Rovnobrachineura Fedotova et Perkovsky, 2014

Fedotova, Z. A. & Perkovsky, E. E., 2014, New Gall Midges (Diptera, Cecidomyiidae, Brachineurini, Ledomyiini) From The Late Eocene Rovno Amber, Vestnik Zoologii 48 (1), pp. 35-50 : 37

Rovnobrachineura Fedotova et Perkovsky , gen. n.

T y p e s p e c i e s: Rovnobrachineura kiryeyevi Fedotova et Perkovsky , sp. n.

D e s c r i p t i o n ( fig. 1, 1–6 ; 7 , 1–3 ). Male. Body slightly longer than wings. Head is elongate; eyes fused, with narrow bridge, positioned on anterior part of head, occiput wide rounded. Antennae 2+10-segmented, scape narrower than round pedicel. All flagellomeres with distinct very narrow necks, but basal enlargements have different forms. Basal enlargement consists of basal node and narrower slightly swollen or parallelsided distal part: 1st and 2nd flagellomeres slightly narrowed medially; 3rd-7th with round basal node, wide distal part and little neck; 8th-9th with round basal node and narrow distal part; 10th flagellomere strongly narrowed between round basal node and wide oval distal part. Proximal flagellomeres much wider and shorter than distal ones. Flagellomeres with basal and medial whorls of very long setae. Distal part of flagellomeres bears two rings of sensorial filae. Mouthparts much elongate and wide. Palpi 2-segmented, the second one is longer. Wing evenly and very strongly widened distally, vein R 4+5 straight, joining margin almost at wing tip, Rs absent, Cu positioned near margin of wing, not forming a fork. Fore and middle femora and tibiae shorter than hind femur and tibia. Length of hind femur and tibia almost equal. Abdomen slightly swollen near middle (2nd-4th segments) and narrowed distally. Genitalia transversal. Gonocoxite wide, almost straight on outside margin, with dense long setae and almost rectangular lobe on inner side. Gonostylus narrow, slightly curved basally. Cerci very short, far not reaching the apex of gonocoxites, with wide round lobes and triangular excision between its. Parameres or basal enlargement of gonocoxites absent. Hypoproct whole, rounded apically. Aedeagus very wide, much longer than gonocoxites.

C o m p a r i s o n. By the shape of the body, 2+10-segmented antennae, wing venation, long legs and forms of gonocoxites and gonostylus the new genus is closely related to Brachyneurina Mamaev, 1967 ( Mamaev, 1967; Harris, Evans, 1979), but differs from it by the elongated and swollen mouthparts, very narrow eye bridge, 2-segmented palpi, different shape of flagellomeres, vein R 4+5 joining with wing margin at the tip of the wing, very long aedeagus, presence of very dense long setae on the inner side of gonocoxites, and by smaller body size.

E t y m o l o g y. The name is combined from the name of the amber Lagerstätte and name Brachineura . Gender feminine.

Figures

Fig. 1. Rovnobrachineura kiryeyevi, male, holotype (SIZK, N K–3701): 1 — general appearance; 2 — scape, pedicel, flagellomeres 1–2; 3 — flagellomeres 8–10; 4 — flagellomeres 6–7; 5 — mouth parts and palpi; 6 — genitalia dorsally. Scale bars 0.1 mm.

Fig. 2. Brachineura polessica, female, holotype (SIZK, N K–1236): 1 — general appearance; 2 — scape, pedicel, flagellomeres 1–2; 3 — flagellomeres 9–10; 4 — flagellomeres 6–7; 5 — flagellomeres 3–5; 6 — palpus; 7 — middle tarsomeres 3–5; 8 — middle tarsomeres 1–2; 9 — middle tarsomere 1; 10 — middle tarsomere 5; 11 — ovipositor laterally. Scale bars 0.1 mm.

Fig. 3. Popovineura nacta, male, holotype (SIZK, N K–666): 1 — general appearance; 2 — scape, pedicel, flagellomeres 1–2; 3 — flagellomeres 5–6; 4 — flagellomeres 8–11; 5 — palpus; 6 — fore tarsus; 7 — fore tarsomere 5; 8 — genitalia. Scale bars 0.1 mm.

Fig. 4. Nascensluna mellea, female, holotype (SIZK, N K–1601): 1 — general appearance; 2 — flagellomeres 8–10; 3 — flagellomere 5; 4 — ovipositor. Scale bars 0.1 mm.

Fig. 5. Rhizomyia parkalovi, female, holotype (SIZK, N K–7385): 1 — general appearance; 2 — head; 3 — palpus; 4 — flagellomeres 9–10; 5, 6 — tarsomere 1 (variability of shape); 7 — flagellomere 5; 8 — apex of abdomen. Scale bars 0.1 mm.

Fig. 6. Ledomyia olgae, male, holotype (SIZK, N K–3697): 1 — general appearance; 2, 3 — palpi (variability of shape); 4 — flagellomeres 9–11; 5 — flagellomere 5; 6, 7 — genitalia (6 — ventral view,7 — dorsal view).Scale bars 0.1 mm.

Fig. 7. Rovnobrachineura kiryeyevi, male, holotype SIZK, N K–3701 (1–3); Brachineura polessica, female, holotype (SIZK, N K–1236) (4, 5); Rhizomyia parkalovi, female, holotype (SIZK, N K–7385) (6, 7): 1, 4, 6 — head and antenna (1 — ×129; 4 — ×62; 6 — ×117); 2 — genitalia (×283); 3, 5, 7 — general appearance (3 — ×46; 5 — ×29; 7 — ×39).