Dasybasis huaynai González & Yábar, 2024

González, Christian R. & Yábar, Erick, 2024, Two new species of Dasybasis Macquart from the Peruvian Andes of Cusco (Diptera: Tabanidae: Diachlorini), Zootaxa 5418 (4), pp. 385-392 : 388-390

Dasybasis huaynai González & Yábar sp. nov.

( Figs. 3a–j )

Type locality: Patabamba, 3940 m, Calca , Cusco, Peru ,

Diagnosis. Length 8.0 mm. Body color dark brown ( Fig. 3a ). Eyes with abundant long gray ommatrichia ( Fig. 3d ). Frons wide, slightly convergent anteriorly, gray pruinose with long gray and black setulae; frontal index 1.5 ( Fig. 3c ). Basal callus rectangular, without median dorsal projection ( Fig. 3c ). Ocellar triangle and ocelli absent. First flagellomere angulate ( Fig. 3e ). Maxillary palpus stout, tapered, with abundant long black setulae ( Fig. 3f ). Scutum dark gray. Wings slightly smoky ( Fig. 3g ); vein R 4 with short appendix. Abdomen dark brown, medial zone darker, distal margin of tergites lighter, medial zone with yellowish setulae on tergites 2–7 ( Fig. 3b ).

Description (Holotype ♀)

Female. Head. Length 8.0 mm, wing length 8.5 mm. Body color dark brown ( Fig. 3a, b ). Frons wide, slightly convergent anteriorly, pruinose gray with long gray and black setulae; frontal index 1.5 ( Fig. 3c ). Basal callus shiny black, rectangular, dorsal margin with irregular border, without median dorsal projection, touching subcallus and eyes ( Fig. 3c ). Eyes dark brown with abundant long gray ommatrichia ( Fig. 3d ). Vertex pruinose dark gray with long gray setulae. Ocellar triangle and ocelli absent. Subcallus pruinose gray laterally with short setulae. Parafacial and gena pruinose gray with long gray and black setulae ( Fig. 3d ). Antennal scape gray with abundant long, semi-erect, black setulae on both surfaces, slightly wider than first flagellomere; pedicel gray, bearing short black setulae on distal margin and long gray and black setulae on ventral surface, with long dorsal projection. First flagellomere black, with an obtuse angle, apical flagellomeres black, short and thickened ( Fig. 3e ). Maxillary palpus with pruinose yellow, stout, first segment rounded, yellow-gray with long black and gray setulae; second segment 2X length of the first, somewhat tapered, with abundant long black setulae ( Fig. 3f ), median side without setulae. Proboscis the same height as head, dark brown with yellow setulae, labellum large, fleshy ( Fig. 3f ). Occiput pruinose gray with gray setulae on dorsal margin. Thorax. Scutum dark gray, bearing sparse, short, yellow setulae, mostly posterior to transverse suture, remainder of scutum with abundant black setulae and two gray longitudinal stripes. Postpronotal lobes concolorous black, with long black setulae. Scutellum dark gray, with long black setulae laterally, shorter on the disc. Pleura pruinose gray with long black and gray setulae; anepisternum with long gray and black setulae; katepisternum and katatergite with long gray setulae. Legs brown, coxae pruinose gray with long gray and black setulae, femora dark brown with long black setulae; tibiae darker, with long black setulae; remaining leg segments with short black setulae. Wing slightly smoky and brown in the costal and subcostal cells, with brown clouds on R 4, base of R 5, base of M 1 and discal cell, and base of CuA 2 and CuA 1; R 5 and M 1 parallel; cell r 5 widely open; veins Sc and R 1 with short black setulae; vein R 4 with a short appendix ( Fig. 3g ). Basicosta bare. Halter light brown. Squamae concolorous with wing base. Upper calypteres yellowish, lower calypteres lighter, with long yellow setulae. Abdomen. Dark brown dorsally, medial zone darker, distal margin of tergites lighter, medial zone with yellow setulae, tergites 2–7 laterally with long black and gray setulae ( Fig. 3b ). Sternites pale brown with long black setulae. Terminalia ( Fig. 3 h-j). Cerci darkly sclerotized, subquadrate ( Fig. 3h ). Tergite 10 ovoid, medially divided; tergite 9 darkly sclerotized, widely divided. Hypoginal valve with distal border slightly projecting and with long setulae ( Fig. 3i ). Hypogynium slightly convex, wide at base, with long setulae. Genital fork with narrow base, neck wide basally, slightly convex, with short spines present on comb ( Fig. 3j ). Spermathecal ducts extended from genital fork, caudal end of spermathecal ducts with cup-like expansions ( Fig. 3j ).

Distribution. Known only from the holotype from the Calca (Cusco), Perú.

Type material. Holotype ♀, Patabamba , 3940 m, Calca, Cusco, 03.Jun.1992, PERU, E. Yábar coll. ( UNSAAC).

Immature stage: unknown.

Etymology. The specific epithet is in honor of the emperor Inca Huayna.

Figures

FIGURE 3. Holotype female of Dasybasis huaynai sp. nov. a. Habitus in lateral view (scale bar = 3.0 mm); b. Habitus in dorsal view (scale bar = 3.0 mm); c. Head in frontal view (scale bar = 1.0 mm); d. Head in lateral view (scale bar = 0.5 mm); e. Antennae (scale bar = 0.5 mm); f. Maxillary palpus (scale bar = 0.5 mm); g. Wing (scale bar = 3.0 mm); h. Terminalia female: cerci (cerc), spermatheca (sper), spermathecal ducts (sp duc) (scale bar = 0.2 mm); i. cerci (cerc), hyp va (hypogynial valve), dorsal view (scale bar = 0.2 mm); j. Genital fork, spermathecal ducts (sp duc), dorsal view, spines (spi) (scale bar = 0.2 mm).