Regasilus Curran, 1931

Sánchez, Pável, 2020, Eight new species of Regasilus Curran, 1931 (Diptera: Asilidae: Asilinae) from Peru, Zootaxa 4894 (2), pp. 221-246 : 222

Regasilus Curran, 1931

Regasilus Curran, 1931:24 .

Type-species, Regasilus strigarius Curran, 1931 (as strigaria , error), by original designation.

Diagnosis. Regasilus is characterized by the following combination of characters: 1. Anatergite bare; 2. Scutellum with impressed rim; 3. Mystax with about six remarkably stout macrosetae placed in a triangular area near the lower facial margin; 4. Scape and pedicel bearing conspicuous ventral and lateral macrosetae (Fig. 207, Hull 1962); 5. Apical third of wing darkened by dense microtrichia ( Fig. 2 ); 6. Fore femora without prominent macrosetae; 7. Eighth sternite in males bearing a dense and conspicuous band of macrosetae apically ( Fig. 4B ); 8. Hypandrium with a posterior and central excision ( Fig. 3F ); 9. Female ovipositor apubescent and laterally compressed from sixth abdominal segment ( Fig. 5B ); 10. Common duct long, with three strongly attenuated and apically-coiled spermathecae ( Fig. 5C ); and 11. Median sclerite at posterior end of furca (remnant of tergite 9) present ( Fig. 5C ).

Comments. From examination of specimens of the Glaphyropyga group housed in MZUC–UCCC, as well as the illustrations in Artigas & Papavero (1995) and Artigas (1971), Regasilus is morphologically similar to Leptoharpacticus Lynch Arribálzaga, 1880 and Megalometopon Artigas & Papavero, 1995 (a replacement name for Megametopon Artigas, 1970 , a junior homonym), since these three genera share features such as the fore femora without prominent macrosetae, eighth sternite with an apical band of macrosetae in males, presence of a median sclerite at posterior end of furca in females, and a long common duct with three strongly attenuated and apicallycoiled spermathecae. Although Leptoharpacticus is easily distinguishable owing to its shallow facial gibbosity, plus other differences, to distinguish Regasilus from Megalometopon is more difficult, since the diagnosis given for Regasilus herein also keys out to Megalometopon , except for character 3. In Megalometopon the mystacal macrosetae are uniform, nevertheless some other features of this genus are observed in the variation range of the species of Regasilus described in this work. Therefore, the relationship between these two genera needs to be reevaluated, since Artigas (1971) and Artigas & Papavero (1995) established Megalometopon without examining any specimens of Regasilus , raising the possibility that these genera are subjective synonyms.

Figures

FIGURE 2. Wing venation. Regasilus huiracocha sp. nov. Paratype. Abbreviations. al, alula; bm, basal medial cell; br, basal radial cell; C, costal vein; CuA,anterior branch of cubital vein; cua, anterior cubital cell; CuP, posterior branch of cubital vein; cup, posterior cubital cell; d, discal cell; fal vn, false vein; M 1, first branch of media; m 1, first medial cell; M 2, second branch of media; m 2, second medial cell; M 3, third branch of media; m 3, third medial cell; M 4, fourth branch of media; m 4, fourth medial cell; m–cu, medial–cubital crossvein; m–m, medial crossvein; R 1, anterior branch of radius; r 1, first radial cell; R 2+3, second branch of radius; r 2+3, second + third radial cell; R 4, upper branch of third branch of radius; r 4, fourth radial cell; R, third branch 4+5 of radius;R , lower branch of third branch of radius; r , fifth radial cell; r–m, radial–medial crossvein; Sc, subcostal vein.

FIGURE 3. Regasilus strigarius Curran, 1931. Male from Baños.A. Habitus lateral; B. Terminalia, dorsal view; C. Terminalia, lateral view; D. Phallus, lateral and dorsal views; E. Gonocoxite and gonostylus; F. Hypandrium. Abbreviations. cerc, cercus; ej apod, ejaculatory apodeme; epand, epandrium; goncx, gonocoxite; goncx apod, gonocoxal apodeme; gonst, gonostylus; hypd, hypandrium; ph, phallus; st 8, eighth sternite.

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.