Discomyza fagomoga, Zatwarnicki, Tadeusz & Cielniak, Magdalena, 2015

Zatwarnicki, Tadeusz & Cielniak, Magdalena, 2015, A review of the genus Discomyza (Diptera: Ephydridae) from Afrotropical, Australasian / Oceanian and Oriental Regions, Zootaxa 3963 (1), pp. 1-26 : 14-17

Discomyza fagomoga sp. nov.

Figs 12 , 24 , 35–43 , 45–46

Diagnosis. This species is similar to D. dolichocerus but can be distinguished from it and other congeners by the elongated antennae with completely red basoflagellomeres and a wing pattern bearing a wide spot around crossvein dm-m, which is connected with an anterior infuscation.

Description. Body length 1.92–2.35 mm. Head ( Fig. 35 ). Head height-to-width ratio 0.81–0.84; frons heightto-width ratio 0.48–0.55; frons shiny laterally, ocellar triangle subshiny covered by sparse setulae, the rest is dull, without cavities, above antenna white microtomentose spot; posterior orbital seta strong, anterior orbital seta reduced, on its place are 3 setulae along eye margin. Antenna yellow; basoflagellomere elongate, 3.0x as long as wide; arista with 7–10 dorsal rays. Face ( Fig. 36 ) wrinkled, between antennae small spot of microtomentum, in dorsal part 4 transverse folds, 4 quadrate pits laterally; in ventro-lateral part 3 oblique folds, in the middle 6 transverse narrow ribs, 3 facial setae in ventral part of face; parafacialia shining in dorsal half, then gradually became white microtomentum on the level of mid seta; facial width-to-head width ratio 0.22–0.30; facial width-toheight ratio 0.41–0.53; gena-to-eye ratio 0.07–0.14; eye width-to-height ratio 0.61–0.66. Palpus dark brown.

Thorax. Mesonotum greyish black, subshiny; scutellum trapezoidal. Wing ( Fig. 45 ) infuscated on anterior margin limited by vein R4+5, then ¼ apical of cell r4+5 and transverse band of width equal to the length of crossvein dm-m across cell r4+5, as well as along crossvein dm-m, its posterior margin rounded; crossvein dm-m slightly sinuate; costal vein ratio 0.66–0.76; M vein ratio 0.87–0.95. All legs except tarsi back, fore basitarsomere whitish, mid and hind 1–4 tarsomeres yellowish, other blackish brown. Distal half of forefemur bearing anteroventral comb-like row of setulae. Stem of halter dark grey, knob white.

Abdomen: Tergites 1–4 greyish black and dull, tergite 5 shiny; tergites with similar length. Male terminalia ( Figs 37–43 ). Epandrium in ventral view ( Fig. 37 ) nearly as wide as high, with moderate cercal cavity, which is slightly higher than half of epandrial height; cercus in ventral view ( Fig. 37 ) moderate, semicircular; pregonostylus in ventral view ( Fig. 37 ) trapezoidal with slightly sinuate lateral margin and sharp anterior apex, medial margin bears 2 setae, which are equal to epandrial setae on anterior surface; pregonostylus ( Figs 38–41 ) asymmetrical, bearing large, thick mediosub-basal lobe-like setae; left pregonostylus in ventral view ( Fig 38 ) arcuate, tapered apically, medially setulose; in lateral view ( Fig. 39 ) irregularly triangular, medially setulose; right pregonostylus in ventral view spatulate with latero-basal broadening, margins setulose ( Fig. 40 ), in lateral view ( Fig. 41 ) finger-like with 2 dorsal projections in 1/3 and 2/3 of its length; aedeagus in ventral view ( Fig. 42 ) pentagonal with mediolateral moderately rounded lobes; aedeagus in lateral view ( Fig. 43 ) 2x as long as high, with sinuate dorsal margin, making medio-dorsal projection; phallapodeme in lateral view ( Fig. 43 ) semicircular.

Etymology. The specific name is an anagram of the type locality.

Type material. Holotype male in very good condition is double mounted and is labelled: “ ETHIOPIA: GAMO GOFA, 3 kmNE ArbaMinch, 1300m, 'Forest', 5. ii. 2000 A. FREIDBERG & I. YAROM ” and is preserved in USNM. From eight paratypes five are from D. R. Congo (North Kivu: Virunga National Park) and 2 ♂, 2 ♀ are labelled: “ Congo belge North Kivu: Parc. Nat. Albert, Nzulu (Sake), 1500 m, 14. II. 1934, G. F. de Witte” ( MRAC); and 1 ♂ “ Congo belge PNA 14. VIII. 1952 P. Vanschuytbroeck & J. Kekenbosch” ( MRAC); three other are from Tanzania and 1 ♂ is labelled: “ TANZANIA E. Usambara Amani, 800–1500 m 13. viii. 2003 L. FRIEDMAN” ( USNM); 1 ♀ “ Tanzania East Usambara Amani, 1000 m 28. ii. 1977 ”, “Zool. Mus. Copenhagen. H. Enghoff, O. Lomholdt, O. Martin leg.” ( ZMUC), and 1 ♂ bears same labels except “ 6. ii. 1977 ” ( ZMUC).

Other material examined: D. R. CONGO: Oriental Prov.: Bomane village area at: 01º16.283'N, 23º43.994'E, 20/ 24. V. 2010, A. H. Kirk-Spriggs, 1 ♀ ( BMSA). KENYA: Mt Kenya, Timau, 22. VIII. 1983, A. Freidberg, 1 ♀; Kakamega Forest, 22. XI. 1989, A. Freidberg. F. Kaplan, 1 ♀ ( USNM). UGANDA: Ruvenzori Range, Kilembe, 1400 m, XII.1934 – I. 1935, F. W. Edwards, 1 ♂ ( BMNH).

Distribution ( Fig. 12 ): Afrotropics: D. R. Congo, Ethiopia, Kenya, Tanzania and Uganda.

Figures

FIGURE 12. Distribution map of Discomyza africana sp. nov., D. dolichocerus, and D fagomoga.

FIGURES 22 – 24. Wings and head. 22. Wing of Discomyza africana, 23. Wing of Discomyza dolichocerus. 24. Head of Discomyza fagomoga sp. nov., lateral view. Scale bar 0.5 mm.

FIGURES 35 – 36. Head of Discomyza fagomoga sp. nov. 35. General view, anterior view. 36. Details in the central part, anterior view. Scale bar 0.5 mm.

FIGURES 37 – 43. Hypopygium of Discomyza fagomoga sp. nov. 37. External male terminalia (epandrium, cerci and pregonostyli), ventral view. 38 – 39. left postgonostylus. 38. ventral view. 39. lateral view. 40 – 41. right postgonostylus. 40. ventral view. 41. lateral view. 42 – 43. Phallapodeme and aedeagus. 42. ventral view. 43. lateral view. Scale bar 0.1 mm.

FIGURES 44 – 46. Wings and head with mesonotum. 44. Wing of Discomyza eritrea. 45. Wing of Discomyza fagomoga sp. nov. 46. Head with mesonotum of Discomyza fagomoga sp. nov., dorsal view. Scale bar 0.5 mm.