Oviparosiphum jakovlevi Shaposhnikov, 1979

Żyla, Dagmara, Homan, Agnieszka, Franielczyk, Barbara & Wegierek, Piotr, 2015, Revised concept of the fossil genus Oviparosiphum Shaposhnikov, 1979 with the description of a new genus (Hemiptera, Sternorrhyncha, Aphidomorpha), ZooKeys 483, pp. 9-22 : 12

Taxon classification Animalia Hemiptera Oviparosiphidae

Oviparosiphum jakovlevi Shaposhnikov, 1979 Figs 1, 2, 3, 4

Holotype.

3559/51, Paleontological Institute, Russian Academy of Sciences, Moscow; Bon–Tsagaan locality (Mongolia); Early Cretaceous (Aptian); alate female

Emended diagnosis.

As for genus.

Redescription.

Body (2.49) thick (Figs 1 A–C, 3A). Epicranial suture present (Fig. 4A), connected in the middle of the epicranium with lateral sutures. On head, narrow oblique slats running from front and lateral edges to the posterior part of the head. Diameter of ocelli 0.05; distance between ocelli 0.24. Segment I of antennae (0.05) shorter than segment II (0.08) (Fig. 4B). Secondary rhinaria arranged in transverse rows (Fig. 2A). Praescutum length 0.37; width 0.52. Femora thick. Fore tibia (1.07) about 2.5 times longer than fore femur (0.38). Length of middle tibia 1.02. Middle tarsus (0.26) (Fig. 2B) about one fourth of middle tibia length. Length of hind coxa 0.11. Hind tibia (1.18) about twice as long as the hind femur (0.53). Hind tibiae about half the body length. Fore wing (4.76) (Figs 2D, 3B) longer than body length. Base of the wing narrow. Vein surface scaly (Figs 3C, D). Distance from base of wing to end of pterostigma 3.33. Bases of cubital veins very close to each other. CuA1 (1.46) slightly arched distally, separating from main vein at a 45° angle, slightly shorter than CuA2. Vein CuA2 (1.16) separating from main vein at mid–length between base of the wing and base of vein Rs, at a 70° angle. Vein M with three branches. Base of vein M directed to base of pterostigma, not connected with main vein. Branches of M form a wide (50°) fork. Base of fork of M1+2 and M3+4 behind base of vein Rs. Common stem of vein M (0.89) longer than M1+2 length (0.63) and equal to M3+4 length. Vein Rs (1.67) slightly curved, leaving proximal part of pterostigma at an angle of 25° and running close to it. Pterostigma pointed, short and wide; 3 times longer (0.93) than wide (0.31). Hind wing with two cubital vein. Apical part of abdomen slightly sclerotized (Figs 2C, 4C). Basal diameter of siphunculus 0.13 (Fig. 4D). Diameter of siphunculus aperture 0.10. Ovipositor with valvae I and III well preserved (Fig. 4E). Tergite IX of abdomen clearly visible. Subgenital plate wider than base of ovipositor, 5 times wider than long. In the middle part, its anterior edge forms an indentation reaching half of the length of the plate.