Ataenogera grandis 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 : 57-59

Ataenogera grandis Lyneborg

( Figs. 30–38 , 56 )

grandis Lyneborg (2002:104, fem. desc., key; 2002:105, Figs.1–2 fem. ant., max. palp.) ( Ataenogera ). Type locality Brazil, Itatiaya. Holotype female in USNM by original designation.

Diagnosis. Ataenogera grandis shares with A. argentifrons , A. irwini , and A. minuta the absence of lanceolate setae on the male and female abdomens. It differs from A. argentifrons in having the frons ( Figs. 30–31 ) convergent dorsally, dark reddish brown, glossy, pubescence gray ventral to ocellar tubercle and white, dense dorsal and ventral to antennal bases with setae dorsolateral to the antennal bases; the coxal macrosetae dark reddish brown; the male gonocoxite lacking a pair of large falcate projections posterolaterally and having the anterior margin of the female furca ( Fig. 38 ) open. It differs from A. irwini in having the anepisternum covered with gray pubescence and with setae over the entire anepisternum. It differs from A. minuta in being much larger; possessing two pairs of dorsocentral macrosetae; and the male distiphallus ( Fig. 37 ) with a large dorsal carina.

Description of male

Variation (n=2)

Body length 8.2–8.4, 8.3 mm.

Head. Head length 0.74–0.76, 0.75 mm. Eyes dichoptic ( Fig. 30 ) separated by distance equal to width of ocellar tubercle; ommatidia of equal size. Frons ( Fig. 30 ) convergent dorsally, dark reddish brown, glossy, pubescence gray ventral to ocellar tubercle and white, dense dorsal and ventral to antennal bases; setae white, short dorsolateral to antennal base; area lateral to antennal bases lacking black pubescent band or spot. Antenna dark brown, pubescence light gray on scape and pedicel, antenna/head length 1.7; scape cylindrical, length 0.24–0.30, 0.27 mm, width 0.12 mm, length/width 2.0–2.5, 2.25, scape/pedicel length 2.4–3.0, 2.7, scape/flagellum width 0.86, setae dark reddish brown, short, macrosetae dark reddish brown; pedicel length 0.10 mm, width 0.12–0.14, 0.13 mm, length/width 0.71; flagellum length 0.92 mm, width 0.14 mm, length/ width 6.6, flagellum/scape length 3.8. Maxillary palpus dark reddish brown; setae white. Occipital setae white, absent dorsomedially but extending across dorsal margin of occiput, macrosetae absent.

Thorax. Macrosetae 2 np, 1 sa, 1 pa, 2 dc, 1 sc. Mesonotum black, glossy; vittae indistinct; setae white, short, erect and suberect. Pleurae dark reddish brown, pubescence white, anepimeron glossy; setae white over entire anepisternum and laterotergite. Scutellum dark reddish brown, glossy; setae absent. Wing. Length 5.3– 5.5, 5.4 mm, width 1.7–2.0, 1.85 mm, length/width 2.7–3.2, 2.95. Membrane hyaline; veins dark brown; pterostigma dark brown. Cell m3 closed, petiolate. Halter dark brown. 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, midfemora paler.

Abdomen. Dark reddish brown, glossy, posterior margin white on tergites 1–6; dorsal setae dark brown, short with white elongate setae dorsally on tergites 1–2 and across posterior margins of tergites 1–4; tergite 7 and sternites 5–8 lacking lanceolate setae. Terminalia (MEI 147884). Epandrium ( Fig. 32 ), anterior margin truncate with median emargination; setae dark reddish brown. Hypoproct ventral view ( Fig. 32 ) attached laterally to sides of epandrium; setae yellow, scattered. Hypandrium ( Fig. 33 ) glabrous. Gonocoxite ( Fig. 33 ) rectangular, sides broadly rounded, posterolateral corner short, not extended posteriorly as outer gonocoxal process, setae brown. Gonostylus dorsal view ( Fig. 34 ) broad with two falcate projections. Aedeagus with dorsal apodeme ( Fig. 35 ), oval; ventral apodeme ( Fig. 36 ) broad, rounded anteriorly; distiphallus dorsal view ( Fig. 35 ) with narrow dorsal carina, lateral view ( Fig. 37 ) sinuate with large dorsal carina.

Redescription of female

Similar to male except for following. Variation (n=3).

Body Length 9.6–10.5, 10.0 mm.

Head. Length 0.96–1.02, 1.00 mm. Eyes ( Fig. 31 ) separated by distance greater than width of ocellar tubercle. Frons ( Fig. 31 ) glossy, pubescence whitish gray, dense dorsal and ventral to base of antenna and with an area of gray pubescence ventrolateral to ocellar tubercle; setae sparse. Antenna/head length 1.7–1.9, 1.8; scape length 0.24–0.28, 0.26 mm, width 0.16–0.19, 0.18 mm, length/width 1.4–1.6, 1.5, scape/pedicel length 2.4–2.8, 2.6, scape/flagellum width 1.0–1.2, 1.1; pedicel length 0.10 mm, width 0.16–0.18, 0.17 mm, length/ width 0.56–0.63, 0.60; flagellum length 1.38–1.60, 1.49, width 0.16 mm, length/width 8.6–10.0, 9.3, flagellum/scape length 5.8–6.2, 6.0.

Thorax. Macrosetae 2 np, 1 sa, 1 pa, 2 dc, 1 sc. Mesonotum with light covering of gray pubescence; setae black, short. Anepisternum dark reddish brown, glossy with medial dorsoventral band of white pubescence. Wing. Length 8.8 mm, width 2.3–2.6, 2.5 mm, length/width 3.4–3.8, 3.6. Membrane pale brown, becoming darker apically. Legs. Femora dark reddish brown to black.

Abdomen. Dark reddish brown, glossy, tergites 1–3 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 5–7 lacking dark brown lanceolate setae. Terminalia (MEI 155341). Furca ( Fig. 38 ) broadly triangular, anterior margin open; length 0.50 mm, width 0.44 mm.

Immature stages

Unknown.

Distribution. Ataenogera grandis is known from Brazil ( Fig. 56 ).

Habitats and phenology. Ataenogera grandis has been handnetted or collected in a Malaise trap in January, February, July, August, October, and December.

Specimens examined. Type specimen. The holotype female of Ataenogera grandis Lyneborg is labeled "Itatiaya– 700m, E. Rio- Brazil, 7.i.1934, J. F. Zikán" (MEI 147914) and is in the USNM. Other specimens. AMAZONAS. Parque Nacional Jau [-1.895, -61.586], 29.VII–08.VIII.2001, Henriques, Vidal, 1♂ MEI 147878 (INHS). RIO de JANEIRO. Itatiaya [-22.5, -44.571], 16.I.1939, J. F. Zikán, 1Ψ MEI 155341 (USNM); 6. II.1940, 1 Ψ MEI 155345 (USNM); 24. I.1945, 1 Ψ MEI 155342 (USNM); 26. XII.1948, 1 Ψ MEI 155343 (USNM). RONDONIA. Guajara-Mirim, Rio Ouro Preto, Bananal [-10.973, -65.094], 20-27.X.1995, Rafael, J. A., Henriques, A. L., 1♂ MEI 147884 (INPA), Malaise.

Figures

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

FIGURES 30 – 38. Ataenogera grandis. 30. male frons. 31. female frons. 32. epandrium, cerci, hypoproct, ventral view. 33. hypandrium, gonocoxite, gonostylus, ventral view. 34. gonostylus, dorsal view. 35. aedeagus, dorsal view. 36. aedeagus, ventral view. 37. aedeagus, lateral view. 38. female reproductive 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.