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).

FEMALE

Genitalia ( Figs 10 View FIGURES 9–10 , 16 View FIGURES 16–18 ): In lateral view ( Figs 10L View FIGURES 9–10 , 16L View FIGURES 16–18 ), posterior margin of segment VIII valves on each side with a dorsolateral and dorsoventral projections, posterior margin irregular, strongly concave. In dorsal view ( Figs 10D View FIGURES 9–10 , 16D View FIGURES 16–18 ), with indentation between segment VIII valves nearly enclosed by pair of dorsolateral semicircular thick projections, with rounded apical and angled subapical corners, delimiting circular space. In ventral view ( Figs 10V View FIGURES 9–10 , 16V View FIGURES 16–18 ) segment VIII valves forming two elongate sclerites, convex edges, diverging and separated basally; intersegmental membrane with pair of dark, ovoid big elongate sclerites, occupying most of the central space, pointed posteriorly and round anteriorly.