Ataenogera irwini, Hauser, Martin & Webb, Donald W., 2007

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 : 59-62

Ataenogera irwini sp. nov.

( Figs. 39–47 , 56 )

Etymology. This species is named for M. E. Irwin who collected this species in Peru.

Diagnosis. Ataenogera irwini is similar to A. argentifrons , A. grandis , and A. minuta in lacking lanceolate setae on the male and female abdomens. It differs from A. argentifrons in having the frons convergent dorsally ( Figs. 39–40 ) with setae present dorsolateral to the antennal bases; the anepisternum glossy with gray pubescence and setae on dorsal fourth; the coxal macrosetae dark reddish brown; the male gonocoxite lacking a pair of large falcate projections posterolaterally; and the female furca ( Fig. 47 ) lacking a broad anterolateral projection. It differs from A. grandis in having the anepisternum glossy with gray pubescence and setae on dorsal fourth; in lacking dorsocentral macrosetae; in having the male distiphallus ( Fig. 44 ) lacking a dorsal carina; and the female furca ( Fig. 47 ) closed anteriorly. It differs from A. minuta in having the anepisternum glossy with gray pubescence and setae on dorsal fourth; in lacking dorsocentral macrosetae; and the male gonostylus ( Fig. 43 ) lacking two curved dorsal projections.

Description of male

Variation (n=10).

Body length 5.5–6.7, 6.0 mm.

Head. Head length 0.70–0.76, 0.68 mm. Eyes ( Fig. 39 ) dark reddish brown; dichoptic, separated by width of ocellar tubercle; ommatidia smaller dorsally and dorsolaterally. Frons ( Fig. 39 ) dark reddish brown, pubescence white, dense dorsal to antennal bases, gray on dorsal half with glossy triangle ventromedially; setae white, short dorsolateral to antennal base; area lateral to antennal bases lacking black pubescent spot. Antenna dark brown, antenna/head length 1.5–2.3, 1.9; scape length 0.30–0.42, 0.35 mm, width 0.09–0.012, 0.10 mm, length/width 3.0–4.7, 3.5, scape/pedicel length 3.0–4.9, 3.7, scape/flagellum width 0.68–0.86, 0.81, setae dark reddish brown, short, macrosetae dark reddish brown; pedicel length 0.07–0.10, 0.09 mm, width 0.12–0.13, 0.12 mm, length/width 0.67–0.84, 0.80, setae dark reddish brown, short; flagellum length 0.64–0.90, 0.82 mm, width 0.12–0.14, 0.12 mm; length/width 4.9–7.5, 6.7, flagellum/scape length 1.9–2.6, 2.4. Maxillary palpus dark brown; setae white. Occipital setae white, sparse dorsally, macrosetae absent. Postocular macrosetae dark reddish brown, in single row.

Thorax. Macrosetae 2 np, 1 sa, 1 pa, 0 dc, 1 sc. Mesonotum black, pubescence gray; vittae outlined by gray pubescence; setae white, short, erect. Pleurae dark reddish brown, pubescence gray with ventral twothirds of anepisternum and anterior fourth of anepimeron glossy; setae white on dorsal fourth of anepisternum and on laterotergite. Scutellum dark reddish brown, pubescence gray; setae absent. Wing. Length 4.0–4.7, 4.3 mm, width 1.0–1.5, 1.2 mm, length/width 3.0–4.2, 3.5. Membrane pale smoky brown becoming darker apically; veins dark brown; pterostigma dark brown. Cell m3 open widely. Halter dark brown, ventral half of knob white. Legs. Coxa dark reddish brown, pubescence white; setae white; apical macrosetae dark reddish brown, not extending around anteroventral margin, anteromedial macroseta absent on forecoxa, hindcoxa with one posterolateral macroseta. Femora, tibiae, and tarsi dark reddish brown to black.

Abdomen. Dark reddish brown, glossy, posterior margin of tergites 1–4 and 6 whitish yellow; dorsal setae dark brown, short with white elongate setae dorsally on tergites 1–2 and across posterior margins of tergites 1–4; tergites and sternites lacking lanceolate setae. Terminalia (MEI 170101). Epandrium ( Fig. 41 ) truncate anteriorly with small lateral emargination; setae dark yellow. Hypoproct ventral view ( Fig. 41 ) attached laterally to sides of epandrium; setae dark yellow. Hypandrium ( Fig. 42 ) glabrous. Gonocoxite ventral view ( Fig. 42 ) rectangular; outer gonocoxal process short, extending slightly beyond posterior margin of gonocoxite; setae brown. Gonostylus ( Fig. 43 ) flattened dorsoventrally with broad lateral lobe and dorsal ridge; setae yellow. Aedeagus with dorsal apodeme ( Fig. 44 ) oval; ventral apodeme ( Fig. 45 ) bifurcate, anterior margin broadly emarginate; distiphallus ( Fig. 46 ) broadly curved ventrally.

Female

The single female of Ataenogera irwini , sp. nov. is similar to the males examined except for the following characters.

Body length 6.5 mm.

Head. Length 0.82 mm.

Frons ( Fig. 40 ), setae dark brown dorsolateral to antennal base. Antenna/head length 1.6; scape length 0.36 mm, width 0.12 mm, length/width 3.0, scape/pedicel length 3.6, scape/flagellum width 1.2; pedicel globular, length 0.10 mm, width 0.12 mm, length/width 0.83; flagellum length 0.84, width 0.10 mm, length/width 8.4, flagellum/scape length 2.3.

Thorax. Macrosetae 2 np, 1 sa, 1 pa, 0 dc, 1 sc. Mesonotum with light covering of gray pubescence; setae black, short. Wing. Length 5.5 mm, width 1.5 mm, length/width 3.7.

Abdomen. Dark reddish brown, glossy, posterior margin of tergites 1–4 and 6 whitish yellow; dorsal setae dark brown, short with white elongate setae dorsally on tergites 1–2 and across posterior margins of tergites 1–4; tergites and sternites lacking lanceolate setae. Terminalia (MEI 174548). Furca ( Fig. 47 ) globular, anterior margin closed; length 0.31 mm, width 0.31 mm.

Immature stages

Unknown.

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

Habitats and phenology. Ataenogera irwini has been collected in Malaise traps in hillside ravines and deep washes set in sclerophyl vegetation during March and December.

Specimens examined. Type specimens. The holotype male of Ataenogera irwini sp. nov. is labeled " Peru, Depto Amazonas, 7 km W Bagua Grande, at Km 216; 14–17.XII.2005, Irwin, M. E.; 560m; 5°43.03’ S.

78°31.59’ W " (MEI 170105) and is deposited in CAS (Type No. 18238). PARATYPES. PERU. AMAZONAS. 7 km W Bagua Grande, at Km 216 [-5.7172, -78.5265], 14–17.XII.2005, MEI, 5♂ MEI 170101 (CSCA), 170102 (INHS), 170012 (USNM), 170104 (BMNH), 170106 (CNC), Malaise trap across hillside ravine in sclerophyl vegetation; 7 km E Chamaya, km 189 Bagua road marker [-5.7913, -78.726], 500 m, 8– 24.III.2005, MEI, G. Anton, A, 1♂ MEI 174550 (MEIC), Malaise in dry wash with sclerophyl vegetation; 8 km W Bagua Grande, km 216 on Bagua Road, [-5.717, -78.528], 530 m, 8–31.III.2005, Malaise trap, MEI, G. Anton A., 3♂ MEI 174551–3 (MEIC), 1Ψ 174548 (INHS). CAJAMARCA. 10 km N Jaén [-5.6392, -78.7497], 500m, 15–16.XII. 2005], MEI, 3♂ MEI 170098–100 (MEIC), Malaise in deep wash in lush tropical vegetation.

Figures

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

FIGURES 39 – 47. Ataenogera irwini. 39. male frons. 40. female frons. 41. epandrium, cerci, hypoproct, ventral view. 42. hypandrium, gonocoxite, gonostylus, ventral view. 43. gonostylus, dorsal view. 44. aedeagus, dorsal view. 45. aedeagus, ventral view. 46. aedeagus, lateral view. 47. female reproductive organs. Scale = 0.1 mm.