Rasnitsynaphis gen. n.

Antennae 9-segmented, shorter than hind tibia. Rhinaria arranged in many transverse rows, surrounding antennal segments. Segment IX narrower than other segments of flagellum, blunt at apex, always without rhinaria. Cubitus branches separated. Vein Rs separates from pterostigma in one third of its length. Media originates below the base of pterostigma. Ovipositor present. Siphuncular pores absent.

Named to honour Alexandr P. Rasnitsyn, who is not only eminent researcher, but also a teacher of many paleoentomologists. P.W. is honoured to be one of his students.

As for family.

Body massive. Front edge of head convex. Head with epicranial suture. Rostrum shorter than body, reaching to the middle of abdomen. Antennae longer than one third of the body length but shorter than its half. Antennal segment III 2–4 times as long as wide; segments IV-VIII of the same length or nearly so. Surface of all segments of flagellum sculptured in form of transverse ribs. Rhinaria ellipsoidal, arranged in more or less dense rows which are sometimes joined. Cubital vein CuA1 2.5 times longer than CuA2. Pterostigma big, spindle-shaped, pointed, 3–3.5 times as long as wide. Vein Rs slightly bent at base. Media with two or three branches. Bifurcation of vein M into M1 and M2 or into M1+2 and M3 just beyond the base of vein Rs.

Holotype: PIN 3064/2109(2211); Baissa, Transbaikalia; Zaza Formation, bed 31.

From the Greek term ennea for “nine” and from the Latin term articulum for “segment” in reference to the 9-segmented antennae.

Antennae rather long; segment III three times as long as wide;segments IV–VIII of about the same length, rectangular, longer than wide. Media with three branches.

Length of the body 2.1 (Fig. 1c). Width of head 0.43 (Fig. 1a). Lateral sutures join in the middle of epicranium in the four fifth of the head length. On the dorsal side of head capsule there are three diagonal strips, running from the middle part of epicranium to the frontolateral edge of head. The distance between ocelli (situated on the back of head) 0.27. Length of the apical segment of rostrum 0.18 (Fig 1e). Antennae 0.93 long, ca. 0.8 of thorax width (Figs 1b, d). Length of antennal segments: I 0.06; II 0.08; III 0.23; each of IV–VII 0.09; VIII 0.08; IX 0.07. Antennal segment III with about 17 rows of rhinaria, with at most 8 rhinaria arranged in one row. Segments IV–VIII at most with 7 rows of rhinaria. Tibia of fore legs 0.75 long, middle tibiae 0.83 to 0.86. Mesothoracic sternite 0.93 wide, 0.53 long. Fore wings about 3.8 long. The distance from the base of the wing to the end of pterostigma 2.8. Distance between bases of cubital veins CuA1 & CuA2 0.14. The length of M1+2 more or less equals the length of the common stem of M. The posterior part of abdomen strongly sclerotized (Fig. 1f).

Holotype: PIN 3064/2209; Baissa, Transbaikalia; Zaza Formation, bed 31.

From the Latin term coniunctus for “joined” in reference to the joined rows of rhinaria.

Antenna rather long; segment III four times as long as wide; segments IV–VIII of about the same length, rectangular, longer than wide.

Length of the body about 2.4 (Fig. 2b). Head with epicranial suture. Antennae 0.88 long, about 2/3 of thorax height (Figs 2a, c). Length of antennal segments: II 0.12; III 0.24; IV 0.09; V 0.08; each of VI–VII 0.09; VIII 0.08; IX 0.07 to 0.08. Antennal segment III with 11 rows of rhinaria, with at most 7 rhinaria arranged in one row. Segments IV–VIII at most with 6 rows of rhinaria. Femur of fore legs 0.74 long, tibia 1.06. Middle tibia 1.14 long. Hind femur 0.87 long, tibia 1.34. The second segment of hind leg tarsus 0.24 (Fig. 2d). The distance between bases of cubital veins CuA1 & CuA2 0.13.

Holotype: 3064/2279; Baissa, Transbaikalia; Zaza Formation, bed 31.

From the Latin term quadratus for “square” in reference to the square shape of antennal segments IV–VII.

Antennae quite short; segment III two times as long as wide; segments IV–VII of the same length, square, as long as wide. Media with two branches.

Length of the body 2.0 (Fig. 3b). Length of head 0.28. Head with lateral sutures. Length of the apical segment of rostrum 0.14 (Fig. 3c). Antennae 0.71 long, about 1/2 of thorax height (Fig. 3a, b). Length of antennal segments: I 0.06; II 0.07; III 0.16; each of IV–IX 0.06. Antennal segment III with about 9 rows of rhinaria, with at most 8 rhinaria arranged in one row. Segments IV–VIII at most with 4 rows of rhinaria. Femur of middle legs 0.54 long, tibia 0.73. Hind femur 0.57 long. Mesothoracic sternite 0.49 long. The distance from the base of the wing to the end of pterostigma 2.7. The distance between bases of cubital veins CuA1 & CuA2 0.11. The posterior part of abdomen weakly sclerotized.