Plutothrix longigaster Tselikh, Varkonyi & Dale-Skey, 2022

Tselikh, Ekaterina V., Varkonyi, Gergely & Dale-Skey, Natalie, 2022, Review of the genus Plutothrix Foerster, 1856 (Hymenoptera, Pteromalidae) with a key to Palaearctic species, Journal of Hymenoptera Research 93, pp. 1-32 : 1

Plutothrix longigaster Tselikh, Varkonyi & Dale-Skey sp. nov.

Figs 38-46

Comparison.

Plutothrix longigaster is similar to P. kusigematii Kamijo and P. rugosa Kamijo; the differences between these species are given in the key.

Description.

Female. Body length 5.10-6.70 mm. Fore wing length 3.20-3.80 mm.

Head, mesosoma and Mt2-Mt4 metallic bluish-green with diffuse coppery lustre; Mt5-Mt8 brown; ovipositor sheath black. Antenna with scape yellowish-brown, pedicel and flagellum brown. Fore and hind coxae yellowish-brown, mid coxa yellow; all femora, tibiae and tarsi yellow except last segment yellowish-brown. Fore wing with light brownish tint, venation yellowish-brown.

Head in dorsal view 2.10-2.17 × as broad as long and 1.25-1.30 × as broad as mesoscutum; in frontal view 1.05-1.20 × as broad as high. POL 0.89-1.05 × OOL. Eye height 1.38-1.47 × eye length and 2.80-3.00 × as long as malar space. Distance between antennal toruli and lower margin of clypeus 0.6 × distance between antennal toruli and median ocellus. Antenna with scape 0.80-0.85 × as long as eye height and 1.15-1.20 × as long as eye length; pedicel 1.70-1.95 × as long as broad and 0.55-0.65 × as long as F1; combined length of pedicel and flagellum 1.40-1.57 × breadth of head; F1 2.15-2.35 × as long as broad, F3-F6 longer than broad; clava 2.70-2.90 × as long as broad.

Mesosoma 1.65-1.70 × as long as broad. Scutellum weakly and finely reticulate, 1.00-1.05 × as long as broad. Propodeum without nucha, 0.40-0.55 × as long as scutellum; median carina present; sculpture smooth. Metapleuron alutaceous, upper mesepimeron with lower part alutaceous, upper part smooth. Fore wing 2.95-3.25 × as long as maximum width; basal cell, cubital vein and basal vein setose; speculum closed; PST 0.66-0.68 × as long as M, M 0.75-0.80 × as long as PM and 2.0-2.2 × as long as S.

Metasoma 8.50-9.00 × as long as broad, 2.50-2.70 × as long as mesosoma and 1.84-1.94 × as long as mesosoma and head; Mt2 deeply emarginate medially, Mt8 4.40-5.25 × as long as broad. Ovipositor sheath projecting beyond apex of metasoma.

Male unknown.

Etymology.

The name of the species refers to its long gaster (metasoma); noun in apposition.

Material examined.

Holotype female (deposited in ZISP): Russia: Altai Rep., Chemal Vill., 20.VII.2007, coll. S Belokobylskij. Paratypes 1 female, (ZISP): Russia: Amur Reg., 10 km E Arkhary, Arkhara River , 24.VII.2003, coll. S Belokobylskij ; 1 female (ZMUH): Finland: Kb, Ilomantsi , 20.VII.1865, on Populus tremula , coll. Woldstedt , 2466.

Distribution.

Finland (single West Palaearctic record of this species), Russia (Western Siberia, Far East).

Biology.

Unknown.

Figures

Figures 38 - 46. Plutothrix longigaster sp. nov., holotype female (38 - 46) 38 body, lateral view 39 fore wing 40 body, dorsal view 41 antenna 42 metasoma, dorsal view 43 head, frontal view 44 head, dorsal view 45 mesosoma, lateral view 46 mesosoma, dorsal view. Scale bar: 1.7 mm (38).