Ataenogera minuta Lyneborg

Hauser, Martin & Webb, Donald W., 2007, A revision of the new world stiletto fly genus Ataenogera Kröber (Diptera: Therevidae: Phycinae) with the description of two new species, Zootaxa 1530, pp. 41-67 : 62-65

Ataenogera minuta Lyneborg

( Figs. 48–56 )

minuta Lyneborg (2002:104, sp. key; 2002:105, Figs. 3 male ant., 4– 7 male genit., 106 male desc.) ( Ataenogera ). Type locality Peru, Apurimac, Cuzco-Abancay road, Apurimac crossing at Cuya. Holotype male in BMNH by original designation.

Diagnosis. Ataenogera minuta shares with A. argentifrons , A. grandis , and A. minuta the absence of lanceolate setae on the male and female abdomens. It differs from A. argentifrons in having the frons convergent dorsally ( Figs. 48–49 ) with setae present dorsolateral to the antennal bases; the coxal macrosetae dark reddish brown; and the male gonocoxite lacking a pair of large falcate projections posterolaterally. It differs from A. irwini in having the anepisternum covered with gray pubescence and with setae over the entire anepisternum. It differs from A. grandis in being much smaller; possessing one pair of dorsocentral macrosetae; and the male distiphallus ( Fig. 55 ) lacking a large dorsal carina.

Redescription of holotype male (MEI 147915)

Body length 4.8 mm.

Head. Head length 0.60 mm. Eyes dichoptic ( Fig. 48 ), separated by distance twice width of ocellar tubercle; ommatidia of equal size. Frons ( Fig. 48 ) converging dorsally, dark reddish brown, pubescence white, more dense dorsal to antennal bases with small glossy triangle medially; setae pale brown, short dorsolateral to antennal base; area ventrolateral to antennal base with black pubescent spot. Antenna dark brown, antenna/ head length 2.2; scape length 0.20 mm, width 0.12 mm, length/width 1.7, scape/pedicel length 2.5, scape/flagellum width 0.67, setae dark reddish brown, short; pedicel length 0.08 mm, width 0.12 mm, length/width 0.67; flagellum length 1.10 mm, width 0.18 mm, length/width 6.1, flagellum/scape length 5.5. Maxillary palpus dark brown; setae white, elongate. Occipital setae white, elongate, absent dorsomedially, macrosetae absent.

Thorax. Macrosetae 2 np, 1 sa, 1 pa, 1 dc, 1 sc. Mesonotum dark reddish brown, pubescence gray; vittae appear as dull dark brown bands; setae white, short, erect intermixed with short, erect black setae. Pleurae dark reddish brown, pubescence white, anepimeron glossy; setae white over entire anepisternum and on laterotergite. Scutellum dark reddish brown, pubescence gray, setae absent. Wing. Length 3.8 mm, width 1.3 mm, length/width 2.9. Membrane hyaline; veins dark brown; pterostigma brown. Cell m3 open widely. Halter dark brown, white on ventral half of knob. Legs. Coxa dark reddish brown, pubescence white, dense; setae white; apical macrosetae dark reddish brown, not extending around anteroventral margin, anteromedial macroseta absent on forecoxa, posterolateral macroseta absent of hindcoxa. Femora, tibiae, and tarsi dark reddish brown.

Abdomen. Dark reddish brown, glossy, posterior margin of tergites 1–4 white; dorsal setae dark brown, short with white elongate setae dorsally on tergites 1–2 and across posterior margins of tergites 1–2; tergite and sternites lacking lanceolate setae. Terminalia . Epandrium ( Fig. 50 ) dark yellow, anterior margin truncate with lateral emargination; setae dark reddish brown. Hypoproct ventral view ( Fig. 50 ) attached laterally to sides of epandrium with aggregation of dark yellow setae in diagonal band. Hypandrium ( Fig. 51 ) glabrous. Gonocoxite ventral view ( Fig. 51 ) broadly rounded laterally, median margin deeply scalloped, apex truncate, lacking outer gonocoxal process, setae dark reddish brown. Gonostylus ( Fig. 52 ) tapered posterior with two curved projection; setae dark yellow. Aedeagus with dorsal apodeme ( Fig. 53 ) broad, tapered posteriorly; ventral apodeme ( Fig. 54 ) with anterior margin truncate; distiphallus ( Fig. 55 ) broad basally, tapered posteriorly in horizontal plane.

Redescription of female (MEI 155344)

The single female of Ataenogera minuta is similar to the male examined except for the following characters.

Body length 6.5 mm.

Head. Length 0.78 mm. Frons dark reddish brown, pubescence whitish gray with small, glossy, medial triangle. Frons ( Fig. 49 ). Antenna/head length 1.6; scape length 0.24 mm, width 0.12 mm, length/width 2.0, scape/pedicel length 3.0, scape/flagellum width 1.0; pedicel length 0.08 mm, width 0.12 mm, length/width 0.67; flagellum length 0.94, width 0.12 mm, length/width 7.8, flagellum/scape length 3.9.

Thorax. Macrosetae 2 np, 1 sa, 1 pa, 1 (fine) dc, 1 sc. Mesonotum with light covering of gray pubescence; setae black, short. Wing. Length 4.5 mm, width 1.6 mm, length/width 2.8. Membrane pale brown, becoming darker apically.

Abdomen. Dark reddish brown, glossy, tergites 1–5 with posterior margin whitish yellow; dorsal setae dark brown, short, white elongate laterally on tergite 1 and across posterior margins of tergites 1–3; sternites lacking dark brown lanceolate setae. Female terminalia not cleared.

Immature stages

Unknown.

Distribution. Ataenogera minuta is known from Peru ( Fig. 56 ).

Habitats and phenology. Ataenogera minuta has been collected in August.

Specimens examined. Type specimen. The holotype male of Ataenogera minuta Lyneborg is labeled " PERU: Apurimac, Cuzco-Abancay road, Apurimac crossing at Cuya, [-13.567, -72.591], 1,900m, 7.viii.1971, Malaise trap, C. & M. Vardy." (MEI 147915) and is in the BMNH (B.M. 1971-533). Other specimens. 1Ψ (MEI 155344) (BMNH), same data as holotype.

Figures

FIGURE 56. Distribution map; Ataenogera abdominalis (closed circle), A. grandis (open circle), A. irwini (closed square), A. minuta (asterisk).

FIGURES 48 – 55. Ataenogera minuta. 48. male frons. 49. female frons. 50. epandrium, cerci, hypoproct, ventral view. 51. hypandrium, gonocoxite, gonostylus, ventral view. 52. gonostylus, dorsal view. 53. aedeagus, dorsal view. 54. aedeagus, ventral view. 55. aedeagus, lateral view. organs. Scale = 0.1 mm.

FIGURES 1 – 9. Ataenogera abdominalis. 1. male frons. 2. female frons. 3. epandrium, cerci, hypoproct, ventral view. 4. hypandrium, gonocoxite, gonostylus, ventral view. 5. aedeagus, gonocoxite, gonostylus, dorsal view. 6. aedeagus dorsal view. 7. aedeagus ventral view. 8. aedeagus, lateral view. 9. female reproductive organs. Scale = 0.1 mm. Abbreviations: C = cercus, CSpD = common spermathecal duct, DA = dorsal apodeme, EA = ejaculatory apodeme, Epa = epandrium, F = furca, Gx = gonocoxite, GxA = gonocoxal apodeme, Gs = gonostylus, Hpt = hypoproct, H = hypandrium, Dp = distiphallus, Sp = spermatheca, VA = ventral apodeme.