Psyllaephagus arenarius Trjapitzin, 1967

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 arenarius Trjapitzin, 1967

Fig. 1

Psyllaephagus arenarius Trjapitzin, 1967: 192. Holotype ♀, Russia (ZISP), not examined.

Psyllaephagus arenarius Trjapitzin, 1968: 96-97, 1978: 301, 1981: 14-16; 1989: 256; Zhang et al. 2017: 842-846.

Material examined.

China - Ningxia • 13♀♀, 12♂♂, Zhongwei , 09.Jul.2016, leg. PX Wu , ex. Bactericera gobica on Lycium barbarum ; Zhonwei , 17.Aug.2016, PX Wu leg. , ex. Bactericera gobica on Lycium barbarum ; 22♀♀, 37♂♂, 11♀♀, Jixian , 17.Apr.2017, leg. X Zhang ; Shandong • 10♀♀, 3♂♂, Junan , 11.Jun.2018, leg. YZ Zhang.

Diagnosis.

Female. Body length ~ 1.3 mm; mid and hind coxae dark brown, basal ~ 2/3 of hind femur dark brown; F1-F5 usually a little longer than wide, F6 quadrate (Fig. 1A ); ovipositor not or hardly exserted (Fig. 1H ), OL ~ 1.1 × as long as MT.

Description.

Female. Body length 1.2-1.6 mm. Frontovertex and scrobe with blue-violet sheen; mesoscutum, axillae metallic green; scutellum with a golden-green sheen; metasoma with metallic green sheen; scape and pedicel dark brown, but apex of 1/5 scape and 1/3 pedicel paler; funicle and clava yellowish brown (Fig. 1A ); tegula pale yellow, except apex dark brown; legs yellow, except basal 1/4 of fore coxa brown, mid and hind coxae dark brown, basal 2/3 of hind femur dark brown (Fig. 1E-G ); wings hyaline, venation brown (Fig. 1B ).

Head with reticulate sculpture; HW 2.1 × HL in dorsal view, and ~ 3.0 × FV; ocelli form acute angle of slightly <90°; OCL ~ 1.7 × diameter of posterior ocellus; OOL ~ 1.0 × diameter of posterior ocellus; POL ~ 2.7 × diameter of posterior ocellus; mandible with one tooth and a broad truncation (Fig. 1C ); upper margin of torulus below level of lower eye margin; antenna with scape ~ 4 × as long as wide; pedicel ~ 1.9 × as long as wide; F1-F5 longer than broad, F6 subquadrate; clava 3-segmented, as long as F4-F6 combined, nearly 2.2 × as long as wide with apex rounded. Relative measurements: HW 22; HL 10.4; FV 7.3; OOL 2; POL 5.4; OCL 3.4; SW 2.5; SL 10.5.

Mesoscutum slightly convex; mesoscutum and scutellum with similar reticulate sculpture to that on frontovertex (Fig. 1D ); pronotum ~ 0.25 × as long as wide; MSW ~ 1.6 × MSL; scutellum ~ 1.5 × as long as wide; fore wing ~ 2.3 × as long as wide; marginal vein punctiform; stigmal vein ~ 5.5 × as long as wide, STV ~ 2.5 × PMV; basal cell almost bare; mid tibial spur ~ 0.7 × as long as basitarsus. Relative measurements: FWL 35.5; FWW 19.7.

Metasoma ~ 0.8 × as long as mesosoma; cercal plates located in the 1/2 basal of metasoma; hypopygium reaching 2/3 of metasoma; ovipositor not exserted (Fig. 1H ), OL ~ 5.0 × GL, and 1.1 × MT.

Male. Length 1.0-1.3 mm; generally similar to female except antenna and genitalia. All funicle segments longer than broad and clothed with long setae, usually longer than funicle segments

Hosts.

Acaerus turkestanicus Low, 1881 ( Hemiptera : Psyllidae ), Bactericera gobica Loginova, 1972 ( Hemiptera : Triozidae ).

Distribution.

China (Ningxia, Shandong, Tianjin); other countries: Russia (Tajikistan).

Comments.

The specimens studied here agree well with the original description of P. arenarius , except the length of clava is slightly shorter than F3-F6 combined; in the original description, the clava is approximately as long as F3-F6 combined.

Figures

Figure 1. Psyllaephagus arenarius ♀ A antenna B mandible C fore wing D mesonotum E fore leg F mid leg G hind leg H ovipositor.