Urosyntexis undosa Kopylov, sp. nov.

(Fig. 1 D–F)

Etymology. From Latin undosa—undulate.

Material. Holotype PIN 5340 /2170, part and counterpart impressions in mudstone. Imago, female. Well preserved body, antennae (excluding tips), ovipositor, legs (partly); fore wing tip damaged, hind wing incomplete. On the same surface—synfossil imprint of Aphidoidea, PIN 5340 /2071. Khasurty; Russia, Transbaikalia; Lower Cretaceous.

Description. Head, thorax, antennae and ovipositor uniform dark; coxae, trochanters and femora dark, tibiae and tarsi paler; abdomen with traces of color pattern: tergites dark with light spot in the middle; wing veins uniform dark; wing membrane not colored. Antennae filiform, almost not tapered apically; scape small; pedicel slightly swollen, as long as and 1.3 × as wide as 1st flagellomere; flagellomeres cylindric (only 15 flagellomeres preserved), 1st flagellomere 1.8 × as long as and 1.3 × as wide as the 14th. The ratio of lengths of prescutum/longitudinal sulcus between the prescutum and scutellum/scutellum is 1.1/1.0/1.3. Fore wing with Sc displaced basad, distance between Sc and R/Rs furcation 2 × as long as costal space wide; 2r-rs 1.5 × as long as 1r-rs; 1-Rs 3.1 × as long as 1-M; the ratio of lengths of 1r/2r/3r is 1.4/1.0/2.0; cell 1mcu hexagonal, 2-M 2.8 × as long as Rs+M; 1-Cu 0.8 × as long as 2-Cu; 5-M 0.32 × as long as 2m-cu; 2-A 1.8 × as long as 1cu-a. Abdominal tergites undulate; ovipositor full length equals 0.49 × fore wing length, part protruding beyond apex of abdomen equals 0.23 × fore wing length.

Measurements: Body length 9.5 mm; head— 1.3 mm, thorax— 3.4 mm; abdomen— 4.8 mm; ovipositor length: full— 3.8 mm, protruding beyond abdominal apex part— 1.8 mm; fore wing length— 7.9 mm, width— 2.9 mm.

Comparison. The new species differs from other Urosyntexis species in having filiform antenna, short Rs+M, large prescutum and scutellum (unknown for U. drepanura and U. magna).