Stenogephyra parkeri, Webb, Donald W. & Hauser, Martin, 2011

Webb, Donald W. & Hauser, Martin, 2011, Revision of the genus Stenogephyra Lyneborg (Diptera: Therevidae: Phycinae), Zootaxa 2837, pp. 67-85 : 79-81

Stenogephyra parkeri spec. nov.

( Figs. 10–11 , 32–35 , 44 )

Etymology. This species is named for Frank D. Parker, an avid and productive collector of therevids.

Diagnosis. Stenogephyra parkeri spec. nov. is similar to S. dianeae spec. nov. and S. minuta in possessing two pairs of notopleural macrosetae, in lacking dorsocentral macrosetae, in having the katepisternum completely covered with silver pubescence, and in having vein M2 reaching the hind margin of the wing. It differs from S. dianeae spec. nov. in having the silver pubescence along eye margin not greatly expanded at level of antennal base and not reaching height of frontal ocellus ( Fig. 10 ); halters dark brown; and the male gonocoxite lacking a posteroventral projection in lateral view (as in Fig. 24). It differs from S. minuta in having the head glossy with a narrow band of silver pubescence along margin of eyes ( Fig. 10 ) which broadens ventrally below level of eyes.

Description of male. Variation (n=10). Body length 3.2–4.5, 3.7 mm. Head. Length 0.54–0.64, 0.58 mm. Eyes separated by distance about two times width of ocellar tubercle. Frons ( Fig. 10 ) dark reddish brown, glossy with silver pubescence along margin of eye; setae black. Antenna dark brown; antenna/head length 1.8–2.3, 2.0; scape length 0.12–0.20, 0.16 mm, width 0.10–0.12, 0.11 mm, length/width 1.0–1.7, 1.4, scape/pedicel length 1.5–2.9, 2.3, scape/flagellum width 0.8–1.0, 0.9, setae dark brown; pedicel length 0.06–0.08, 0.07 mm, width 0.08–0.11, 0.08 mm, length/width 0.7–1.2, 0.9, setae dark brown, short; flagellum length 0.84–1.06, 0.94 mm, width 0.12– 0.14, 0.12 mm, length/width 7.2–9.0, 7.7, flagellum/scape length 5.3–7.7, 6.1. Parafacial ( Fig. 10 ) dark reddish brown, glossy with silver pubescence laterally along margin of eye and expanding ventrally, setae black, elongate. Maxillary palpus pale white (apex occasionally brown); length 0.20–0.26, 0.24 mm, width 0.04–0.08, 0.06 mm, length/width 3.0–5.0, 4.1; setae dark brown, elongate. Gena ( Figs. 10–11 ) broadly rounded, pubescence silver, dense; setae white, elongate. Occiput ( Fig. 11 ) dark reddish brown, glossy, pubescence silver along margin of eye; setae white, elongate. Thorax. Macrosetae 2 np, 0 dc. Mesonotum black, dorsocentral vitta present as gray pubescent band; setae black, short. Pleuron dark reddish brown, pubescence whitish gray, anepisternum and anepimeron glossy; setae white to pale yellow, elongate on anepisternum, katepisternum (1–2 dorsally), laterotergite, and black, short on scutellum. Wing. Membrane hyaline; length 2.5–3.5, 3.1 mm, width 1.0–1.2, 1.0 mm, length/width 2.5– 3.3, 3.0. M1 and M2 originate separately from discal cell, M2 reaching wing margin. Halter stalk and dorsal surface of knob dark brown, ventral surface of knob pale yellow. Legs. Dark reddish brown, concolorous, pubescence on coxae and femora white, dense. Abdomen. Dark reddish brown, glossy, tergites 1–4 with narrow, white posterior margin; dorsal setae black, short, appressed, lateral setae white, erect. Terminalia (MEI 124847) dark brown. Sternite 8 ( Fig. 32 ), posterior margin rounded; setae dark brown in broad band across posterior margin. Gonocoxite ventral view ( Fig. 32 ), quadrate, extending posterolaterally as narrow projection, setae brown; lateral view (as in Fig. 24), posteroventral projection absent. Aedeagus with distiphallus lateral view ( Fig. 33 ) thick, apex short, sinuate; ejaculatory apodeme lateral view ( Fig. 33 ) clavate anteriorly.

Female. Similar to male except for following. Variation (n=4). Body length 4.2–5.0, 4.6 mm. Head. Length 0.62–0.70, 0.66 mm. Antenna/head length 1.5–1.7, 1.6; scape length 0.16–0.20, 0.19 mm, width 0.09–0.10, 0.10 mm, length/width 1.6–2.0, 1.9, scape/pedicel length 2.3–2.9, 2.5, scape/flagellum width 0.9–1.3, 1.0; pedicel length 0.07–0.08, 0.75 mm, width 0.07–0.08, 0.08 mm, length/width 0.9–1.1, 1.0; flagellum length 0.72–0.80, 0.77 mm, width 0.08–0.10, 0.10 mm, length/width 7.4–9.0, 8.1, flagellum/scape length 3.6–4.6, 4.2. Maxillary palpus length 0.26 mm, width 0.06–0.07, 0.06 mm, length/width 3.7–4.3, 4.2. Thorax. Macrosetae 2 np, 0 dc. Wing. Length 3.3–4.0, 3.6 mm, width 1.0–1.3, 1.2 mm, length/width 2.8–3.7, 3.1. Abdomen. Terminalia (MEI 124838). Sternite 8 ( Fig. 34 ) oval, anterior margin constricted laterally. Furca ( Fig. 35 ) quadrate with narrow posterolateral projections; length 0.38 mm, width 0.22 mm.

Distribution. Stenogephyra parkeri spec. nov. is known from South Africa, Western Cape Province ( Fig. 44 ).

Habitats and Phenology. Stenogephyra parkeri spec. nov. has been collected in Malaise traps. Adults have been collected in November.

Specimens examined (n = 18). Type specimens. The holotype male of Stenogephyra parkeri spec. nov. (MEI 124842) is labeled “ SOUTH AFRICA: Western Cape, 24 km S Worcester @ hwy N1, 15/ 25-XI- 1999, 300m, malaise, ME Irwin, EI Schlinger, FD Parker, 200 m; 33º43.16’S 19º14.26’E ” and is deposited in NMSA. PARA- TYPES. SOUTH AFRICA. WESTERN CAPE PROVINCE. 24 km W Worcester at Highway N1 [-33.703, 19.238], 300m, 15-25.XI.1999, Irwin, M.E., Schlinger, E.I., Parker, F.D., 13ɗ MEI 124840–1 (INHS), 124843 (CSCA), 124844 (SAMC), 124845–53 (MEIC), 4Ψ 124836 (CSCA), 124837 (INHS), 124838 (NMSA), 124839 (MEIC), Malaise trap.

Figures

FIGURE 44. Stenogephyra spp. distribution. Open circle, S. dianeae spec. nov.; open square, S. janiceae spec. nov.; closed triangle, S. parkeri spec. nov.; closed circle, S. schlingeri spec. nov. FIGURE 45. Stenogephyra spp. distribution. Closed triangle, S. minuta; closed circle, S. namibiensis spec. nov.; open circle, S. torrida.

FIGURES 2 – 15. Stenogephyra sp. nov. 2 – 3. S. dianeae spec. nov.. 2. Head frontal view. 3. Head lateral view. 4 – 5. S. janiceae spec. nov.. 4. Head frontal view. 5. Head lateral view. 6 – 7. S. minuta. 6. Head frontal view. 7. Head lateral view. 8 – 9. S. namibiensis spec. nov.. 8. Head frontal view. 9. Head lateral view. 10 – 11. S. parkeri spec. nov. 10. Head frontal view. 11. Head lateral view. 12 – 13. S. schlingeri spec. nov. 12. Head frontal view. 13. Head lateral view. 14 – 15. S. torrida. 14. Head frontal view. 15. Head lateral view.

FIGURES 32 – 35. Stenogephyra parkeri spec. nov.. 32. Male sternite 8, gonocoxite ventral view. 33. Aedeagus, lateral view. 34. Female sternite 8. 35. Female furca. FIGURES 36 – 39. S. schlingeri spec. nov.. 36 Male sternite 8, gonocoxite ventral view. 37. Aedeagus, lateral view. 38. Female sternite 8. 39. Female furca. FIGURES 40. Stenogephyra sp., female terminalia. FIGURES 41 – 43 S. torrida, pupa ventral view. 41. Female. 42. Close-up of antennal sheath, lateral view. 43. Male terminal segments. Scale = 0.1 mm.