Rhyacopsyche tanylobosa, 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 : 19-20

Rhyacopsyche tanylobosa , new species

Fig. 27

The extremely long dorsolateral lobe and inferior appendage distinguishes this species from all other species of Rhyacopsyche . The general form is similar to R. andina , an elongate inferior appendage and dorsolateral lobe, along with the absence of peglike setae on the dorsolateral lobe. In addition to the long length of the dorsolateral lobe and inferior appendage, R. tanylobosa can also be diagnosed by the bifid lobe along the posterior margin of the inferior appendage, the ventral lobe bearing a sclerotized tip.

Adult (male: n=10, female: n=10). Forewing length 2.5–3.5, 3.3 mm (male), 3.0–3.7, 3.4 mm (female). Color of head dark brown, antennae light brown, legs medium brown, wings mottled medium and dark brown. Sternum VII with apicomesal point.

Male genitalia. Abdominal segment IX heavily setose, anterior margin slightly rounded; sternum IX, in lateral view, with posterior margin produced into small rounded process; posterior margin slightly inflated midlaterally; dorsolateral lobe of segment IX elongate, in dorsal view clavate, deeply divided, widely separated, apex truncate, meeting along median line, apex bearing several thin setae. Tergum X partially retracted inside segment IX, articulating with intermediate appendage. Intermediate appendage produced into small slender plate lying mesad of inferior appendage, in ventral view, plate a narrow rod lying in the transverse plane. Inferior appendage elongate, slightly inflated along lateral margin, heavily setose, in lateral view, apex truncate, bearing 1 large peglike seta; ventral margin produced into bifid lobe, the ventral most lobe with slightly sclerotized tip. Phallus base inflated, thin membranous sheath surrounding the middle of the phallus; central tubule terminating in very long basally directed filament; apex of lateral process truncate.

Holotype male: VENEZUELA: Barinas: Parque Nacional Sierra Nevada, Queb. San Juan in Sta. Rosa, 08°27.87’N, 070°50.92’W, 1000 m, 21.iii.1997, Holzenthal ( UMSP 000075084) ( UMSP).

Paratypes: ECUADOR: Napo: Rio Jondachi, 30 km N Tena, 950 m, 10.ix.1990, O S Flint, Jr. — 1 male, 2 females ( NMNH); Pastaza: Puyo, 30.i.1976, Spangler et al. — 1 male ( NMNH); 3 km W, 15.vii.1976, Jeffrey Cohen — 10 males, 20 females ( NMNH); 8.v.1977, #22, P J Spangler & D R Givens — 1 male ( NMNH); 1.5 km S, 14.v.1977, #43, P J Spangler & D R Givens — 1 male, 1 female ( NMNH); 18.v.1977, #56, P J Spangler & D R Givens — 1 male ( NMNH); Pichincha: N. Perucho, 18–19.ix.1977, L E Pena G — 8 males, 2 females ( NMNH); Río Umachaca, For. Sta. Maquipucuna, 5 km E Nanegal, 0°075’N, 78°37’W, 1250 m, 4– 5.ix.1990, O S Flint, Jr. — 6 males, 3 females ( UMSP); Zamora–Chinchipe: 6 km E Zumbi, 980 m, 21.ix.1990, O S Flint, Jr. — 4 males ( NMNH); Río Jamboe, 21 km S Zamora, 1340 m, 22.ix.1990, O S Flint, Jr. — 8 males, 1 female ( NMNH); PERU: Cuzco: Paucartambo to Pilcopata rd., river at Puente Union, 13°04.22’S, 71°34.00’W, 1670 m, 21–23.vi.1993, R Blahnik & M Pescador — 1 male ( NMNH); Paucartambo to Pilcopata rd., Quebrada Quitacalzon at Puente Quitacalzon, 13°01.57’S, 71°29.97’W, 1050 m, 25– 27.vi.1993, R Blahnik & M Pescador — 13 males, 2 females ( NMNH); Paucartambo to Pilcopata rd., streamlet 50 m E Quitacalzon, 13°01.57’S, 71°29.97’W, 1050 m, 26.vi.1993, R Blahnik & M Pescador — 6 males, 8 females ( UMSP); Madre de Dios: Amazonia Lodge, Toma del Agua (stream), 12°52.22’S, 71°22.56’W, 415 m, 29.vi.1993, R Blahnik & M Pescador — 1 male, 1 female ( NMNH).

Distribution. Ecuador, Peru, Venezuela.

Etymology. Tany, Greek for long; lobos, Greek for a rounded projection, referring to the very long dorsolateral lobe and inferior appendage.

Figures

FIGURE 27. Rhyacopsyche tanylobosa, new species. Male genitalia: A—lateral; B—dorsal; C—ventral; D—phallus, dorsal.