Pennaticoxita tauricornuta Jiao & Bu, 2016

Jiao, Kelong, Han, Peijin, Wang, Yuanhong & Bu, Wenjun, 2016, General review of the tribe Brachineurini (Diptera: Cecidomyiidae) with description of Pennaticoxita tauricornuta gen. & sp. nov. from China, Zoological Systematics 41 (3), pp. 307-314 : 311-313

Pennaticoxita tauricornuta Jiao & Bu , sp. nov.

Diagnosis. The species is different from other species of the tribe Brachineurini by the aedeagus dorsally with a pair of horn-shaped prominences on the sub-apex, and each prominence approximately as long as gonostylus.

Description. Adult. Body colour yellow brown, length 1.00– 1.10 mm (n = 6). Wing length (measured from the base) 1.40–1.50 mm (n = 6), width 0.50–0.60 mm (n = 6).

Head ( Figs 1–2 ). Eye bridge 8 facets long in the middle of vertex. Palpus sparsely setose, with palpiger and 3 segments, last two segments longer than first one ( Fig. 1 ). Antenna with 10 flagellomeres; pedicel subglobular, smaller than scape, both densely covered with setae ventrally; node of all flagellomeres subcylindrical, a little broadened subbasally, neck of all flagellomeres a little shorter; each node with 2 horizontal, appressed, band-shaped circumfila, subapically and subbasally respectively linked by two similar longitudinal circumfila, and 2 whorls of long, strong and irregular setae, one subbasal and one subapical; first and second flagellomeres fused; third male flagellomere ( Fig. 2 ) with the node 1.30–1.40 times as long as wide and the neck 4.10–4.20 times as long as wide, 0.90–0.95 times length of node.

Thorax ( Figs 3–4 ). Wing ( Fig. 3 ) hyaline, 2.45–2.50 times as long as wide. Vein Sc weak, C, R 1 and R 5 strong; vein R 1 joining vein C at basal 2/5, with one pore near the distal; vein R 5 bent a little backward, joining vein C at wing apex, with one pore at basal 1/3; vein Cu not forked and bent backward, vein CuP parallel with Cu. Legs densely covered with narrow scales and sparse setae. Tarsal claw ( Fig. 4 ) toothed on all legs; empodium shorter than tarsal claw; pulvillus cylindrical.

Abdomen. Each tergite and sternite densely covered uniformly with scales. First through sixth tergites developed and strip-shaped, with an irregular but mostly single, posterior row of setae, with several pairs of lateral setae, and with one anterior of trichoid sensilla; first tergite much shorter than second tergite; seventh and eighth tergites both reduced to one strongly sclerotized, latitudinal and linear band with several scattered setae; second through eighth sternites covered with many scattered lateral and central setae, with one anterior pair of closely set trichoid sensilla; second sternite divided latitudinally into two bands, respectively with one single, anterior row of setae and one single, posterior row of setae; third through seventh sternites sub-rectangular with an irregular but mostly single, posterior row of setae; seventh sternite shorter than sixth; eighth sternite crescent, much shorter and much narrower than seventh.

Male genitalia ( Figs 5–6 ). Gonocoxite much slender, having a wing-shaped dorsal lobe approximately as long as 3/4 length of gonocoxite, and having mediobasal lobes undeveloped, only with four closely set setae, all inserted in a sub-frustoconical prominence; gonostylus slender, gradually tapered from base to apex, approximately as long as 3/5 length of gonocoxite, covered with a few setae and dense microtrichiae, with a short setae located apically on the inner side, toothed apically; cerci separated deeply and widely with a U-shaped depression forming two broad, semicircular lobes with a few long lateral setae; hypoproct a little longer than cerci, emarginated widely with a U-shaped depression forming two digitiform lobes; aedeagus sub-conical, approximately half the length of gonocoxite, dorsally with a pair of horn-shaped prominences on the sub-apex, each prominence approximately as long as gonostylus and covered with long setae.

Female genitalia. Unknown.

Holotype ♂. China, Guangxi, Shangsi, Nanping, Milü (21.55°N, 107.43°E; elev. 770 m), 3–5.IV.2002, leg. Huaijun Xue, Malaise trap (NKUCecid. No. BCA001) . Paratypes. 2♂, same data as holotype (NKUCecid. No. BCA002–003) ; 2♂, China, Yunnan, Jingdong, Wuliang Mountain, Manwan (24.4°N, 100.8°E; elev. 1150 m), 30–31. V .2001, leg. Jun Li, Malaise trap (NKUCecid. No. BCA004-005); 1♂, 28–29. V .2001, ibid., (elev. 1200 m; NKUCecid. No. BCA006). All type specimens are deposited in NKUM .

Distribution. China (Guangxi, Yunnan)

Etymology. The species name tauricornuta means the aedeagus dorsally with a pair of horn-shaped prominences on the sub-apex.

Figures

Figures 1–4. Pennaticoxita tauricornuta gen. & sp. nov., male. 1. Palpus, lateral view. 2. Third flagellomere, dorsal view. 3. Wing, dorsal view. 4. Fore acropod, lateral view. Scale bars: 1–2, 4=20μm; 3 =200μm.

Figures 5–6. Pennaticoxita tauricornuta gen. & sp. nov., male. 5. Genitalia, ventral view, one gonopod, cerci and hypoproct removed. 6. Genitalia, dorsal view, one gonopod removed. Scale bars=50μm.