Helicopsyche peruana Banks

Johanson, Kjell Arne, 2003, Redescription of Helicopsyche peruana Banks, 1920 (Trichoptera, Helicopsychidae), Zootaxa 266, pp. 1-4 : 1-3

Helicopsyche peruana Banks

( Figs 1­6 )

Helicopsyche peruana Banks, 1920: 349 .

Material examined

Male holotype: Peru: Natucana [is probably Matucana], 7788 ft., 14.vi. [no year] [H.S.Parish] (in Museum of Comparative Zoology, pinned).

Diagnosis

The genitalia of Helicopsyche peruana are similar to those of Helicopsyche merida Botosaneanu & Flint, 1982 , Helicopsyche maculisternum Botosaneanu, 1993 , and Helicopsyche breviterga Flint, 1991 , in the strongly produced setal bases along the dorsal margin of the gonocoxite. Helicopsyche peruana can be easily separated from H. breviterga and H. maculisternum by the minute sternal process of abdominal segment VI. It differs from H. merida in the greater number of megasetae on the Xth tergum, and in dorsal view by the more slender Xth tergite apex. In addition, the basimesal lobe of H. peruana is more rounded than in both H. merida and H. maculisternum , and more developed than in H. breviterga .

Description

Male. Head: antenna with scape as long as eye diameter. Maxillary palps with distal joint slightly longer than proximal joint. Fore leg anterior spur about 4x longer than posterior spur. Wing venation unknown. VIth sternal process ( Fig. 1 ) minute, triangular, covered by microtrichiae. Genitalia ( Figs 2­6 ): segment IX, in lateral view ( Fig. 2 ), with anterior lobe triangular, oriented anteriad, anterodorsal margin slightly convex; anteroventral margin broadly and shallowly concave; in dorsal view ( Fig. 3 ), with inner margin ovoid; in ventral view ( Fig. 4 ), with sub­straight, undulate posterior margin; lateral apodeme well developed, medially divided, anterior margin ending immediately below anterior lobe apex; tergal transverse apodeme absent; sternal transverse apodeme weak. Segment X, in lateral view ( Fig. 2 ), oriented posteroventrad, sub­straight; dorsally slightly produced proximally; dorsal and ventral margins sub­parallel along their lengths, apex tapering dorsally; in dorsal view ( Fig. 3 ), slightly narrowing along its length, apical part weakly notched; with about 14 megasetae in longitudinal row starting on distal half of segment, the posterior­most megaseta somewhat shorter than the others. Superior appendage ( Fig. 2 ) tubular, oriented dorsolaterad. Primary branch of gonocoxite, in lateral view ( Fig. 2 ), generally triangular, with strongly undulate dorsal margin due to extended setal bases; apex produced posteriorly, rounded; central part of primary branch about 2x as broad as height of central part of Xth tergum ( Fig. 2 ); anterodorsal margin slightly sigmoid, smooth; posteroventral margin with small undulations associated with setal bases. Basimesal lobe of gonocoxite hidden by primary branch in lateral view ( Fig. 2 ), with megasetae oriented dorsad; large, triangular in ventral view ( Fig. 4 ), with sub­straight median margins, smooth; with about 11 megasetae on dorsal surface. Basal plate, in lateral view ( Fig. 2 ), sub­straight, anterodorsal part slightly produced; in ventral view ( Fig. 4 ) sharply triangular, apex pointed. Phallus ( Figs 5­6 ), in lateral view ( Fig. 5 ), slightly curved along its length, dorsal margin slightly convex; ventral margin strongly concave; anterior 1/4 2x as broad as central part ( Fig. 5 ); in ventral view ( Fig. 6 ); endotheca with long, strongly erect dorsal lobe; sperm duct undivided; posteroventrally strongly sclerotized.

Figures

FIGURES 1 ­ 6. Helicopsyche peruana Banks, 1920 (male holotype). 1, VIth sternal process, ventral view; 2, Genitalia, lateral view; 3, Genitalia, dorsal view; 4, Genitalia, ventral view; 5, Phallus, lateral view; 6, Phallus, ventral view.