Encarsia imiza Li & Geng, 2017

Geng, Hui & Li, Cheng-De, 2017, Three new species of the Encarsia inaron (Hymenoptera: Aphelinidae) species group from China with a key to Chinese species, Zootaxa 4306 (2), pp. 208-222 : 215

Encarsia imiza Li & Geng , sp. nov.

Figs 18–23

Type material. Holotype ♀ [on slide, NEFU]: CHINA, Liaoning Province, Anshan City, Qianshan Mountains, Gudaoguan , 19–21.IX.2015, Hui Geng , Xin-Yu Zhang , Ye Chen , YPT.

Paratype. 1♀ [on slide, NEFU], CHINA, Liaoning Province, Fushun City, Yuanshuailin, 18.VI.2012, Hui Geng , Xiang-Xiang Jin , Jiang Liu , sweeping.

Diagnosis. Female. Length, mesosoma plus metasoma, 0.58–0.66 mm. Head ( Fig. 18 ) yellow with some brownish patches. Mesosoma ( Fig. 20 ) mainly yellowish-brown with some pale yellow or brown patches. Metasoma ( Fig. 20 ) pale yellow except petiole brown. Fore wing faintly infuscate behind submarginal and stigmal veins. Mid lobe of mesoscutum with 8 or 10 setae; placoid sensilla on scutellum moderately separated ( Fig. 20 ). Fore wing ( Fig. 21 ) 2.38–2.52× as long as wide, marginal fringe 0.23–0.25× as long as wing width. Mid tibial spur 0.57–0.61× as long as corresponding basitarsus. Ovipositor hardly exerted, 0.77–0.79× as long as mid tibia; third valvula 0.34× as long as second valvifer.

Description. Female. Holotype. Length, mesosoma plus metasoma, 0.58 mm. Head yellow except clypeus, malar sulcus, a spot on each side of occipital foramen, and postocellar bars brown. Antenna ( Fig. 19 ) pale yellow. Mesosoma yellowish-brown except side lobe pale yellow; pronotum, anterior margin of mid lobe, a patch on expanded part of each side lobe, inner sides of axillae, and propodeum brown. Wings ( Figs 21, 22 ) hyaline, fore wing with a faint infuscation behind submarginal and stigmal veins, veins pale brown. Legs yellow ( Fig. 23 ). Metasoma pale yellow except petiole brown.

Head ( Fig. 18 ) wider than mesosoma. Stemmaticum with transversely rugose sculpture. Mandible with two teeth and a truncation. Radicle (R), scape (S), pedicel (P) and 6 flagellomeres with the following ratios of length to width: R: 2.62, S: 4, P: 1.5, F1: 1.83, F2: 2.09, F3: 2.23, F4: 2.04, F5: 1.85 and F6: 1.92; relative lengths of R–F6 to length of F1: R: 1.03, S: 2.79, P: 1.03, F1: 1.00, F2: 1.33, F3: 1.42, F4: 1.48, F5: 1.45, and F6: 1.39; flagellomeres with the following numbers of longitudinal sensilla: F1: 0, F2: 1, F3: 2, F4: 3, F5: 3, F6: 3.

Mesosoma 0.79× as long as metasoma ( Fig. 20 ). Mid lobe of mesoscutum with 8 setae, each side lobe of mesoscutum with 3 setae. Distance between placoid sensilla on scutellum 4.89× maximum width of a sensillum. Distance between anterior pair of scutellar setae equal to distance between posterior pair. Fore wing ( Fig. 21 ) 2.52× as long as wide, costal cell with 7 short setae, basal cell with 10 setae, marginal vein with 6 setae along anterior margin; marginal fringe 0.25× as long as wing width. Mid tibial spur 0.57× as long as corresponding basitarsus, and the latter 0.37× as long as mid tibia. Hind tibia 0.96× as long as mid tibia.

Metasoma ( Fig. 20 ) with petiole distinctly sculptured. T2–T7 with 1+1, 1+1, 1+1, 6, 1+4+1 (4 between cercal plates) and 4 setae, respectively. Ovipositor slightly exerted, apparently originating from base of T4, 0.79× as long as mid tibia, and 0.58× as long as mid tibia and basitarsus combined. Third valvula 0.34× as long as second valvifer.

Male. Unknown.

Host. Unknown.

Variation. Sole paratype more infuscate on metasoma: T1 anteriorly, T5 completely, and T6 anteriorly brown; mid lobe of mesoscutum with 10 setae.

Etymology. The specific name is an anagram of azimi , a similar species in this genus.

Comments. Encarsia imiza resembles E. azimi Hayat in having similar body colour and the presence of internal sculpture in the cells forming the reticulation on the thoracic dorsum, but can be separated from the latter by the following characters: occiput largely yellow except for a brownish patch on each side of foramen (vs occiput completely brownish); mesosoma largely brownish-yellow (vs brown); all legs yellowish (vs fore and hind coxae brown basally); ovipositor 0.56–0.58× as long as mid tibia and basitarsus combined (vs 0.76×); gaster pale yellow (vs pale yellow with T1 across base dark brown).

Figures

FIGURES 18 – 23. Encarsia imiza, holotype ♀: 18, head, frontal view; 19, antenna; 20, mesosoma and metasoma; 21, fore wing; 22, hind wing; 23, legs. Scale bars = 50 µm.