Encarsia huangi Li & Geng

Geng, Hui & Li, Cheng-De, 2016, Five new species of genus Encarsia Förster from China (Hymenoptera: Aphelinidae), Zootaxa 4162 (3), pp. 535-549 : 544-546

Encarsia huangi Li & Geng , sp. nov.

Figs 23–30

Type material. Holotype. ♀ [on slide], ( NEFU), CHINA, Yunnan Province, Xishuangbanna, Mengla County, Menglun Town , Nanxing , 13. II. 2014, Guo-Hao Zu , Zhong-Ping Xiong , sweeping.

Diagnosis. Female. Length, mesosoma plus metasoma, 0.45 mm. Frontovertex 0.59× as broad as head width; ocelli forming about an obtuse triangle. Mandible with two teeth and a truncation; maxillary and labial palpi 1- segmented. Antennal formula 1:1:3:3. F1 and F2 without longitudinal sensilla. Mid lobe of mesoscutum with 4 setae; each side lobe with 2 setae; axilla with 1 seta; placoid sensilla on scutellum narrowly separated; distance between anterior pair of scutellar setae distinctly shorter than that between posterior pair. Fore wing 3.57× as long as wide, sparsely setose, with two large asetose areas, one around stigmal vein and the other at apex of wing disc; marginal fringe about as long as wing width; basal cell asetose. Tarsal formula 5:5:5. Mid tibial spur 0.83× as long as corresponding basitarsus. Petiole finely sculptured. T7 1.83× as wide as long. Ovipositor not exerted, 0.82× as long as mid tibia; third valvula 0.4× as long as second valvifer.

Description. Female. Holotype. Length, mesosoma plus metasoma, 0.45 mm. Head and body ( Fig. 28 ) including legs almost entirely pale yellow, but antennal clava a little darker and distal part of ovipositor stylet brownish. Wings mostly hyaline, except below marginal vein narrowly and apical wing margin very narrowly infuscate, venation brown.

Head ( Fig. 23 ), in frontal view, 1.56× as wide as high, and about as wide as mesosoma. Frontovertex 0.59× as broad as head width. Eyes with fine and transparent setae. Ocelli forming about an obtuse triangle. Mandible with two teeth and a truncation. Maxillary and labial palpi 1-segmented. Antennae inserted at level of lower margin of eyes. Antennal formula, 1:1:3:3 ( Fig. 24 ); radicle (R), scape (S), pedicel (P), 3 funicle segments (F1–F3) and 3 club segments (F4–F6) with the following ratios of length to width: R: 2.13, S: 3.25, P: 1.60, F1: 1.33, F2: 1.54, F3: 1.50, F4: 1.52, F5: 1.40 and F6: 1.68; relative lengths of segments R–F6 to length of F1: R: 1.25, S: 3.25, P: 1.50, F1: 1.00, F2: 1.25, F3: 1.50, F4: 1.75, F5: 1.75, and F6: 2.00; flagellum with the following numbers of longitudinal sensilla: F1: 0, F2: 0, F3: 1, F4: 3, F5: 3, F6: 3.

Mesosoma ( Fig. 25 ) 0.64× as long as metasoma. Mid lobe of mesoscutum and axillae weakly reticulate. Mid lobe of mesoscutum with 4 setae, each side lobe of mesoscutum with 2 setae. Axilla with 1 short seta. Scutellum 2.48× as wide as long, and 0.53× as long as mid lobe of mesoscutum. Placoid sensilla on scutellum separated slightly, by less than own maximum width. Anterior pair of scutellar setae clearly shorter than posterior pair, and distance between anterior pair 0.52× that between posterior pair. Endophragma long and rounded at apex, extending to posterior margin of T2. Fore wing ( Fig. 26 ) 3.57× as long as wide, sparsely setose, with two large asetose areas, one around stigmal vein and the other at apex of wing disc; costal cell with 4 short setae in basal half; basal cell asetose; submarginal vein with 2 setae; marginal vein 1.38× as long as submarginal vein, with 5 setae along anterior margin; marginal fringe as long as wing width. Tarsal formula 5:5:5. Mid tibial spur 0.83× as long as corresponding basitarsus ( Fig. 27 ), and the latter 0.28× as long as mid tibia. Hind tibia 0.93× as long as mid tibia.

Metasoma ( Fig. 28 ) with petiole ( Fig. 29 ) finely sculptured. T1–T5 with scale-like reticulation laterally. T2–T7 with 1+1, 1+1, 1+1, 2+2, 1+2+1 and 4 setae, respectively. T7 1.83× as wide as long. Ovipositor ( Fig. 30 ) not exerted, apparently originating from posterior margin of T4, 0.82× as long as mid tibia, and 0.64× as long as mid tibia and basitarsus combined. Third valvula 0.40× as long as second valvifer.

Male. Unknown.

Host. Unknown.

Etymology. This species is named in honor of Prof. Huang Jian (Plant Protection College of Fujian Agriculture and Forestry University, China) for his contributions to the study of Hymenoptera , Aphelinidae .

Comments. This new species is placed in the E. citrina- group ( Viggiani & Mazzone 1979; Hayat 1989) based on the shape of the fore wing, longer marginal fringe, presence of an asetose area around the stigmal vein, mid lobe of mesoscutum with 4 setae, petiole with fine sculpture, submarginal vein with 2 setae, and mid tarsi 5-segmented, but differs from all the other species of this group ( citrina , lounsburyi , curtifuniculata , gracilens ,?flava,?fusca,?latipennis) mainly by the narrowly separated placoid sensilla on the scutellum, and entirely pale yellow body. Further differences are listed in the key.

Figures

FIGURES 23 – 30. Encarsia huangi sp. nov., holotype ♀: 23, head, frontal view; 24, antenna; 25, mesosoma; 26, fore wing with stigmal vein enlarged; 27, mid tibial spur and tarsi; 28, mesosoma and metasoma; 29, sculpture on petiole; 30, ovipositor. Scale bars = 50 µm.