Binodoxys crataegi Davidian & Belokobylskij 2022, sp. nov.

Binodoxys crataegi Davidian, sp. nov.

Figs 1A; 2A, E, F

Type material. Holotype: female, Russia, Saint Petersburg, Pushkin, territory of the All-Russian Institute of Plant Protection (“VIZR”), from adult of Aphis pomi De Geer, 1773 on Crataegus sp., 15.VII.2005 (E. Davidian) (ZISP).

Paratypes: 3 females, with label as in holotype (ZISP).

Description. Female (Fig. 1A). Body length 1.9 mm, fore wing length 1.4 mm, antenna length 1.2 mm.

Head smooth, shining, sparsely setose, transverse in dorsal view, wider than mesosoma at level of tegulae. Eye large, oval, with sparse and short setae on its lower half. Transverse diameter of eye 1.5 × longer than temple (dorsal view). Tentorial index 0.25. POL 1.6 × Od. Clypeus with three long setae, width of clypeus 2.0 × its height. Antenna filiform, with 11 antennomeres, weakly thickened towards apex, covered by semi-erect setae, which are shorter than width of flagellomere. F1 3.0 × longer than its width; F2 2.6 × longer than its width.

Mesosoma. Mesoscutum almost perpendicularly elevated above pronotum, with notauli developed only on its anterior third. Propodeum with large central pentagonal area (Fig. 2E).

Wings. Fore wing hyaline, its length 2.4 × maximum width. Pterostigma 3.5 × longer than its width and 1.7 × longer than metacarp (1-R1). Radial vein (r+3-SR) 2.0 × longer than metacarp (1-R1) and 1.1 × longer than pterostigma.

Metasoma. Petiole (Fig. 2F) with median and lateral carinae reaching level of additional lateral tubercles, length of petiole 2.1 × larger than its width at level of spiracles. Distance between spiracular tubercles 1.1 × longer than distance between spiracular and additional tubercles. Distance between spiracular and additional tubercles almost equal to distance between additional tubercle and apex of petiole. Prongs (Fig. 2A) on posterior margin of last metasomal sternite short, weakly upcurved, its basal width 2.5 × larger than subapical width; prongs as long as ovipositor sheath, its dorsal side with three setae, and apex with two setiform bristles. Ovipositor sheath distinctly concave on ventral margin, with two long setae on wide basal part. Narrow apical part of sheath 1.3 × longer than its wide basal part, and 0.5 × as wide as its basal width.

Colour. Head dark brown, eye black. Three basal antennomeres, clypeus and mandible (except its dark apex), all mouth parts, legs, petiole and apex of metasoma with prongs yellow. Remaining antennomeres, mesosoma and most part of metasoma brown.

Male. Unknown.

Host. Aphis pomi de Geer, 1773 on hawthorn Crataegus sp.

Etymology. Named from the generic name of the hawthorn tree, Crataegus, on which the mummy of aphid host were collected.

Comparative diagnosis. New species differs from the most part of Binodoxys species by the shortened prongs on the posterior margin of the last metasomal sternite and ovipositor sheath. Binodoxys crataegi sp. nov. differs from B. ekaterinaе sp. nov. characterised similar short prongs by having the antenna not widened towards apex and with 11 antennomeres (widened towards apex and with 10 antennomeres in B. ekaterinaе), distinctly separated spiracular and additional tubercles on petiole (these tubercles almost fused in B. ekaterinaе), and prongs less widened basally (distinctly widened basally in B. ekaterinaе).

This new species was reared from Aphis pomi together with Binodoxys angelicae Haliday, 1833 (total 12 females and 28 males). The latter distinctly differs from B. crataegi sp. nov. by the following characters: prongs long, longer than ovipositor sheaths, and with four–five long setae on dorsal margin of prong (short, as long as sheaths and with three setae in B. crataegi), and basal and apical parts of ovipositor sheath about same lengths (apical part longer than basal part in B. crataegi: Fig. 2C).