Atopsyche sofiae, Rázuri-Gonzales & Holzenthal, 2025

Atopsyche sofiae sp. nov.

Figs 12 View Figure 12 , 13 View Figure 13

Type material.

Holotype. Peru • 1 ♂; La Libertad, Provincia Bolivar, Laguna Quishuar ; 7.6049°S, 77.5376°W, 3482 m a. s. l.; 31 Mar. 2011; C. Carranza leg.; light trap; MUSM -ENT-320966 ( MUSM) GoogleMaps . Paratype. Peru • 1 ♂; same data as the holotype ( UMSP) GoogleMaps .

Diagnosis.

Atopsyche sofiae also belongs to the bicolorata species group of Schmid (1989), characterized by having short inferior appendages and a broad notch apically on the first segment of these appendages. The second segment is reduced and inserted at the posterodorsal corner or in the notch of the first segment. Among the species in this group, the new species most closely resembles A. yupanqui Schmid, 1989 ( Venezuela). In both species, the first segment of the inferior appendage is rectangular, with the posterodorsal and posteroventral corners slightly projecting mesad rather than posterad, and the second segment is inserted in the notch formed by these corners. In A. sofiae , however, these corners are more pronounced, forming a concavity where the strongly reduced second segment is inserted (not visible in lateral view). Additionally, the posterodorsal corner is densely covered with peg-like setae and the posteroventral corner bears thick, spine-like setae (features absent in A. yupanqui ). Though both species have a quite simple phallic apparatus, the ventrolateral branch of the phallotheca in A. sofiae curves ventrad, while in A. yupanqui it is directed posterad. Finally, the parapods are slender in both species, but in A. sofiae , the parapods taper to an acute apex and bear a pair a peg-like setae basally. In contrast, the parapods in A. yupanqui do not taper, have a notched apex, and bear no peg-like setae.

Description.

Adult. Forewing length: male ( 13.5 mm, n = 2). Body and wings pale brown. Forewings with erect setae on veins without distinct pattern, with dark brown setae along costal margin, wing apex with fringe of brown setae. Wing venation as in Fig. 12 View Figure 12 . Sternum III and IV without glands; sternum V with a pair of long, membranous glands; processes on sternum VI and VII strongly reduced; process on sternum VI rounded in ventral view, with four spine-like setae, process on sternum VI triangular in ventral view, with densely clumped group of 8 spine-like setae with blunt apices (this process is absent in the paratype).

Male genitalia (Fig. 13 View Figure 13 ). Segment IX, in lateral view, quadrangular, almost as high as long, posteroventral margin produced and blunt (Fig. 13 A View Figure 13 ). Parapod, in lateral view, elongate, digitate, slightly broader basally, tapering towards apex, directed slightly ventrad, with a group of setae apically and pair of peg-like setae basolaterally, apex narrowly rounded (Fig. 13 A View Figure 13 ); in dorsal view, flattened, lateral margin slightly sinuous, mesal margin almost straight, with a group of setae apically and peg-like setae on lateral flange, apex acute (Fig. 13 B View Figure 13 ). Filipod digitate, longer than parapods, setose (Fig. 13 A View Figure 13 ). Preanal appendage short, rounded, setose (Fig. 13 A View Figure 13 ). First segment of inferior appendage, in lateral view, rectangular, ventral margin almost straight, slightly concave basally (left side on paratype much more convex), dorsal margin slightly convex mesally, posteroventral and posterodorsal corner produced mesad forming a socket where the second segment is inserted (left posteroventral corner on paratype directed more ventromesad), posterodorsal corner densely covered with short, peg-like setae, posteroventral corner with long, spine-like setae, with setae on dorsal, ventral, and apical margins and lateral surface (Fig. 13 A View Figure 13 ); in ventral view, reniform, setose, lateral margin slightly convex, mesal margin convex with apical truncate projection (Fig. 13 C View Figure 13 ); second segment of inferior appendage, in lateral view, reduced, rounded (Fig. 13 A View Figure 13 ); in ventral view, reniform, slightly curved mesad, apex truncate (Fig. 13 C View Figure 13 ). Proctiger, in lateral view, narrow basally, slightly wider apically, with a long diagonal carina, slightly membranous, apex truncate (Fig. 13 A View Figure 13 ). 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, hooked, ~ 0.25 × as long as posterior half of phallotheca, curved ventrad, acute apically; dorsal process of phallotheca absent; posterior section of phallotheca, in lateral view, broad basally, tapering towards apex, with a faint ridge on lateral margin, directed slightly posteroventrad, apex narrowly rounded (Fig. 13 D View Figure 13 ); in dorsal view, with a deep notch mesally (Fig. 13 E View Figure 13 ); phallic spine elongate, stout, spine-like structure, with slight curvature near base, then slightly sinuous (Fig. 13 D View Figure 13 ); in dorsal view, apex acute (Fig. 13 E View Figure 13 ).

Distribution.

Peru: La Libertad Department.

Etymology.

This species is named after Sofia Carranza Pereyra, daughter of the collector of the type specimens.