Ochrotrichia lapuki, Rocha & Santos & Nessimian, 2023

Rocha, Isabela Cristina, Santos, Allan Paulo Moreira & Nessimian, Jorge Luiz, 2023, Taxonomic diversity of Ochrotrichiinae (Trichoptera: Hydroptilidae) from Peru with the description of ten new species, a new distributional record, and an updated checklist, Zootaxa 5353 (4), pp. 301-331 : 320-321

Ochrotrichia lapuki sp. nov.

Figs 12 , 13

Description, male. Head. Wider than long, frontal margin convex, ocellar setose warts small, subtriangular, posterior setose warts transversely ellipsoidal with longitudinal length about 1/2 transverse width ( Fig.12A ). Antennae each 22-articulated, scape about 2x as long as wide, median flagellomeres each about 2x as long as wide and with setae scattered over entire flagellomere, apical flagellomere conical.

Thorax. Metascutellum subtriangular. Length of each forewing: holotype 2.1 mm. Wings strongly tapered from near bases, acute apically. Forewings with apical forks II and III present; R1 vein short; M1 vein fused to R5 basally; Cu1 vein reaching wing margin; jugal lobe present ( Fig. 12B ). Hind wings with apical fork V present; various other veins fused or absent ( Fig. 12C ) .

Pregenital abdominal segments. Segments V and VI with no modifications. Sternite VII with ventromesal process triangular.

Genitalia. Sternum IX covered with long setae; in lateral view, trapezoidal, tapering anteriorly ( Figs 13A, 13B ); in ventral view, anterior margin convex and posterior margin slightly projecting mesally ( Fig. 13D ). Tergum IX expanding anterad, fusing posteriorly with tergum X ( Fig. 13C ). Inferior appendages slightly asymmetrical, each with dorsal and ventral lobes bearing digitate processes ending in a stout spine; dorsal lobe elongate, about 2x as long as segment IX, apex round, each with digitate process basally; ventral lobe each with three digitate processes, one about 1/2 as long as dorsal lobe, two similarly placed on right and left appendages along with membranous process between them bearing two small apical setae on each appendage ( Figs 13A, 13B ). Preanal appendages and subgenital processes absent. Tergum X asymmetrical, with a long, curved, dorsal process bearing dorsally two large black setae subapically; in dorsal view, right side with acute process not surpassing dorsal process, left side with broader process extending beyond posterior margin of tergum ( Fig. 13C ); in lateral views, each side with acute process arising at posterolateral margin of tergum ( Figs 13A, 13B ). Phallus tubular, nearly same diameter through entire length, ejaculatory duct slightly sclerotized, not protruding apically, subapical spines absent ( Fig. 13E ).

Remarks. The presence of two large black setae on tergum X, and the inferior appendages each with a fingerlike dorsal lobe and bearing several spines make O. lapuki sp. nov. a member of the O. arranca Group ( Flint 1972). It is mostly similar to O. anticheirion Thomson & Armitage 2018 , from Panama, and O. arranca ( Mosely 1937) , from Costa Rica and Mexico, because of the shape of the inferior appendages and tergum X. However, O. lapuki sp. nov. can be separated from these by the number and arrangement of the spine-bearing processes of the ventral lobe of the inferior appendages. In O. anticheirion and O. arranca , these processes are not symmetrically positioned on right and left appendages as they are in the new species. Additionally, in O. lapuki sp. nov., the dorsal lobe of each appendage bears a basal process, which is absent in O. anticheirion , and the ventral lobe of the new species lacks the peg-like seta on the ventral surface that is present on each appendage of O. anticheirion .

Material examined. Holotype. Peru: Cusco: Quincemil, 19 km W, Rio Araza, Ponte Saucipata , 13º20’10”S 70º50’57”W, 874 m, Malaise, 23–31.viii.2012, RR Cavichioli, JA Rafael, APM Santos, DM Takiya leg., male ( MUSM) . Paratype. same data as holotype, 1 male ( DZRJ) .

Etymology. Lapuk is a Quechua adjective for wet (= lapuki ), in reference to the Quincemil community, the rainiest region of Peru and where the holotype was collected. The species epithet is not a Latin or latinized word; therefore, it is to be treated as indeclinable and does not need to agree in gender with its generic name.

Figures

FIGURE 12. Ochrotrichia lapuki sp. nov. 12A, head, dorsal. 12B, right forewing, dorsal. 12C, right hind wing, dorsal. Abbreviations: o.s.w = ocellar setal wart (paired); p.s.w = posterior setal wart (paired).

FIGURE 13. Ochrotrichia lapuki sp. nov., male genitalia. 13A, left lateral; 13B, right lateral; 13C, dorsal; 13D, ventral; 13E, phallus, left lateral. Abbreviations: IX = segment IX; X = tergum X.