Psyllaephagus obliquus Zou & Zhang, 2023

Zou, Boyu, Hu, Hongying, Zhang, Lanwei & Zhang, Yanzhou, 2023, A taxonomic study of Psyllaephagus Ashmead (Hymenoptera, Encyrtidae) from China, ZooKeys 1184, pp. 327-359 : 327

Psyllaephagus obliquus Zou & Zhang sp. nov.

Fig. 14

Type material.

Holotype ♀ [on slide], China - Guizhou, Zunyi, 28.Aug.2017, ex Edentatipsylla shanghaiensis , leg. YZ Zhang and YG Qin (deposited in IZCAS). Paratypes 10♀♀, 2♂♂, same data as holotype.

Diagnosis.

Female. Body length ~ 1.5 mm; all coxae dark brown and hind femora; scape distinctly expand, ~ 3.2 × as long as wide; F6 transverse; clava strongly obliquely truncated at apex (Fig. 14A ); OL ~ 1.4 × MT.

Description.

Female. Body length ~ 1.8 mm, with blue-green sheen; basal ~ 1/2 of tegula yellow, remainder dark brown; scape nearly completely dark brown; pedicel dark brown except apex yellow; funiculus from dark brown to yellow brown; clava yellowish brown; all coxae, hind femur except apices dark brown; wings hyaline, venation brown (Fig. 14B ).

Head with reticulate sculpture, HW ~ 2.2 × the HL in dorsal view, and ~ 2.8 × wide as frontovertex; ocellus forming an angle ~ 100°; OCL ~ 1.2 × diameter of posterior ocellus; OOL ~ 0.4 × diameter of posterior ocellus; POL ~ 3.6 × diameter of posterior ocellus; mandible with two teeth and a broad truncation; upper margin of torulus upper than lower margin of eye; scape distinctly expanded, ~ 3.2 × as long as wide; pedicel ~ 2.7 × as long as wide, approximately as long as F1 and F2 combined; F1 longer than broad, F2-F5 subquadrate, F6 almost wider than long; clava 3-segmented, nearly 2.2 × as long as wide, approximately as long as F4-F6 combined; the apex of clava strongly obliquely truncated (Fig. 14A ), the truncated parts ~ 1/2 clava length. Relative measurements: HW 21; HL 9; FV 7.5; OOL 0.8; POL 7.2; OCL 2.4; SW 2.6; SL 9.

Mesoscutum slightly convex; mesoscutum and scutellum with reticulate sculpture similar to that on frontovertex; MSW ~ 1.4 × MSL; scutellum and mesoscutum dorsally with reticulate sculpture similar to that on frontovertex; marginal vein ~ 1.3 × as long as wide; stigmal vein ~ 4.1 × as long as wide, postmarginal vein ~ 2.0 × as long as wide, PMV ~ 0.3 × of STV; mid tibia spur 0.8 × as long as basitarsus. Relative measurements: FWL 50; FWW 22.

Metasoma approximately as long as mesosoma; cercal plates located in the 1/2 of metasoma; hypopygium reaching ~ 3/4 of metasoma; ovipositor slightly exserted; OL ~ 5.3 × GL, and 1.4 × MT.

Male. Length 1.6-1.8 mm; generally similar to female in body coloration, except the antenna yellow; clava and flagellum have long bristles.

Host.

Edentatipsylla shanghaiensis Li & Chen, 2008 ( Hemiptera : Psyllidae ).

Distribution.

China (Guizhou, Shanghai).

Etymology.

The specific name refers to its strongly obliquely truncated clava.

Comments.

Using the key of Trjapitzin (1989), the species runs to P. stenopsyllae (Tachikawa, 1963), but can be separated from P. stenopsyllae by a combination of the following characters: scape ~ 3.2 × as long as wide (in P. stenopsyllae , scape ~ 3.7 × as long as wide); F2-F5 quadrate, F6 transverse (in P. stenopsyllae , F2-F5 obviously longer than wide, F6 quadrate); clava approximately as long as F4-F6 combined and the apex of clava strongly obliquely truncated (in P. stenopsyllae , clava slightly shorter than F4-F6 combined, and with apex more or less rounded). Psyllaephagus obliquus is similar to P. nipponicus (Ishii, 1928) but can be separated from P. nipponicus by pedicel ~ 2.5 × as long as wide (in P. nipponicus , pedicel ~ 2 × as long as wide); F1 ~ 1.2 × as long as wide (in P. nipponicus , F1 quadrate); metasoma as long as mesosoma (in P. nipponicus , metasoma shorter than mesosoma).

Figures

Figure 14. Psyllaephagus obliquus sp. nov. ♀ A antenna B fore wing C fore leg D mid leg E hind leg F ovipositor.