Atopsyche yanachaga, Rázuri-Gonzales & Holzenthal, 2025

Atopsyche yanachaga sp. nov.

Figs 14 View Figure 14 , 15 View Figure 15

Type material.

Holotype. Peru • 1 ♂; Pasco, Yanachaga-Chemillén NP, Quebrada San Alberto at Refugio El Cedro ; 10.5452°S, 75.3578°W, 2421 m a. s. l.; 07 May 2011; C. Carranza, M. Alvarado, L. Figueroa leg.; light trap; MUSM -ENT-320971 ( MUSM) GoogleMaps . Paratypes. Peru • 1 ♂; same data as the holotype, but 12 Nov. 2010; C. Carranza, J. Peralta leg. ( MUSM) GoogleMaps • 1 ♂; same data as the holotype, but 13 Jun. 2010; E. Rázuri, C. Carranza leg. ( UMSP) GoogleMaps .

Diagnosis.

Atopsyche yanachaga is the second species related to the species traditionally included in the subgenus Dolochorema . It is most similar to A. major Schmid, 1989 ( Bolivia). In lateral view, both species have an inferior appendage slightly longer than high, a low and quadrate segment IX, and relatively narrow, apically rounded parapods. However, certain details differ in these structures. The posteroventral margin of the first segment of the inferior appendage is more pronounced in the new species, whereas in A. major , the posterodorsal margin is more pronounced. Additionally, the second segment of the inferior appendage is longer. Furthermore, in the new species, the anterior margin of segment IX is shorter than the posterior margin, whereas both margins are of equal size in A. major . Finally, the parapods of the new species is slightly bent downwards at the base and have a sinuous dorsal margin, whereas those of A. major are straight, with a sharp point and a rounded indentation on the apical half of the dorsal margin.

Description.

Adult. Forewing length: male ( 9.5 mm, n = 3). Body and wings brown. Forewing with scattered brown and straw-colored setae along major longitudinal veins; wing membrane with brown and straw-colored setae. Wing venation as in Fig. 14 View Figure 14 . Sterna III and IV without glands; sternum V with a pair of long, membranous glands; process on sternum VI slightly longer than its segment, straight, bearing fine setae on its basal half and spine-like setae on its apical half, process on sternum VII very short, subtriangular, bearing spine-like setae.

Male genitalia. Segment IX, in lateral view, quadrangular, posterior margin almost twice the length of the anterior margin, both margins almost straight (Fig. 15 A View Figure 15 ). Parapod, in lateral view, elongate, sausage-shaped, slightly broader mesally and apically, slightly bent ventrad, dorsal surface with a few setae and 5 peg-like setae mesally, apex rounded (Fig. 15 A View Figure 15 ); in dorsal view, elongate, slightly flattened, lateral margin sinuous with acute projections basally and subapically, mesal margin straight, setae on dorsal surface and peg-like setae mesally, apex subacute (Fig. 15 B View Figure 15 ). Filipod long, slender, with setae of different size along length, apex rounded (Fig. 15 A View Figure 15 ). Preanal appendage short, rounded, setose (Fig. 15 A View Figure 15 ). First segment of inferior appendage, in lateral view, quadrangular, ventral margin slightly convex mesally, dorsal margin convex subapically (forming a broad, bilobed process in ventral view), posterior margin rounded, with setae on margins and lateral surface, mesal surface with a group of ~ 8 long, thick spine-like setae basally and three short, spine-like setae mesally (only 2 spine-like setae on paratype) (Fig. 15 A View Figure 15 ); in ventral view, subtriangular, setose, lateral margin convex, mesal margin sinuous (Fig. 15 C View Figure 15 ); second segment of inferior appendage, in lateral view, triangular, with a few minute setae apically, dorsal margin straight, ventral margin convex, apex narrowly rounded (Fig. 15 A View Figure 15 ); in ventral view, thumb-shaped, apex rounded (Fig. 15 C View Figure 15 ). Proctiger, in lateral view, narrow basally, slightly wider apically, membranous, apex truncate (Fig. 15 A View Figure 15 ). Phallic apparatus complex; phallotheca broadly rounded basally, phallic apodeme indiscernible; with ventral process articulating with inferior appendages, narrow, same width throughout its length; ventrolateral branches of phallotheca present, leaf-shaped, as long as posterior half of phallotheca, acute apically; dorsal process of phallotheca absent; posterior section of phallotheca, in lateral view, broad basally, tapering towards apex, directed slightly posteroventrad, apex rounded, capitate (Fig. 15 D View Figure 15 ); in dorsal view, with a shallow notch mesally (Fig. 15 E View Figure 15 ); phallic spine elongate, stout, spine-like structure, with a strong convex curvature near base, then slightly sinuous (Fig. 15 D View Figure 15 ); in dorsal view, apex acute (Fig. 15 E View Figure 15 ).

Distribution.

Peru: Pasco Department.

Etymology.

Atopsyche yanachaga is named after the Yanachaga-Chemillén National Park, where the type locality is situated. Yanachaga means black bump in Quechua, referring to the dark appearance of these mountains during sunsets on sunny days.