Regasilus illapa, Sánchez, 2020

Sánchez, Pável, 2020, Eight new species of Regasilus Curran, 1931 (Diptera: Asilidae: Asilinae) from Peru, Zootaxa 4894 (2), pp. 221-246 : 234-236

Regasilus illapa sp. nov.

( Figs. 12–13 )

Diagnosis. Legs and thorax reddish brown, tomentum predominantly cinereous, almost silvery, giving to this species a whitish appearance. Male terminalia shining brownish; epandrium thin, its apex pointing down ( Fig. 12B ); phallus narrow, and ejaculatory apodeme quite large ( Fig. 12D ).

Description of male holotype. ( Fig. 12A ). Lengths. Body: 15 mm; wing: 9 mm.

Head. Antenna dark brown, scape and pedicel black setose, though some whitish setae are present dorsally; postpedicel similar in length to scape and pedicel together, about 10 times as long as first article of antennal stylus and about 1.3 times the length of second article; face, frons and vertex cinereous tomentose; ocellar setae black, no longer than length of scape and pedicel together; mystacal macrosetae black in the upper face and pale yellowish bellow; proboscis, labium and palpus whitish setose; postocular macrosetae black above, pale yellowish bellow; occiput cinereous tomentose, white setose. Thorax. Dark brown, fully covered with cinereous tomentum, except for the dark paramedial and lateral stripes on mesonotum. Chaetotaxy: Pronotum yellowish setose with some pale and weak macrosetae on antepronotum; postpronotal lobe whitish setose; mesonotum with black macrosetae, 2 notopleural, 1 supra-alar (alongside with a few short setae) and 1 postalar; dorsocentral and acrostichal setae black, short anteriorly and becoming longer posterior to transverse suture; scutellar disc white setose, 2 apical scutellar black macrosetae; uppermost portion of anepisternum and katepisternum whitish setose; katatergal macrosetae pale yellowish. Wing. Similar to R. apu sp. nov., halter yellowish. Leg. Coxae black, cinereous tomentose; femora mainly brownish, base reddish brown, concolorous with tibiae and tarsi, though these become darker at apex; empodia and claws dark brown, pulvilli yellowish. Chaetotaxy: Coxae and femora whitish setose; femora mainly with white macrosetae, some on tibiae; mid femur with 5–6 anteroventral and 3 anterior; hind femur with 3–4 anterior, 10–12 anteroventral, 5–6 posteroventral, most of them pale and weak, and dorsally 1 subapical on each side; fore tibia with 1 dorsal, basal, 4 posterodorsal, and 3 posteroventral, quite long; mid tibia with 1 anterodorsal, 2 dorsal, 3 posterior, 1–2 posteroventral and 2 anteroventral; hind tibia with 1 dorsal, 2 anterodorsal, 3 posterodorsal and 2 anteroventral. Abdomen. Dark brown, subshining, cinereous tomentose on sides and extending to posterior margins of tergites, white setose, setae longer laterally; sternites fully cinereous tomentose and white setose, except sternite 8, with an apical band of long black macrosetae. Terminalia ( Figs. 12 B–C). Shining brown; epandrium elongate and thin, with a pointing-down apex, black long setae on base and whitish towards apex, with conspicuous spiny macrosetae on posterior margin present; hypandrium broad, long white setose, excision at posterior margin cuplike ( Fig. 12F ); gonocoxite subtriangular with irregular apex and white long setae on external margin ( Fig. 12E ); gonostylus curved upwards, usually visible in lateral view; phallus narrow, almost straight, the ejaculatory apodeme wide in lateral view, quite large, reaching the seventh segment ( Fig. 12D ).

Female ( Fig. 13A ). Similar to male, except terminalia ( Fig. 13B ); spermathecae situated almost at base of seventh abdominal segment, strongly attenuated and coiled apically; common duct almost as long as arms of furca; expulsory ducts about 0.75 times the length of capsular ducts and a third the length of common duct ( Fig. 13C ).

Etymology. A masculine noun in apposition, given to Illapa, the Inca god of thunder and rain, specially revered by people in times of drought.

Distribution ( Fig. 20B ). Peru; Tayacaja, province in the Department of Huancavelica.

Holotype condition. Good. Detached terminalia placed in microvial with glycerin and pinned along with the specimen. As well as detached right wing.

Type material. Holotype. PERU, HV [Huancavelica], Tayacaja, Colcabamba , 1614 m 12°17’19”S, 74°41’16.2”O 02.ii.2014 F. Meza / HOLOTYPE Ƌ Regasilus illapa Sánchez, 2020 ( MUSM) . Paratypes: Same data as holotype (3 Ƌ, 1 ♀) ; PERU, HV, Tayacaja Colcabamba CP Ranra, 2647 m, 12°19’8.1”S, 74°44’22.5”O, 17.vi.2019 E. Medina leg. / PARATYPE ♀ Regasilus illapa Sánchez, 2020 ( MUSM) .

Figures

FIGURE 12. Regasilus illapa sp. nov. Male holotype. A. Habitus lateral; B. Terminalia, lateral view; C. Terminalia, dorsal view; D. Phallus, lateral and dorsal views; E. Gonocoxite and gonostylus; F. Hypandrium. Abbreviations. ej apod, ejaculatory apodeme; epand, epandrium; goncx, gonocoxite; goncx apod, gonocoxal apodeme; gonst, gonostylus; hypd, hypandrium; ph, phallus.

FIGURE 13. Regasilus illapa 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.

FIGURE 20. A–B. Distribution of Regasilus species.? = doubtful record.