Rhyacopsyche patula, Thomson & Ríos-Touma & Holzenthal, 2025

Rhyacopsyche patula sp. nov.

Fig. 4 View Figure 4

Type material.

Holotype: Ecuador • ♂; Pastaza, small stream, ca 3.8 km (rd) SE Chuwitayo ; 01.92251°S, 077.79459°W; el. 703 m; 20 September 2021; Ríos, Holzenthal, Frandsen, Errigo, Amigo leg.; in alcohol; UMSP 000280912 View Materials ; MECN GoogleMaps .

Diagnosis.

Rhyacopsyche patula , new species, is most similar to R. holzenthali Harris & Armitage, 2019 . Both species are lacking the deep division often observed in the posterior margin of the dorsolateral lobe when viewed dorsally, and the general appearance of the inferior appendage is very similar between the two when viewed laterally. However, R. patula is lacking both the small emargination and the peg-like setae present on the dorsolateral lobe of R. holzenthali . In addition, the inferior appendage of R. holzenthali is more slender than that of R. patula .

Description.

Adult (male: n = 1). Forewing length 2.9 mm (male). Head unmodified, with 3 ocelli; antennae unmodified. Tibial spurs 1, 3, 4. Specimen brown in alcohol. Sternum VII with short mesoventral point. Male genitalia. Abdominal segment IX setose, anterolateral margin rounded, posterolateral margin irregular and with ventral projection; dorsolateral lobe of segment IX setose, rounded, in dorsal view broad and truncate (Fig. 4 A, B View Figure 4 ). Tergum X membranous, partially retracted inside segment IX, fused with intermediate appendage (Fig. 4 A, B View Figure 4 ). Intermediate appendage membranous, fused mesally, with lightly sclerotized sections laterally and ventrally (Fig. 4 A, C View Figure 4 ). Inferior appendage setose, dorsal margin enlarged mesally, ventral margin sinuate; apex bearing prominent, peg-like seta (Fig. 4 A, C View Figure 4 ). Phallus basally tubular, elongate, apex membranous; central tubule with slight hooked apex in dorsal view; lateral process pointed (Fig. 4 D View Figure 4 ).

Etymology.

Patulus, Latin for “ spread out, broad, ” referring to the broad dorsolateral lobe of abdominal segment IX, without division when viewed dorsally.

Distribution.

Ecuador (Table 1 View Table 1 ).