Helicopsyche (Feropsyche) succincta, Johanson, Kjell Arne & Holzenthal, Ralph W., 2004

Johanson, Kjell Arne & Holzenthal, Ralph W., 2004, Thirteen new species and new distribution records of Helicopsyche (Feropsyche) Johanson from Venezuela (Trichoptera: Helicopsychidae), Zootaxa 711, pp. 1-40 : 7-9

Helicopsyche (Feropsyche) succincta , new species

Fig. 15–21 , 89

This new species is very similar to H. flinti from which it can be distinguished by the absence of a single strong process on the posteroventral margin of the gonocoxite, and the less prominent basimesal lobes. It can be separated from other similar species, e.g., H. grenadensis , H. molesta , and H. valligera , by the anteriorly oriented, but slightly pointed anterior lobe of segment IX.

Male. Head: Antennal scape about as long as eye diameter. Maxillary palp segments equally long, each segment nearly as long as eye diameter. Cephalic warts rounded, convex, about 1/2 as long as eye diameter, with golden brown setae. Forewing golden brown, length 3.9–4.1 mm. Sternum VI process ( Fig. 15, 16 ) nearly 1/2 its segment length, covered by microtrichiae on proximal half; nearly straight in lateral view ( Fig. 15 ), oriented posteroventrally; tubular along its length, except wider at apex; apex bearing minute spines ( Fig. 16 ).

Male genitalia ( Fig. 17–21 ). Segment IX, in lateral view ( Fig. 17 ), with anterior lobe hyperboloid, oriented anteriad, present midlaterally; anterodorsal margin nearly straight; anteroventral margin slightly concave; in dorsal view ( Fig. 18 ), with inner margin hyperboloid; in ventral view ( Fig. 19 ), without posterior process; lateral apodeme present as anteriorly oriented undulate line ( Fig. 17 ), fading before reaching anterior margin; submarginal line present; tergal transverse apodeme apparently absent; sternal transverse apodeme absent. Segment X, in lateral view ( Fig. 17 ), oriented posteroventrad, nearly straight along its length; dorsally nearly straight; tapering along its length, apex narrowly rounded; in dorsal view, ( Fig. 18 ), slightly narrowing apically, apex strongly notched; with about 7 pairs of about equally long megasetae in group starting at distal half. Superior appendage ( Fig. 17 ) club­shaped, oriented posteriorly. Primary branch of gonocoxite, in lateral view ( Fig. 17 ), with proximal half about equally broad, strongly widening at distal half, with undulate dorsal margin; apex produced and curving medially; central part of primary branch slightly narrower than height of central part of tergum X ( Fig. 17 ); anterodorsal margin nearly straight, smooth; posteroventral margin weakly undulate; basimesal lobe small, apically rounded in lateral view ( Fig. 17 ), rounded in ventral view ( Fig. 19 ), with nearly straight, parallel median margins; with 4 weak megasetae on dorsal margin; basal plate, in lateral view ( Fig. 17 ), nearly straight, narrow anteriorly; in ventral view ( Fig. 19 ), sharply triangular, apex narrowly rounded. Phallus, in lateral view ( Fig. 20 ), with anterior half nearly straight, smoothly bent ventrad at midlength, dorsal margin undulating; ventral margin angled; anterior 1/4 about 1.5X broader than its central part ( Fig. 20 ); in ventral view ( Fig. 21 ), phallobase absent; endotheca weakly produced; sperm channel divided into long, thick posterior and slender anterior parts; posteroventral part strongly sclerotized.

Holotype male: VENEZUELA: T.F.A. [Territorio Federal Amazonas = Estado Amazonas]: Camp XII, 1950 m, near Pico Phelps, 26.ii.1985, W.E. Steiner, W. Buck, B. Boom, C. Brewer ( NMNH, pinned).

Paratype: same data as holotype, except Camp X, 1690 m, 0°54'N, 60°2'W [sic! is possibly 0°54'N, 66°02'W], 13.ii.1985, W.E. Steiner — 1 male ( NMNH, pinned).

Distribution. Venezuela (Amazonas).

Etymology. The name succincta , from the Latin succinctus, means short, and refers to the short basimesal process of the gonocoxite. The name is to be treated as a noun in apposition.

Figures

FIGURE 89. Map of Venezuela showing distributions of H. auroa (circle), H. woytkowskii (rectangles), and H. succincta (triangles).

FIGURES 15 – 21. Helicopsyche succincta, new species, holotype. 15 — sternum VI process, lateral; 16 — sternum VI process, ventral; 17 — male genitalia, lateral; 18 — male genitalia, dorsal; 19 — male genitalia, ventral; 20 — phallus, lateral; 21 — phallus, ventral.