Encarsia polymacula 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 : 219

Encarsia polymacula Li & Geng , sp. nov.

Figs 31–38

Type material. Holotype ♀ [on slide, NEFU]: CHINA, Liaoning Province, Huludao City, Jianchang County, 4.VII.2012, Si-Zhu Liu , Jiang Liu , sweeping.

Diagnosis. Female. Length, mesosoma plus metasoma, 0.63 mm. Head (Fig. 31) yellow except clypeus, malar sulcus, a patch on each side of occipital foramen and postocellar bars brown. Mesosoma ( Fig. 33 ) largely yellow with some brown to dark brown patches. Metasoma ( Fig. 33 ) dark yellow with petiole, T1 anteriorly, sides of T1– T4 brown, T5 and T6 largely brown with middle part paler. Mid lobe of mesoscutum ( Fig.34 ) with 11 setae; placoid sensilla on scutellum moderately separated. Fore wing ( Fig. 35 ) 2.5× as long as wide, marginal fringe 0.24× as long as wing width. Mid tibial spur 0.42× as long as corresponding basitarsus ( Fig. 37 ). Petiole with distinct reticulate sculpture ( Fig. 38 ). Ovipositor slightly exerted, 0.77× as long as mid tibia; third valvula 0.4× as long as second valvifer.

Description. Female. Holotype. Length, mesosoma plus metasoma, 0.63 mm. Head yellow except clypeus, malar sulcus, a patch on each side of occipital foramen and postocellar bars brown. Antenna ( Fig. 32 ) dark yellow with pedicel and last flagellomere brown. Mesosoma largely yellow with pronotum, anterior margin of mid lobe, a patch on expanded part of each side lobe, apex of axillae, and propodeum laterally brown, about posterior two thirds of notauli and anterior margin of scutellum dark brown. Fore wing, including costal cell, largely infuscate below venation, and darker below base of marginal vein and stigmal vein to more or less give an appearance of 2 cross bands, veins brown. Legs yellow. Metasoma dark yellow with petiole, T1 anteriorly, sides of T1–T4 brown, T5 and T6 largely brown with middle part paler.

Head (Fig. 31) wider than mesosoma. Mandible with three acute teeth. Radicle (R), scape (S), pedicel (P), and 6 flagellomeres with the following ratios of length to width: R: 2.43, S: 4.16, P: 1.53, F1: 2, F2: 2.35, F3: 2.22, F4: 2.26, F5: 2.08 and F6: 2.35; relative lengths of R–F6 to length of F1: R: 0.85, S: 2.8, P: 0.82, F1: 1.00, F2: 1.15, F3: 1.25, F4: 1.3, F5: 1.33, and F6: 1.33; flagellomeres with the following numbers of longitudinal sensilla: F1: 0, F2: 1, F3: 1, F4: 3, F5: 3, F6: 2.

Mesosoma 0.95× as long as metasoma ( Fig. 33 ). Mid lobe of mesoscutum ( Fig. 34 ) with 11 setae, each side lobe of mesoscutum with 3 setae. Distance between placoid sensilla on scutellum 5× maximum width of a sensillum. Distance between anterior pair of scutellar setae 1.16× distance between posterior pair. Fore wing ( Fig. 35 ) 2.61× as long as wide, costal cell with 7 short setae, basal cell with 6 setae, marginal vein with 7 setae along anterior margin; marginal fringe 0.24 × as long as wing width. Mid tibial spur 0.5× as long as corresponding basitarsus, and the latter 0.39× as long as mid tibia. Hind tibia 0.96× as long as mid tibia ( Fig. 37 ).

Metasoma with petiole ( Fig. 38 ) faintly sculptured. T2–T7 with 1+1, 1+1, 1+1, 2+2, 1+4+1 (4 between cercal plates) and 4 setae, respectively. Ovipositor slightly exerted, apparently originating from base of T3, 0.77× as long as mid tibia, and 0.55× as long as mid tibia and basitarsus combined. Third valvula 0.4× as long as second valvifer.

Male. Unknown.

Host. Unknown.

Etymology. Greek: poly = many, much, multi-; Latin: macula = spot, stain; and refers to the many brown patches on the body.

Comments. Encarsia polymacula is similar to E. levadicola Polaszek & Hernández in body colour and antennal structure, but differs from the latter by having the fore wing largely infuscate below the venation (vs completely hyaline), F1 2× as long as wide (vs 1.5×), distance between anterior pair of scutellar setae 1.16× that between posterior pair (vs 0.8–1×), mid tibial spur 0.50× as long as corresponding basitarsus (vs 0.66–0.74×) and ovipositor 0.77× as long as mid tibia (vs 1–1.2×).

Figures

FIGURES 32 – 38. Encarsia polymacula, holotype ♀: 31, head, frontal view; 32, antenna; 33, mesosoma and metasoma; 34, part of mesosoma; 35, fore wing with stigmal vein enlarged; 36, hind wing; 37, legs; 38, sculpture on petiole. Scale bars = 50 µm.