Rhyacopsyche patulosa, Wasmund, Anne M. & Holzenthal, Ralph W., 2007

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 : 18

Rhyacopsyche patulosa , new species

Fig. 24

This species resembles R. yatay in the virtual absence of a dorsolateral lobe and presence of a heavily setose inferior appendage. Rhyacopsyche patulosa is diagnosed by the extremely reduced dorsolateral lobe, the lanceolate tergum X, the broad, almost bilobate inferior appendage, and the long, narrow phallus.

Adult (male: n=1, female: n=5). Forewing length 2.9 mm (male), 3.0–3.2, 3.1 mm (female). Color of head dark brown, antennae light brown, legs medium brown, wings mottled light and dark brown. Sternum VII with apicomesal point.

Male genitalia. Abdominal segment IX heavily setose, anterior margin nearly straight, produced anteroventrally; sternum IX, in lateral view, with posterior margin produced into small rounded process; posterior margin nearly straight; dorsolateral lobe of segment IX not evident, in dorsal view segment IX rounded, deeply divided, widely separated. Tergum X elongate, lanceolate. Intermediate appendage produced into small slender plate lying inside segment IX. Inferior appendage tall, divided into dorsal and ventral lobes, with small apicomesal point, heavily setose, medial face of dorsal and ventral lobes bearing several peglike setae. Phallus linear, thin membranous sheath surrounding the middle of the phallus, covered with spicules; central tubule with small apical hook; apex of lateral process lanceolate.

Holotype male: BRAZIL: Rio de Janeiro: Parque Nacional da Serra dos Órgãos, Rio Beija-flor, 22°27’04”S, 043°00’04”W, 1125 m, 27.ii.2002, Holzenthal, Blahnik, Paprocki & Prather ( UMSP 000069469) ( MZUSP).

Paratypes: BRAZIL: Rio de Janeiro: same data as holotype — 3 females ( MZUSP), 2 females ( UMSP).

Distribution. Brazil.

Etymology. The Latin word patulus meaning spread-out, broad, in reference to the inferior appendage.

Figures

FIGURE 24. Rhyacopsyche patulosa, new species. Male genitalia: A—lateral; B—dorsal; C—ventral; D—phallus, dorsal.