posterodorsal edges, bigger from ventral to middle area, smaller from middle to dorsal area. Aedeagus (phallicata) in lateral view ( Fig. 9 View FIGURES 9–10 CL) with anterodorsal margin and posterior corner of dorsal concavity hooked anterad, apical edge of aedeagus straight or slightly convex; ventral lobe of aedeagus in ventral view almost circular, with pointed apex ( Fig. 9 View FIGURES 9–10 BV, vl), in lateral view vertical edge straight, posteroventral angle round, almost 90º ( Fig. 9 View FIGURES 9–10 CL). In dorsal view posterior edges of lateroventral lobes of phallus apically triangular, apicolateral margins convex ( Fig. 9 View FIGURES 9–10 CD, lvl).

Apicodorsal lobe of segment IX in dorsal view oval ( Figs 9 View FIGURES 9–10 DD, al; 13b), with small apicomesal excision; preanal appendages ( Fig. 9 View FIGURES 9–10 DD, pa) elongate rectangular, 4/5 as long as apicodorsal lobe, round subapically and posterior edges triangular. In ventral view, apical band U-shaped ( Fig. 9 View FIGURES 9–10 DV, ab), longer than wide, its posterior arms parallel and round apically, its non-sclerotized mesal area U-shaped ( Fig. 9 View FIGURES 9–10 DV, va), anal sclerites triangular, posterior edges concave ( Fig. 9 View FIGURES 9–10 DV, as).