Regasilus aiapaec, Sánchez, 2020

Sánchez, Pável, 2020, Eight new species of Regasilus Curran, 1931 (Diptera: Asilidae: Asilinae) from Peru, Zootaxa 4894 (2), pp. 221-246 : 225

Regasilus aiapaec sp. nov.

( Figs. 4–5 )

Diagnosis. All femora wholly black. This species is easily recognized by having 4–6 apical scutellar macrosetae, whereas its congeners have only two. Furthermore, the microtrichia present on the apical third of the wing are also abundant at the sides of basal fourth of R 4+5, r–m, and m–cu, hence, at first glance, the wing seems to have three central dark spots ( Fig. 4C ).

Description of male holotype. ( Fig. 4A ). Lengths. Body: 16 mm; wing: 11 mm.

Head. Antenna black, scape and pedicel black setose, scape about twice as long as pedicel; postpedicel similar in length to scape and pedicel together, about 10 times as long as first article of antennal stylus and 1.5 times the length of second article; face, frons and vertex golden cinereous tomentose; ocellar setae black, quite long, about 1.5 times the length of scape and pedicel together; mystacal macrosetae wholly black; proboscis and labium yellowish setose; palpus with black setae; postocular macrosetae black, some of them, above, strongly proclinate at tip, almost at 90°; occiput golden cinereous tomentose, yellowish setose. Thorax. Dark brown; pronotum and mesonotum golden tomentose, except for the dark paramedial and lateral mesonotal stripes, besides posteriorly and towards scutellum tomentum becomes cinereous; similarly, pleural tomentum is golden cinereous anteriorly and mainly cinereous tomentose posteriorly. Chaetotaxy: Pronotum yellowish setose, with two pairs of yellowish macrosetae on antepronotum; postpronotal lobe mostly black setose, some yellowish setae; mesonotum with black macrosetae, 2 notopleural, 3 supra-alar (alongside several long setae) and 1 postalar; dorsocentral and acrostichal setae black, short on the anterior third and becoming longer and bristly anterior to transverse suture; scutellar disc with black setae, 6 apical scutellar black macrosetae; uppermost portion of anepisternum with long erect black setae; katepisternum, anepimeron and metanepisternum mostly yellow setose, some black setae; katatergal macrosetae mainly black. Wing ( Fig. 4C ). Base hyaline; microtrichia, besides apical third, also abundant at sides of basal fourth of R 4+5, r–m, and m–cu, thus, at first glance, wing seems to have three central dark spots; R 2+3 sinuous beyond R 4 and R 5 bifurcation; R 4 and R 5 bifurcation arising just before discal cell apex (M 2 base); crossvein r–m situated slightly anterior to middle of discal cell; R 5 strongly sinuous; halter yellowish. Leg. Coxae black, golden cinereous tomentose; all femora shining black, hind femur somewhat swollen; tibiae reddish brown with dark apex; tarsi, empodia and claws dark; pulvilli yellowish. Chaetotaxy: Coxae and femora yellowish setose; femora and tibiae mainly with black macrosetae; mid femur with 5–6 anteroventral and 3 anterior; hind femur with 4 anterior, 10–11 anteroventral, 5–6 posteroventral, some of them pale and weak, and dorsally 1 subapical on each side; fore tibia with 1 dorsal, basal, 4–5 posterodorsal, and 3 posteroventral, quite long; mid tibia with 1 anterodorsal, 2 dorsal, 3 posterior, 1–2 posteroventral and 3 anteroventral; hind tibia with 1 dorsal, 3 posterodorsal, 3 anterodorsal and 3 anteroventral. Abdomen. Dark brown, subshining, golden cinereous tomentose on sides and posterior margins of tergites; yellowish setose, setae longer on sides; sternites fully covered with golden cinereous tomentum, also yellowish setose, except sternite 8, with an apical band of black macrosetae. Terminalia ( Figs. 4B, D ). Epandrium shining black, elongate, slightly attenuated medially and widening towards apex, which is distinctly angled downwards, setae quite long and black on first half, yellowish towards apex, which bears conspicuous spiny yellowish macrosetae on posterior margin; hypandrium reddish brown, with long black macrosetae, excision at posterior margin v-like ( Fig. 4G ); gonocoxite concolorous with hypandrium, subtriangular, apex blunt and long, black setae on external margin ( Fig. 4F ); gonostylus curved backwards, hidden by epandrium in lateral view, as a result phallus is quite visible in lateral view; phallus strongly flattened laterally, curved upwards at apical fourth, ejaculatory apodeme wide in lateral view, medium sized ( Fig. 4E ).

Female ( Fig. 5A ). Similar to male, except terminalia ( Fig. 5B ); spermathecae strongly attenuated and coiled apically, comma shaped, situated almost at base of seventh abdominal segment; common duct longer than arms of furca; expulsory ducts about half the length of capsular ducts, and together one third the length of common duct ( Fig. 5C ).

Figures

FIGURE 4. Regasilus aiapaec sp. nov. Male holotype. A. Habitus lateral; B. Terminalia, lateral view; C. Wing; D. Terminalia, dorsal view; E. Phallus, lateral and dorsal views; F. Gonocoxite and gonostylus; G. Hypandrium. Abbreviations. d, discal cell; ej apod, ejaculatory apodeme; epd, epandrium; goncx, gonocoxite; goncx apod, gonocoxal apodeme; gonst, gonostylus; hypd, hypandrium; M 1, first branch of media; M 2, second branch of media; M 3, third branch of media; M 4, fourth branch of media; m–cu, medial–cubital crossvein; R 1, anterior branch of radius; R 2+3, second branch of radius; R 4, upper branch of third branch of radius; R, third branch of radius; R, lower branch of third branch of radius; r–m, radial–medial crossvein

FIGURE 5. Regasilus aiapaec sp. nov. Female paratype. A. Habitus lateral; B. Terminalia, ovipositor, lateral view; C. Furca and spermathecae. Abbreviations. ar, arms of furca; cap duct, capsular duct; cerc, cercus; com duct, common duct; exp duct, expulsory duct; f apod, furcal apodeme; med scl, median sclerite (remnant of tergite 9); spmth, spermathecae; tg 6, tg 7, tg 8, tg 10, abdominal tergites.