Atopsyche chemillen, Rázuri-Gonzales & Holzenthal, 2025

Atopsyche chemillen sp. nov.

Figs 4 View Figure 4 , 5 View Figure 5

Type material.

Holotype. Peru • 1 ♂; Pasco, small creek in Yanachaga-Chemillén NP buffer zone, San Daniel sector ; 10.4278°S, 75.4732°W, 2134 m a. s. l.; 03 May 2011; C. Carranza, M. Alvarado, L. Figueroa leg.; light trap; MUSM -ENT-320759 ( MUSM) GoogleMaps . Paratypes. Peru • 3 ♂; same data as the holotype, but 04 May 2011 GoogleMaps • 1 ♂; same data as the holotype, but 16 Jun. 2010; E. Rázuri, C. Carranza leg. ( MUSM) GoogleMaps • 1 ♂; same data as the holotype, but 16 Nov. 2010; C. Carranza, J. Peralta leg. ( MUSM) GoogleMaps • 1 ♂ 1 ♀; same data as the holotype, but 24 Aug. 2015; E. Rázuri, L. Figueroa, B. Portuguez leg. ( UMSP) GoogleMaps • 2 ♀; same data as the holotype, but 24 Aug. 2015; E. Rázuri, L. Figueroa, B. Portuguez leg. ( MUSM) GoogleMaps .

Diagnosis.

Atopsyche chemillen is most similar to members of the falina species group of Ross and King (1952). This species group is characterized by the slightly produced posteroventral corner of the first segment of the inferior appendage. From all the members included therein, the new species is most similar to A. falina ( Navás, 1930) ( Argentina), A. mayucapac Schmid, 1989 ( Venezuela), A. neolobosa Flint, 1963 ( Ecuador), and A. yunguensis Rueda Martín, 2006 ( Argentina, Bolivia) based on the presence of a spine-bearing dorsal process on the phallotheca. Atopsyche chemillen is most similar to A. mayucapac based on the straight inferior appendage and the shape of the phallotheca, but differs in the shape of the parapods in lateral view (the dorsal margin of this structure is biconcave in the new species but almost straight in A. mayucapac ) and the shape of segment IX (quadrate in the new species but the dorsal margin is obliterated in A. mayucapac ).

Description.

Adult. Forewing length: male ( 9 mm, n = 1), female ( 11 mm, n = 1). Body pale brown, wings brown. Forewing with scattered dark brown setae and longer straw-colored and brown setae along major longitudinal veins and wing margin. Wing venation as in Fig. 4 View Figure 4 . Tergum IV with elongate, flattened gland, opening on posterolateral margin, lined internally with minute spines; sternum V with a pair of tiny protuberances; process on sternum VI as long as its segment, curved, bearing spine-like setae along its length (the last one is peg-like), process on sternum VII shorter than process on previous segment, digitate, bearing very fine, short setae (only visible at 200 ×).

Male genitalia (Fig. 5 View Figure 5 ). Segment IX, in lateral view, quadrangular, slightly higher than long (Fig. 5 A View Figure 5 ). Parapod, in lateral view, shorter than inferior appendage, same width along its length, with a spine-like lobe subapically on ventral margin, directed posterodorsad, with setae apically, apex concave (Fig. 5 A View Figure 5 ); in dorsal view, short, lateral margin with a spine-like projection subapically, mesal margin straight, with setae apically, apex upturned, concave (Fig. 5 B View Figure 5 ). Filipod digitate, longer than parapods, setose, apex slightly capitate (Fig. 5 A View Figure 5 ). Preanal appendage short, rounded, setose (Fig. 5 A View Figure 5 ). First segment of inferior appendage, in lateral view, long, straight, same width along its length, posteroventral corner slightly produced posterad, with setae on lateral and ventral surfaces (Fig. 5 A View Figure 5 ); in ventral view, slightly C-shaped, setose, lateral margin almost straight, mesal margin slightly concave, posterior margin truncate (Fig. 5 C View Figure 5 ); second segment of inferior appendage, in lateral view, subtriangular, very short, setose, dorsal and ventral margins straight, apex rounded (Fig. 5 A View Figure 5 ); in ventral view, falcate, apex acute (Fig. 5 C View Figure 5 ). Proctiger, in lateral view, broadly widened apically, with truncate apical margin, with a few long setae on its basal half; in dorsal view, tapering apically (Fig. 5 A View Figure 5 ). Phallic apparatus complex; phallotheca broadly rounded basally, phallic apodeme indiscernible; with ventral process articulating with inferior appendages, narrow, tapering towards apex; ventrolateral branches of phallotheca absent; dorsal process of phallotheca present, divided into pair of recurved, rounded lobes, bearing short spines on apical half; posterior section of phallotheca, in lateral view, broad basally, tapering towards apex, directed posterad, apical half covered with short setae, lateral surface with a serrated ridge, apex narrowly rounded (Fig. 5 D View Figure 5 ); in dorsal view, with a deep notch mesally, apex directed laterad (Fig. 5 E View Figure 5 ); phallic spine elongate, stout, with a strong curvature near the base (Fig. 5 D View Figure 5 ); in dorsal view, apex acute (Fig. 5 E View Figure 5 ).

Distribution.

Peru: Pasco Department.

Etymology.

Atopsyche chemillen is named after the Yanachaga-Chemillén National Park, where the type locality is situated. Chemillen means black or burned in Yanesha, referring to the dark appearance of these mountains during sunsets on sunny days.