Rhyacopsyche

Wasmund, Anne M. & Holzenthal, Ralph W., 2007, A revision of the Neotropical caddisfly genus Rhyacopsyche, with the description of 13 new species (Trichoptera: Hydroptilidae), Zootaxa 1634, pp. 1-59 : 13-14

Rhyacopsyche hasta, new species

Fig. 16

This species possesses a cluster of long, light ventrally directed setae among several peglike setae on the dorsolateral lobe, as does R. benwa . A combination of the angulate anterior margin of segment IX and the broad, spatulate inferior appendage, bearing several dark peglike setae distinguishes this species among Rhyacopsyche .

Adult (male: n=1). Forewing length 2.9 mm. Color of head dark brown, antennae cream, legs medium brown, wings mottled light and dark brown. Sternum VII with apicomesal point.

Male genitalia. Abdominal segment IX sparsely setose, anterior margin angulate; sternum IX, in lateral view, with posterior margin produced into small rounded process; posterior margin nearly straight; dorsolateral lobe of segment IX elongate, in dorsal view narrowed, shallowly divided, nearly meeting dorsally, thin dorsal bar lying in the transverse plane, apex bearing several short, dark, peglike setae and group of long, light, ventrally directed spines. Tergum X completely retracted inside segment IX, articulating with intermediate appendage. Intermediate appendage produced into small slender plate lying mesad of inferior appendage, in ventral view, plate sagittate. Inferior appendage elongate, heavily setose, broadly spatulate, apex bearing several peglike setae; ventral margin undulate. Phallus linear, thin membranous sheath surrounding apex; central tubule terminating in a very long, basally directed filament; apex of lateral process truncate.

Holotype male: PERU: Cuzco: Paucartambo to Pilcopata rd., streamlet 50 m E Quiacalzón, 13°01.57’ S, 71°29.97’ W, 1050 m, 26.vi.1993, R Blahnik & M Pescador ( UMSP 000115099) ( MHNJP). Distribution. Peru.

Etymology. The Latin word for spear, referring to the group of long, pointed spines occurring on the dorsolateral lobes of the segment IX.

Figures

FIGURE 16. Rhyacopsyche hasta, new species. Male genitalia: A—lateral; B—dorsal; C—ventral; D—phallus, dorsal.