Atopsyche (Dolochorema) huascarani sp. nov.

Figs 8, 9

Type material.

Holotype. Peru • 1 ♂; Ancash, Huascarán NP, Puesto de control Llaca, Laguna Llaca; 9.4375°S, 77.4481°W, 4421 m a. s. l.; 09 May 2016; P. Ancajima and R. Pradel leg.; light trap; MUSM -ENT-320969 (MUSM) . Paratypes. Peru • 1 ♂; same data as the holotype (UMSP) • 1 ♀; same data as the holotype (MUSM) .

Diagnosis.

Atopsyche yanachaga belongs to a group of species traditionally included in the subgenus Dolochorema . These species are characterized by the insertion of the second segment of the inferior appendage, which is positioned on the mesal surface of the first segment and is largely hidden in lateral view. Among these species, A. yanachaga is most similar to A. irregularis (Banks, 1913) (Peru) and A. bispinosa Schmid, 1989 (Bolivia) based on the shape of the parapods in lateral and dorsal view and the inferior appendages in ventral view. All three species have an elongate, narrow parapod, but both A. yanachaga and A. irregularis possess a strongly bent parapod at the base. In contrast, in dorsal view, A. yanachaga has an inflated, rounded parapod apically, while A. irregularis has a straight, narrow one. The first segment of the inferior appendages in these species is mitten-shaped in ventral view, but they can be distinguished by the shape of the second segment. In A. yanachaga, this segment extends beyond the posterior margin of the first segment, while in the other two species, they are small. Notably, A. yanachaga is the only species in this group that lacks the ventrolateral branch of the phallic apparatus.

Description.

Adult. Forewing length: male (12.5 mm, n = 2), female (13.5 mm, n = 1). Body brown (in alcohol), wings pale brown (in alcohol). Wing venation as in Fig. 8. Sterna III and IV without glands; sternum V with a pair of long, membranous glands; processes on sterna VI and VII short, triangular in ventral view, setose.

Male genitalia (Fig. 9). Segment IX, in lateral view, pentagonal, slightly higher than long, with setae on ventral and posterolateral surface (Fig. 9 A). Parapod, in lateral view, elongate, narrow, broader and strongly bent basally, apex rounded, dorsal margin and lateral surface with a few setae mesally (Fig. 9 A); in dorsal view, elongate, lateral margin sinuous, mesal margin convex mesally, setae on dorsal surface at mid-length, apex inflated and rounded (Fig. 9 B). Filipod digitate, as long as parapods, setose, apex rounded (Fig. 9 A). Preanal appendage short, rounded, setose (Fig. 9 A). First segment of inferior appendage, in lateral view, rectangular, ventral margin straight, slightly expanded basally and apically (less produced in the paratype), dorsal margin convex at mid-length, produced mesad into a rugose, triangular projection, bearing single spine-like setae apically (less slender in one of the sides of the paratype), with setae along margins and lateral surface (Fig. 9 A); in ventral view, mitten-shape, setose, lateral margin convex, mesal margin concave (Fig. 9 C); second segment of inferior appendage, in lateral view, elongate, bilobed, dorsal lobe subacute and directed dorsad, ventral lobe triangular, inserted on the mesal surface of the first segment of the inferior appendage (Fig. 9 A); in ventral view, roughly quadrangular, apicolateral corner produced into a rounded lobe, apex truncate (Fig. 9 C). Proctiger, in lateral view, narrow basally, slightly wider apically, with a short carina basolaterally, ventral margin membranous, densely covered with very fine setae, apex truncate (Fig. 9 A). Phallic apparatus simple; phallotheca broadly rounded basally, phallic apodeme indiscernible; with narrow ventral process articulating with inferior appendages, slightly broader at mid-length; ventrolateral branches of phallotheca absent; dorsal process of phallotheca absent; posterior section of phallotheca, in ventral view, broad basally, tapering towards apex, directed posterad, apex subacute (Fig. 9 D); in dorsal view, with a shallow notch mesally (Fig. 9 E); phallic spine, stout, spine-like structure, with a strong convex curvature near base, then slightly sinuous (Fig. 9 D); in dorsal view, apex acute (Fig. 9 E).

Distribution.

Peru: Ancash Department.

Etymology.

The specific epithet refers to the Huascarán National Park, from where the type specimen was collected.