Homalotylus guangxiensis Zu, 2023

Zu, Guohao, Xue, Hao, Wang, Haiyang, Zhen, Wenquan & Huang, Dawei, 2023, Description of three new species and new distributional data for three species of Homalotylus (Hymenoptera, Encyrtidae) from China, ZooKeys 1184, pp. 273-289 : 273

Homalotylus guangxiensis Zu sp. nov.

Figs 13-18

Type materials.

Holotype. ♀ [on slide], China, Guangxi Province, Qinzhou City, Beibu Gulf University, 21°53'53"N, 108°36'56"E, c. 24 m, 2-11.V.2019, Wen-Quan Zhen, Malaise trapping. Paratypes. 3♀ [on slides], China, Guangxi Province, Qinzhou City, Beibu Gulf University, 21°53'53"N, 108°36'56"E, c. 24 m, 14-31.XII.2019, 1-13.I.2020, Wen-Quan Zhen, Malaise trapping.

Description.

Female. Holotype. Length, 2.11 mm (excluding ovipositor). Head black, with metallic green luster; antennae dark brown, F3 paler apically, F4, F6 and clava white. Mesosoma dark brown with metallic sheen; basal half of tegula white, apical half dark brown; wings mostly hyaline but fore wing weakly infuscate at base and with a distinct, broad brown fascia across wing extending from parastigma, marginal and stigmal veins, setae distad of this uniform in color; legs dark brown, except for apical 1/2 of mid basitarsus and mid tarsus 2-4 white. Metasoma black brown.

Head (Fig. 13 ) with sparse setae on frontovertex, each about as long as diameter of posterior ocellus. Head in front view 1.13 × higher than wide. Frontovertex 0.2 × head width, with distinctly reticulate sculpture. Ocelli forming an angle of about 40°; posterior ocelli very close to eye margin, to occipital margin about 2 × as long as the diameter of anterior ocellus. Malar space 0.23 × eye height. Antennal torulus with its dorsal margins slightly below lower eye margins, and the distance of antennal torulus by about 1.69 × its own height. Antennal (Fig. 14 ) scape slender, 7.11 × as long as wide; pedicel 2.05 × as long as wide, 1.63 × as long as F1; F1 1.33 × as long as wide, F6 slightly wider than long; funicle with linear sensilla on all segments; clava 3-segmented, 2.60 × as long as wide, and longer than F4-F6 combined, apex strongly obliquely truncate, truncate part nearly two thirds of the clava. Measurements (μm): HH, 600; HW, 530; FV, 108; EL, 480; MS, 108; OD, 35; POL, 40; OCL, 58; AOL, 88; length and (width)-radicle, 83; scape, 320 (45); pedicel, 98 (48); F1, 60 (45); F2, 58 (50); F3, 53 (50); F4, 53 (50); F5, 53 (55); F6, 50 (60); clava, 163 (63).

Sculpture (Fig. 15 ) on mesoscutum and scutellum similar to that on head; notaular lines conspicuous and meeting at middle of posterior margin of mesoscutum. Mesoscutum 0.65 × as long as wide; scutellum 0.84 × as long as wide. Fore wing (Fig. 16 ) 2.52 × as long as wide; linea calva interrupted by 2 lines of setae and closed posteriorly by 3 lines of setae; postmarginal vein about as long as stigmal vein. Hind wing (Fig. 17 ) 3.68 × as long as wide. Length of mid tibial spur (Fig. 18 ) 0.39 × of mid tibia and shorter than mid basitarsus. Measurements (μm): FWL, 1325; FWW, 525; SMV, 560; MV, 53; PMV, 90; SV, 88; HWL, 920; HWW, 250; MT, 740; mid tibial spur, 290; mid basitarsus, 310.

Ovipositor (Fig. 15 ) 0.76 × as long as mid tibia, slightly exserted. Measurements (μm): OL, 560.

Male. Unknown.

Host.

Unknown.

Etymology.

The specific name refers to its collecting location.

Diagnosis.

The new species may be distinguished from H. albitarsus Gahan, 1910 and H. agarwali Anis & Hayat, 1998, by the following characters: F4 completely white (basal brown and apical white in H. albitarsus ), hind tarsus brown (1-4 white in H. albitarsus ), mid tibial spur shorter than mid basitarsus (longer in H. albitarsus ), pedicel 2.05 × as long as wide (about 3 × in H. albitarsus ); ovipositor 0.76 × as long as mid tibia (1.03 × in H. agarwali ), F3 dark brown, mixed with white apically (white in H. agarwali ).

Figures

Figures 13 - 18. Homalotylus guangxiensis Zu, sp. nov., holotype female 13 head 14 antenna 15 mesosoma and metasoma 16 fore wing 17 hind wing 18 legs. Scale bars: 100 μm.