Ammothereva flavifemorata, Liu, Si-Pei, Gaimari, Stephen D. & Yang, Ding, 2012

Liu, Si-Pei, Gaimari, Stephen D. & Yang, Ding, 2012, Species of Ammothereva Lyneborg, 1984 (Diptera: Therevidae: Therevinae: Cyclotelini) from China, Zootaxa 3566, pp. 1-13 : 6-7

Ammothereva flavifemorata sp. nov.

( Figs. 12–22 , 35 )

Diagnosis. Antenna with apical part of first flagellomere and style dark brown. Macrosetae on thorax pale yellow. Legs entirely yellow. Tibiae with mixed pale and black setae. Abdomen mostly black with pale pruinescence. Aedeagus with dorsal apodeme narrow, lateral ejaculatory apodeme narrow and not extending beyond edge of dorsal apodeme, distiphallus long and slender.

Description. Male. Body length 4.2–6.5 mm, wing length 3.8–5.5 mm.

Head ( Fig. 12 ) with dense pale pruinescence over black ground color; frons with light brown pruinescence. White pile from gena to occiput, upper occiput with some pale yellow postocular setae; ocellar tubercle, frons and parafacial bare. Eyes nearly contiguous on upper frons. Antenna ( Fig. 13 ) yellow with pale pruinescence, except apex of first flagellomere and entire style dark brown; scape and pedicel with pale yellow pile, several strong black setae on apical scape and basal first flagellomere; scape conical; pedicel ovoid; first flagellomere swollen basally, wider than scape and pedicel; style apical with tiny distal spine; antennal ratio 2.3: 1.0: 4.3: 1.1. Proboscis pale yellow with short yellow pile; palpus pale yellow with white pile.

Thorax with dense pale pruinescence over black ground color. White pile on marginal notum and pleuron; prosternum bare; macrosetae on thorax pale yellow. Scutal chaetotaxy (pairs): np 3, sa 2, pc 1, dc 1, sc 2. Legs entirely yellow; pulvilli yellow. Coxae and femora with white pile and pale yellow setae, but several setae on apical femora black; posterior surface of mid coxa bare; tibiae with pale yellow setae mixed with several black setae; tarsi with black setae. Fore coxa with a 1, av 1; mid coxa with a 2; hind coxa with a 1–3, d 1. Fore femur with av 1; mid femur with av 1, pv 2; hind femur with av 3–4, pv 1. Fore tibia with ad 1–2, pd 0–3, pv 3–4, apically with 5–6 setae; mid tibia with ad 3, pd 2, av 2, pv 3–4, apically with 5–6 setae; hind tibia with ad 8, pd 5–7, av 6–8, pv 4–5, apically with 8–9 setae. Wing hyaline, tinged yellow; pterostigma very narrow, yellow, at the end of R1; veins brown; cell m3 closed with short petiole apically. Halter stalk yellow, knob pale yellow.

Abdomen with pale pruinescence; covered with white pile; tergites black in ground color except posterior corners of each tergite yellow, sternites yellow except basal area of each sternite black, posterior margin of each segment pale yellow. Male genitalia: Epandrium ( Fig. 19 ) nearly as long as wide, basal and distal margins each with triangular medial invagination. Subepandrial sclerite with small medial invagination; nearly as long as cercus distally. Hypandrium short. Gonocoxite ( Fig. 20 ) tapering posteriorly into short outer gonocoxal process. Gonostylus much elongated, nearly 8 times longer than wide. Aedeagus ( Fig. 21 ) with dorsal apodeme narrow; lateral ejaculatory apodeme narrow; distiphallus ( Fig. 22 ) ventrally curved.

Female. Unknown.

Type material. Holotype male, CHINA: Gansu, Sunan, Lama Plain (38°50'N, 99°37'E, 2158 m), 6. VII. 2011, Xiao Zhang. Paratypes, CHINA: 1 3, Ningxia, Helan Mountain (38°34'N, 106°20'E), 21. VII. 1980, Chi-Kun Yang; 1 3, Gansu, Sunan, Lama Plain (38°50'N, 99°37'E, 2158 m), 6. VII. 2011, Ya-Jun Zhu.

Distribution. Palaearctic: China (Gansu, Ningxia) ( Fig. 35 ). This is biogeographically part of the Mongolia- Xinjiang and North China Regions ( Zhang 1999).

Remarks. This new species is very similar to A. laticornis ( Loew, 1856) , especially in the external habitus, the lateral view of the gonocoxite and even the aedeagus. But it can be separated from it by the following features: epandrium as long as wide, parallel-sided and markedly emarginated distally and basally; subepandrial sclerite as long as cercus; lateral ejaculatory apodeme narrow, not extending beyond margin of dorsal apodeme. In A. laticornis , the epandrium ( Gaimari & Irwin 2000: 221, fig. 56) is 1.3 times longer than wide, tapering distally and not emarginated basally; the subepandrial sclerite is distinctly longer than the cercus; and the lateral ejaculatory apodeme ( Lyneborg 1984: 214, fig. 29) extends laterally beyond the edge of the dorsal apodeme.

Etymology. The specific name refers to the entirely yellow legs, from the Latin adjective “flavus” meaning yellow and the Latin derivation “femorata” referring to the legs.

Figures

FIGURE 35. Distribution of Ammothereva species in China.

FIGURES 12 – 15. External morphology of male Ammothereva flavifemorata sp. nov. 12. head, frontal view; 13. head, lateral view; 14. habitus, lateral view; 15. habitus, dorsal view.

FIGURES 16 – 22. Male genital morphology of Ammothereva flavifemorata sp. nov. 16. terminalia, lateral view; 17. tergite 8; 18. sternite 8; 19. epandrial complex, dorsal view; 20. gonocoxal complex, dorsal view; 21. aedeagus, ventral view; 22. aedeagus, lateral view. Scale: 0.2 mm.