Atopsyche corcuerai, Rázuri-Gonzales & Holzenthal, 2025

Rázuri-Gonzales, Ernesto & Holzenthal, Ralph W., 2025, The genus Atopsyche (Trichoptera, Hydrobiosidae) in Peru, with the description of seven new species, ZooKeys 1263, pp. 441-478 : 441-478

Atopsyche corcuerai sp. nov.

Figs 6 , 7

Type material.

Holotype. Peru • 1 ♂; Cajamarca; ACP Bosque Cachil ; 7.39689°S, 78.7809°W, 2522 m a. s. l.; 21–22 Apr. 2015; J. Peralta, P. Sánchez, M. Rodríguez, E. Sánchez, D. Silva, J. Grados leg.; light trap; MUSM -ENT-320967 ( MUSM) . Paratypes. Peru • 9 ♂ 1 ♀; same data as the holotype ( MUSM) • 2 ♂; same data as the holotype ( UMSP) • 2 ♂; same data as the holotype ( NMNH) • 2 ♂; same data as the holotype ( SMF) .

Diagnosis.

This new species closely resembles Atopsyche cajas Harper & Turcotte, 1985 ( Ecuador), particularly in the position of the second segment of the inferior appendage, which is inserted on the mesal surface of the first segment. However, the two species can easily be separated based on differences in the shape of the parapod, inferior appendage, and phallic apparatus. In the new species, the parapod is narrow and tapering in lateral view, while in A. cajas , the parapod is broader and roughly uniform in width. In dorsal view, the parapod of the A. corcuerai is narrow and truncate apically, whereas in A. cajas , it is wider mesally and rounded apically. The apex of the first segment of the inferior appendages in A. corcuerai is falcate, while in A. cajas , it is broadly rounded. In ventral view, the second segment of the inferior appendages in A. corcuerai is roughly one-third the length of the first segment, while in A. cajas , it is about half the length of the first segment. Additionally, the mesal surface of the first segment of the inferior appendage is produced in A. corcuerai , whereas it is rounded in A. cajas . Finally, the posterior processes of the phallotheca in the new species are longer and narrower than those in A. cajas , and the phallic spine is straight in the new species, but slightly curved in A. cajas .

Description.

Adult. Forewing length: male ( 9 mm, n = 16), female ( 10 mm, n = 1). Body brown (in ethanol), wings pale brown (in ethanol). Wing venation as in Fig. 6 . Sternum III – IV without glands; sternum V with a pair of long, membranous glands; process on sternum VI slightly longer than its segment, slightly curved, bearing fine setae on its basal half and spine-like setae on its apical half, process on sternum VII very short, subtriangular, bearing very fine setae.

Male genitalia (Fig. 7 ). Segment IX, in lateral view, pentagonal, shorter than high, with setae on posterolateral and posteroventral surface (Fig. 7 A ). Parapod, in lateral view, elongate, sausage-shaped, broad mesally, tapering towards apex, directed slightly ventrad, dorsal and mesal surface with a few setae subapically, apex narrowly rounded (Fig. 7 A ); in dorsal view, elongate, lateral margin slightly sinuous, mesal margin almost straight, setae on dorsal surface on apical half, apex truncate (Fig. 7 B ). Filipod digitate, as long as parapods, setose, apex rounded (Fig. 7 A ). Preanal appendage short, rounded, setose (Fig. 7 A ). First segment of inferior appendage, in lateral view, oval, ventral margin convex, dorsal margin slightly convex subapically, posterior margin produced into short, subacute process, with setae along on ventral margin and dorsal surface subapically (Fig. 7 A ); in ventral view, reniform, setose, lateral margin convex, mesal margin concave and slightly membranous with a mesal projection directed posteromesad (this projection is pointed on the right side and presents a slight cleft on the left side) (Fig. 7 C ); second segment of inferior appendage, in lateral view, less than half the length of the first segment, ovate, dorsal and ventral margins slightly constricted mesally, apex subacute (Fig. 7 A ); in ventral view, subtriangular, posterior margin slightly projected posterad, apex narrowly rounded (Fig. 7 C ). Proctiger, in lateral view, narrow basally, wider apically, with a short carina laterodorsally on basal half, covered with minute setae, apex slightly rounded (Fig. 7 A ); in dorsal view, tapering apically, with a slight mesal notch. Phallic apparatus complex; phallotheca broadly rounded basally, phallic apodeme indiscernible; with ventral process articulating with inferior appendages, broad, slightly broader basally; ventrolateral branches of phallotheca present, roughly digitate, approximately 0.66 times as long as posterior half of phallotheca, blunt apically; dorsal process of phallotheca absent; posterior section of phallotheca, in lateral view, broad basally, tapering towards apex, directed posterad, apex narrowly rounded (Fig. 7 D ); in dorsal view, with a deep notch mesally (Fig. 7 E ); phallic spine elongate, stout, spine-like structure, without basal curvature, straight (Fig. 7 D ); in dorsal view, slightly pointed apically (Fig. 7 E ).

Distribution.

Peru: Cajamarca Department.

Etymology.

This new species is named in honor of the Peruvian poet Marco Antonio Corcuera Díaz, who heralded the protection of Bosques de Cachil, where the type series was collected.

Figures

Figure 6. Atopsyche corcuerai sp. nov., wing venation. A. Forewing; B. Hindwing.

Figure 7. Atopsyche corcuerai sp. nov., male genitalia. A. Segments IX and X, lateral; B. Right parapod and preanal appendage, dorsal; C. Inferior appendages, ventral; D. Phallic apparatus, lateral; E. Phallic apparatus, dorsal.