Rhyacopsyche turrialbae Flint

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 : 21

Rhyacopsyche turrialbae Flint

Fig. 29

Rhyacopsyche turrialbae Flint, 1971:523 [Type locality: Costa Rica, Cartago, Chitaria; NMNH; male; female].

This species resembles R. mutisi , based on the form of the inferior appendage and the truncate dorsolateral lobe, and is the fourth and final species in the turrialbae group. It is distinguished by the elongate ventral lobes of the inferior appendage, and the thick, twisted intermediate appendage which articulates basally with a membranous plate.

Adult (male n=10, female n=10). Forewing length 3.0–4.0, 3.6 mm (male), 3.7–4.3, 4.0 mm (female). 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 heavily setose, anterior margin slightly rounded; sternum IX, in lateral view, with posterior margin lanceolate; posterior margin slightly inflated midlaterally; dorsolateral lobe of segment IX slightly produced, in dorsal view truncate, shallowly divided, nearly meeting dorsally, apex bearing several short, dark, peglike setae. Tergum X partially retracted inside segment IX, with long basal processes, articulating with intermediate appendage. Intermediate appendage large, sclerotized, produced into narrow, twisted point, articulating basally with membranous plate, in lateral view, plate truncate. Inferior appendage tall, heavily setose, divided into dorsal and ventral lobes, the dorsal lobe with posterior margin produced into fingerlike process, the dorsal margin developed into small setose lobe bearing 1 large peglike seta. Phallus base inflated, thin membranous sheath surrounding apex; central tubule with small apical hook; apex of lateral process truncate.

Material examined. COSTA RICA: Alajuela: unnamed river, Cerro Campana ca. 6 km (air) NW Dos Rios, 10°54’00”N, 085°24’00”W, 640 m, 15–16.iii.1986, Holzenthal & Fasth — 1 male ( UMSP); Cartago: Río Platanillo, 2.2 km E Tayutic, 09°49’12”N, 083°33’00”W, 730 m, 30.i.1986, Holzenthal, Morse & Fasth — 1 male ( UMSP); Quebrada Platanillo, ca. 5 km E Moravia de Chirripó, 09°49’16”N, 083°24’25”W, 1130 m, 6.viii.1987, Holzenthal, Morse & Clausen — 2 males, 6 females ( UMSP); Reserva Tapantí, Quebrada Palmitos & falls, ca. 9 km (road) NW tunnel, 09°43’12”N, 083°46’48”W, 1400 m, 1–2.viii.1990, Holzenthal, Blahnik & Muñoz — 1 male ( UMSP); Quebrada Segunda @ administration building, 09°45’40”N, 083°47’13”W, 1250 m, 9–10.v.1990, Holzenthal & Blahnik — 2 males, 6 females ( UMSP); Puntarenas: Río Guineal, ca 1 km (air) E Finca Helechales, 09°04’34”N, 083°05’31”W, 840 m, 4.viii.1987, Holzenthal, Morse & Clausen — 13 females ( UMSP); Río Singrí, ca 2 km (air) S Finca Helechales, 09°03’25”N, 083°04’55”W, 720 m, 21.ii.1986, Holzenthal, Morse & Fasth — 3 males, 2 females ( UMSP).

Distribution. Costa Rica.

Figures

FIGURE 29. Rhyacopsyche turrialbae Flint. Male genitalia: A—lateral; B—dorsal; C—ventral; D—phallus, dorsal.